Over the last few monsoons I lived with the dread that the rain would
eventually find its ways through my leaky terrace roof and destroy my books.
Last August my fears came true when I woke up in the middle of the night to
see my room flooded and water leaking from the roof and through the walls.
Much of the night was spent rescuing the books and shifting them to a dry
room. While timing and speed were essential to the task at hand they were also
the key hazards navigating a slippery floor with books perched till one’s
neck. At the end of the rescue mission, I sat alone, exhausted amongst a
mountain of books assessing the damage that had been done, but also having
found books I had forgotten or had not seen in years; books which I had
thought had been permanently borrowed by others or misplaced found their way
back as I set many aside in a kind of ritual of renewed commitment.
Sorting the badly damaged from the mildly wet, I could not help but think
about the fragile histories of books from the library of Alexandria to the
great Florence flood of 1966. It may have seemed presumptuous to move from the
precarity of one’s small library and collection to these larger events, but is
there any other way in which one experiences earth-shattering events if not
via a microcosmic filtering through one’s own experiences? I sent a distressed
email to a friend Sandeep a committed bibliophile and book collector with a
fantastic personal library, who had also been responsible for many of my new
acquisitions. He wrote back on August 17, and I quote an extract of the email:
> Dear Lawrence
>
> I hope your books are fine. I feel for you very deeply, since my nightmares
about the future all contain as a key image my books rotting away under a
steady drip of grey water. Where was this leak, in the old house or in the
new? I spent some time looking at the books themselves: many of them I greeted
like old friends. I see you have Lewis Hyde’s _Trickster Makes the World_ and
Edward Rice’s _Captain Sir Richard Francis Burton_ in the pile: both top-class
books. (Burton is a bit of an obsession with me. The man did and saw
everything there was to do and see, and thought about it all, and wrote it all
down in a massive pile of notes and manuscripts. He squirrelled a fraction of
his scholarship into the tremendous footnotes to the Thousand and One Nights,
but most of it he could not publish without scandalising the Victorians, and
then he died, and his widow made a bonfire in the backyard, and burnt
everything because she disapproved of these products of a lifetime’s labors,
and of a lifetime such as few have ever had, and no one can ever have again. I
almost hope there is a special hell for Isabel Burton to burn in.)
Moving from one’s personal pile to the burning of the work of one of the
greatest autodidacts of the nineteenth century and back it was strangely
comforting to be reminded that libraries—the greatest of time machines
invented—were testimonies to both the grandeur and the fragility of
civilizations. Whenever I enter huge libraries it is with a tingling sense of
excitement normally reserved for horror movies, but at the same time this same
sense of awe is often accompanied by an almost debilitating sense of what it
means to encounter finitude as it is dwarfed by centuries of words and
scholarship. Yet strangely when I think of libraries it is rarely the New York
public library that comes to mind even as I wish that we could have similar
institutions in India. I think instead of much smaller collections—sometimes
of institutions but often just those of friends and acquaintances. I enjoy
browsing through people’s bookshelves, not just to discern their reading
preferences or to discover for myself unknown treasures, but also to take
delight in the local logic of their library, their spatial preferences and to
understand the order of things not as a global knowledge project but as a
personal, often quirky rationale.
[ ](//images.e-flux-systems.com/2012_09_library-of-congress.jpg,2000 "Machine
room for book transportation at the Library of Congress, early 20th century.")
Machine room for book transportation at the Library of Congress, early 20th
century.
Like romantic love, bibliophilia is perhaps shaped by one’s first love. The
first library that I knew intimately was a little six by eight foot shop
hidden in a by-lane off one of the busiest roads in Bangalore, Commercial
street. From its name to what it contained, Mecca stores could well have been
transported out of an Arabian nights tale. One side of the store was lined
with plastic ware and kitchen utensils of every shape and size while the other
wall was piled with books, comics, and magazines. From my eight-year-old
perspective it seemed large enough to contain all the knowledge of the world.
I earned a weekly stipend packing noodles for an hour every day after school
in the home shop that my parents ran, which I used to either borrow or buy
second hand books from the store. I was usually done with them by Sunday and
would have them reread by Wednesday. The real anguish came in waiting from
Wednesday to Friday for the next set. After finally acquiring a small
collection of books and comics myself I decided—spurred on by a fatal
combination of entrepreneurial enthusiasm and a pedantic desire to educate
others—to start a small library myself. Packing my books into a small aluminum
case and armed with a makeshift ledger, I went from house to house convincing
children in the neighborhood to forgo twenty-five paisa in exchange for a book
or comic with an additional caveat that they were not to share them with any
of their friends. While the enterprise got off to a reasonable start it soon
met its end when I realized that despite my instructions, my friends were
generously sharing the comics after they were done with them, which thereby
ended my biblioempire ambitions.
Over the past few years the explosion of ebook readers and consequent rise in
the availability of pirated books have opened new worlds to my booklust.
[Library.nu](library.nu), which began as gigapedia, suddenly made the idea of
the universal library seem like reality. By the time it shut down in February
2012 the library had close to a million books and over half a million active
users. Bibliophiles across the world were distraught when the site was shut
down and if it were ever possible to experience what the burning of the
library of Alexandria must have felt it was that collective ache of seeing the
closure of [library.nu.](library.nu)
What brings together something as monumental as the New York public library, a
collective enterprise like [library.nu](library.nu) and Mecca stores if not
the word library? As spaces they may have little in common but as virtual
spaces they speak as equals even if the scale of their imagination may differ.
All of them partake of their share in the world of logotopias. In an
exhibition designed to celebrate the place of the library in art, architecture
and imagination the curator Sascha Hastings coined the term logotopia to
designate “word places”—a happy coincidence of architecture and language.
There is however a risk of flattening the differences between these spaces by
classifying them all under a single utopian ideal of the library. Imagination
after all has a geography and physiology and requires our alertness to these
distinctions. Lets think instead of an entire pantheon (both of spaces as well
as practices) that we can designate as shadow libraries (or shadow logotopias
if you like) which exist in the shadows cast by the long history of monumental
libraries. While they are often dwarfed by the idea of the library, like the
shadows cast by our bodies, sometimes these shadows surge ahead of the body.
[ ](//images.e-flux-systems.com/2012_09_london-blitz-WEB.jpg,2000 "The London
Library after the Blitz, c. 1940.")
The London Library after the Blitz, c. 1940.
At the heart of all libraries lies a myth—that of the burning of the library
of Alexandria. No one knows what the library of Alexandria looked like or
possesses an accurate list of its contents. What we have long known though is
a sense of loss. But a loss of what? Of all the forms of knowledge in the
world in a particular time. Because that was precisely what the library of
Alexandria sought to collect under its roofs. It is believed that in order to
succeed in assembling a universal library, King Ptolemy I wrote “to all the
sovereigns and governors on earth” begging them to send to him every kind of
book by every kind of author, “poets and prose-writers, rhetoricians and
sophists, doctors and soothsayers, historians, and all others too.” The king’s
scholars had calculated that five hundred thousand scrolls would be required
if they were to collect in Alexandria “all the books of all the peoples of the
world.”1
What was special about the Library of Alexandria was the fact that until then
the libraries of the ancient world were either private collections of an
individual or government storehouses where legal and literary documents were
kept for official reference. By imagining a space where the public could have
access to all the knowledge of the world, the library also expressed a new
idea of the human itself. While the library of Alexandria is rightfully
celebrated, what is often forgotten in the mourning of its demise is another
library—one that existed in the shadows of the grand library but whose
whereabouts ensured that it survived Caesar’s papyrus destroying flames.
According to the Sicilian historian Diodorus Siculus, writing in the first
century BC, Alexandria boasted a second library, the so-called daughter
library, intended for the use of scholars not affiliated with the Museion. It
was situated in the south-western neighborhood of Alexandria, close to the
temple of Serapis, and was stocked with duplicate copies of the Museion
library’s holdings. This shadow library survived the fire that destroyed the
primary library of Alexandria but has since been eclipsed by the latter’s
myth.
Alberto Manguel says that if the library of Alexandria stood tall as an
expression of universal ambitions, there is another structure that haunts our
imagination: the tower of Babel. If the library attempted to conquer time, the
tower sought to vanquish space. He says “The Tower of Babel in space and the
Library of Alexandria in time are the twin symbols of these ambitions. In
their shadow, my small library is a reminder of both impossible yearnings—the
desire to contain all the tongues of Babel and the longing to possess all the
volumes of Alexandria.”2 Writing about the two failed projects Manguel adds
that when seen within the limiting frame of the real, the one exists only as
nebulous reality and the other as an unsuccessful if ambitious real estate
enterprise. But seen as myths, and in the imagination at night, the solidity
of both buildings for him is unimpeachable.3
The utopian ideal of the universal library was more than a question of built
up form or space or even the possibility of storing all of the knowledge of
the world; its real aspiration was in the illusion of order that it could
impose on a chaotic world where the lines drawn by a fine hairbrush
distinguished the world of animals from men, fairies from ghosts, science from
magic, and Europe from Japan. In some cases even after the physical structure
that housed the books had crumbled and the books had been reduced to dust the
ideal remained in the form of the order imagined for the library. One such
residual evidence comes to us by way of the _Pandectae_ —a comprehensive
bibliography created by Conrad Gesner in 1545 when he feared that the Ottoman
conquerors would destroy all the books in Europe. He created a bibliography
from which the library could be built again—an all embracing index which
contained a systematic organization of twenty principal groups with a matrix
like structure that contained 30,000 concepts.4
It is not surprising that Alberto Manguel would attempt write a literary,
historical and personal history of the library. As a seventeen-year-old man in
Buenos Aries, Manguel read for the blind seer Jorge Luis Borges who once
imagined in his appropriately named story—The Tower of Babel—paradise as a
kind of library. Modifying his mentor’s statement in what can be understood as
a gesture to the inevitable demands of the real and yet acknowledging the
possible pleasures of living in shadows, Manguel asserts that sometimes
paradise must adapt itself to suit circumstantial requirements. Similarly
Jacques Rancière writing about the libraries of the working class in the
eighteenth century tells us about Gauny a joiner and a boy in love with
vagrancy and botany who decides to build a library for himself. For the sons
of the poor proletarians living in Saint Marcel district, libraries were built
only a page at a time. He learnt to read by tracing the pages on which his
mother bought her lentils and would be disappointed whenever he came to the
end of a page and the next page was not available, even though he urged his
mother to buy her lentils from the same grocer. 5
[ ](//images.e-flux-systems.com/2012_09_DGF-D-Tropics-detail-hi-res-
WEB.jpg,2000 "Dominique Gonzalez-Foerster, Chronotopes & Dioramas , 2009.
Diorama installation at The Hispanic Society of America, New York.")
Dominique Gonzalez-Foerster, _Chronotopes & Dioramas_, 2009. Diorama
installation at The Hispanic Society of America, New York.
Is the utopian ideal of the universal library as exemplified by the library of
Alexandria or modernist pedagogic institutions of the twentieth century
adequate to the task of describing the space of the shadow library, or do we
need a different account of these other spaces? In an era of the ebook reader
where the line between a book and a library is blurred, the very idea of a
library is up for grabs. It has taken me well over two decades to build a
collection of a few thousand books while around two hundred thousand books
exist as bits and bytes on my computer. Admittedly hard drives crash and data
is lost, but is that the same threat as those of rain or fire? Which then is
my library and which its shadow? Or in the spirit of logotopias would it be
more appropriate to ask the spatial question: where is the library?
If the possibility of having 200,000 books on one’s computer feels staggering
here is an even more startling statistic. The Library of Congress which is the
largest library in the world with holdings of approximately thirty million
books, which would—if they were piled on the floor—cover 364 kilometers could
potentially fit into an SD card. It is estimated that by 2030 an ordinary SD
card will have the capacity of storing up to 64 TB and assuming each book were
digitized at an average size of 1MB it would technically be possible to fit
two Libraries of Congress in one’s pocket.
It sounds like science fiction, but isn’t it the case that much of the science
fiction of a decade ago finds itself comfortably within the weaves of everyday
life. How do we make sense of the future of the library? While it may be
tempting to throw our hands up in boggled perplexity about what it means to be
able to have thirty million books lets face it: the point of libraries have
never been that you will finish what’s there. Anyone with even a modest book
collection will testify to the impossibility of ever finishing their library
and if anything at all the library stands precisely at the cusp of our
finitude and our infinity. Perhaps that is what Borges—the consummate mixer of
time and space—meant when he described paradise as a library, not as a spatial
idea but a temporal one: that it was only within the confines of infinity that
one imagine finishing reading one’s library. It would therefore be more
interesting to think of the shadow library as a way of thinking about what it
means to dwell in knowledge. While all our aspirations for a habitat should
have a utopian element to them, lets face it, utopias have always been
difficult spaces to live in.
In contrast to the idea of utopia is heterotopia—a term with its origins in
medicine (referring to an organ of the body that had been dislodged from its
usual space) and popularized by Michel Foucault both in terms of language as
well as a spatial metaphor. If utopia exists as a nowhere or imaginary space
with no connection to any existing social spaces, then heterotopias in
contrast are realities that exist and are even foundational, but in which all
other spaces are potentially inverted and contested. A mirror for instance is
simultaneously a utopia (placeless place) even as it exists in reality. But
from the standpoint of the mirror you discover your absence as well. Foucault
remarks, “The mirror functions as a heterotopia in this respect: it makes this
place that I occupy at the moment when I look at myself in the glass at once
absolutely real, connected with all the space that surrounds it, and
absolutely unreal, since in order to be perceived it has to pass through this
virtual point which is over there.”6
In _The Order of Things_ Foucault sought to investigate the conceptual space
which makes the order of knowledge possible; in his famed reading of Borges’s
Chinese encyclopedia he argues that the impossibility involved in the
encyclopedia consists less in the fantastical status of the animals and their
coexistence with real animals such as (d) sucking pigs and (e) sirens, but in
where they coexist and what “transgresses the boundaries of all imagination,
of all possible thought, is simply that alphabetical series (a, b, c, d) which
links each of those categories to all the others.” 7 Heterotopias destabilize
the ground from which we build order and in doing so reframe the very
epistemic basis of how we know.
Foucault later developed a greater spatial understanding of heterotopias in
which he uses specific examples such as the cemetery (at once the space of the
familiar since everyone has someone in the cemetery and at the heart of the
city but also over a period of time the other city, where each family
possesses its dark resting place).8 Indeed, the paradox of heterotopias is
that they are both separate from yet connected to all other spaces. This
connectedness is precisely what builds contestation into heterotopias.
Imaginary spaces such as utopias exist completely outside of order.
Heteretopias by virtue of their connectedness become sites in which epistemes
collide and overlap. They bring together heterogeneous collections of unusual
things without allowing them a unity or order established through resemblance.
Instead, their ordering is derived from a process of similitude that produces,
in an almost magical, uncertain space, monstrous combinations that unsettle
the flow of discourse.
If the utopian ideal of the library was to bring together everything that we
know of the world then the length of its bookshelves was coterminous with the
breadth of the world. But like its predecessors in Alexandria and Babel the
project is destined to be incomplete haunted by what it necessarily leaves out
and misses. The library as heterotopia reveals itself only through the
interstices and lays bare the fiction of any possibility of a coherent ground
on which a knowledge project can be built. Finally there is the question of
where we stand once the grounds that we stand on itself has been dislodged.
The answer from my first foray into the tiny six by eight foot Mecca store to
the innumerable hours spent on [ library.nu]( library.nu) remains the same:
the heterotopic pleasure of our finite selves in infinity.
×
This essay is a part of a work I am doing for an exhibition curated by Raqs
Media Collective, Sarai Reader 09. The show began on August 19, 2012, with a
deceptively empty space containing only the proposal, with ideas for the
artworks to come over a period of nine months. See .
**Lawrence Liang** is a researcher and writer based at the Alternative Law
Forum, Bangalore. His work lies at the intersection of law and cultural
politics, and has in recent years been looking at question of media piracy. He
is currently finish a book on law and justice in Hindi cinema.
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continues to retreat, while on the other, a more immediate crisis of faith has
accompanied the widespread sense of diminishing economic prospects felt in so
many places. Not to mention...
Over the last few monsoons I lived with the dread that the rain would
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Much of the night was spent rescuing the books and shifting them to a dry
room. While timing and speed were essential to the task at hand they were also
the key hazards navigating a slippery floor...
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## [There’s Nothing to See Here: Erasing the
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good at her job. In 1951 she started erasing her typing mistakes with a white
tempera paint solution she mixed in her kitchen blender. She called her
invention Mistake Out and began distributing small green bottles of it to her
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## [The Last Pictures: Interview with Trevor Paglen](/journal/37/61238/the-
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## [Breaking the Contract](/journal/37/61241/breaking-the-contract/)
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Shadow Libraries
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Notes - Shadow Libraries
1
Esther Shipman and Sascha Hastings eds., _Logotopia: The Library in
Architecture Art and the Imagination,_ (Cambridge Galleries: Abc Art Books
Canada, 2008).
Go to Text
2
Alberto Manguel, “My Library” in Hastings and Shipman eds. _Logotopia, The
Library in Art and Architecture and the Imagination, (Cambridge Galleries: ABC
Art Books Canada, 2008)._
Go to Text
3
Alberto Manguel, _The Library at Night_ , (Yale University Press 2009).
Go to Text
4
Ray Hastings and Esther Shipman, eds. _Logotopia: The Library in Architecture
Art and the Imagination_. Cambridge Galleries / ABC Art Books Canada, 2008.
Go to Text
5
Jacques Rancière, _The Nights of Labour: The Workers’ Dream in Nineteenth
Century France,_ (Philadelphia: Temple University Press, 1991).
Go to Text
6
Michel Foucault, “Different Spaces,” in _Aesthetics, Method, Epistemology_ ,
ed. James D. Faubion (New York: The New Press, 1998), 179; For Foucault on
language and heterotopias see _The Order of Things: An Archaeology of the
Human Sciences,_ (New York: Pantheon, 1970).
Go to Text
7
Ibid, xv.
Go to Text
8
In Foucault, “Different Spaces,” which was presented as a lecture to the
_Architecture Studies Circle_ in 1967, a few years after the writing of _The
Order of Things_.
Go to Text
Esther Shipman and Sascha Hastings eds., _Logotopia: The Library in
Architecture Art and the Imagination,_ (Cambridge Galleries: Abc Art Books
Canada, 2008).
Alberto Manguel, “My Library” in Hastings and Shipman eds. _Logotopia, The
Library in Art and Architecture and the Imagination, (Cambridge Galleries: ABC
Art Books Canada, 2008)._
Alberto Manguel, _The Library at Night_ , (Yale University Press 2009).
Ray Hastings and Esther Shipman, eds. _Logotopia: The Library in Architecture
Art and the Imagination_. Cambridge Galleries / ABC Art Books Canada, 2008.
Jacques Rancière, _The Nights of Labour: The Workers’ Dream in Nineteenth
Century France,_ (Philadelphia: Temple University Press, 1991).
Michel Foucault, “Different Spaces,” in _Aesthetics, Method, Epistemology_ ,
ed. James D. Faubion (New York: The New Press, 1998), 179; For Foucault on
language and heterotopias see _The Order of Things: An Archaeology of the
Human Sciences,_ (New York: Pantheon, 1970).
Ibid, xv.
In Foucault, “Different Spaces,” which was presented as a lecture to the
_Architecture Studies Circle_ in 1967, a few years after the writing of _The
Order of Things_.
Medak, Sekulic & Mertens
Book Scanning and Post-Processing Manual Based on Public Library Overhead Scanner v1.2
2014
PUBLIC LIBRARY
&
MULTIMEDIA INSTITUTE
BOOK SCANNING & POST-PROCESSING MANUAL
BASED ON PUBLIC LIBRARY OVERHEAD SCANNER
Written by:
Tomislav Medak
Dubravka Sekulić
With help of:
An Mertens
Introduction
3
I. Photographing a printed book
7
I. Getting the image files ready for post-processing
11
III. Transformation of source images into .tiffs
13
IV. Optical character recognition
16
V. Creating a finalized e-book file
16
VI. Cataloging and sharing the e-book
16
Quick workflow reference for scanning and post-processing
18
References
22
INTRODUCTION:
BOOK SCANNING - FROM PAPER BOOK TO E-BOOK
Initial considerations when deciding on a scanning setup
Book scanning tends to be a fragile and demanding process. Many factors can go wrong or produce
results of varying quality from book to book or page to page, requiring experience or technical skill
to resolve issues that occur. Cameras can fail to trigger, components to communicate, files can get
corrupted in the transfer, storage card doesn't get purged, focus fails to lock, lighting conditions
change. There are trade-offs between the automation that is prone to instability and the robustness
that is prone to become time consuming.
Your initial choice of book scanning setup will have to take these trade-offs into consideration. If
your scanning community is confined to your hacklab, you won't be risking much if technological
sophistication and integration fails to function smoothly. But if you're aiming at a broad community
of users, with varying levels of technological skill and patience, you want to create as much timesaving automation as possible on the condition of keeping maximum stability. Furthermore, if the
time of individual members of your scanning community can contribute is limited, you might also
want to divide some of the tasks between users and their different skill levels.
This manual breaks down the process of digitization into a general description of steps in the
workflow leading from the printed book to a digital e-book, each of which can be in a concrete
situation addressed in various manners depending on the scanning equipment, software, hacking
skills and user skill level that are available to your book scanning project. Several of those steps can
be handled by a single piece of equipment or software, or you might need to use a number of them your mileage will vary. Therefore, the manual will try to indicate the design choices you have in the
process of planning your workflow and should help you make decisions on what design is best for
you situation.
Introducing book scanner designs
The book scanning starts with the capturing of digital image files on the scanning equipment. There
are three principle types of book scanner designs:
flatbed scanner
single camera overhead scanner
dual camera overhead scanner
Conventional flatbed scanners are widely available. However, given that they require the book to be
spread wide open and pressed down with the platen in order to break the resistance of the book
binding and expose sufficiently the inner margin of the text, it is the most destructive approach for
the book, imprecise and slow.
Therefore, book scanning projects across the globe have taken to custom designing improvised
setups or scanner rigs that are less destructive and better suited for fast turning and capturing of
pages. Designs abound. Most include:
•
•
•
one or two digital photo cameras of lesser or higher quality to capture the pages,
transparent V-shaped glass or Plexiglas platen to press the open book against a V-shape
cradle, and
a light source.
The go-to web resource to help you make an informed decision is the DIY book scanning
community at http://diybookscanner.org. A good place to start is their intro
(http://wiki.diybookscanner.org/ ) and scanner build list (http://wiki.diybookscanner.org/scannerbuild-list ).
The book scanners with a single camera are substantially cheaper, but come with an added difficulty
of de-warping the distorted page images due to the angle that pages are photographed at, which can
sometimes be difficult to correct in the post-processing. Hence, in this introductory chapter we'll
focus on two camera designs where the camera lens stands relatively parallel to the page. However,
with a bit of adaptation these instructions can be used to work with any other setup.
The Public Library scanner
In the focus of this manual is the scanner built for the Public Library project, designed by Voja
Antonić (see Illustration 1). The Public Library scanner was built with the immediate use by a wide
community of users in mind. Hence, the principle consideration in designing the Public Library
scanner was less sophistication and more robustness, facility of use and distributed process of
editing.
The board designs can be found here: http://www.memoryoftheworld.org/blog/2012/10/28/ourbeloved-bookscanner. The current iterations are using two Canon 1100 D cameras with the kit lens
Canon EF-S 18-55mm 1:3.5-5.6 IS. Cameras are auto-charging.
Illustration 1: Public Library Scanner
The scanner operates by automatically lowering the Plexiglas platen, illuminating the page and then
triggering camera shutters. The turning of pages and the adjustments of the V-shaped cradle holding
the book are manual.
The scanner is operated by a two-button controller (see Illustration 2). The upper, smaller button
breaks the capture process in two steps: the first click lowers the platen, increases the light level and
allows you to adjust the book or the cradle, the second click triggers the cameras and lifts the platen.
The lower button has
two modes. A quick
click will execute the
whole capture process in
one go. But if you hold
it pressed longer, it will
lower the platen,
allowing you to adjust
the book and the cradle,
and lift it without
triggering cameras when
you press again.
Illustration 2: A two-button controller
More on this manual: steps in the book scanning process
The book scanning process in general can be broken down in six steps, each of which will be dealt
in a separate chapter in this manual:
I. Photographing a printed book
I. Getting the image files ready for post-processing
III. Transformation of source images into .tiffs
IV. Optical character recognition
V. Creating a finalized e-book file
VI. Cataloging and sharing the e-book
A step by step manual for Public Library scanner
This manual is primarily meant to provide a detailed description and step-by-step instructions for an
actual book scanning setup -- based on the Voja Antonić's scanner design described above. This is a
two-camera overhead scanner, currently equipped with two Canon 1100 D cameras with EF-S 1855mm 1:3.5-5.6 IS kit lens. It can scan books of up to A4 page size.
The post-processing in this setup is based on a semi-automated transfer of files to a GNU/Linux
personal computer and on the use of free software for image editing, optical character recognition
and finalization of an e-book file. It was initially developed for the HAIP festival in Ljubljana in
2011 and perfected later at MaMa in Zagreb and Leuphana University in Lüneburg.
Public Library scanner is characterized by a somewhat less automated yet distributed scanning
process than highly automated and sophisticated scanner hacks developed at various hacklabs. A
brief overview of one such scanner, developed at the Hacker Space Bruxelles, is also included in
this manual.
The Public Library scanning process proceeds thus in following discrete steps:
1. creating digital images of pages of a book,
2. manual transfer of image files to the computer for post-processing,
3. automated renaming of files, ordering of even and odd pages, rotation of images and upload to a
cloud storage,
4. manual transformation of source images into .tiff files in ScanTailor
5. manual optical character recognition and creation of PDF files in gscan2pdf
The detailed description of the Public Library scanning process follows below.
The Bruxelles hacklab scanning process
For purposes of comparison, here we'll briefly reference the scanner built by the Bruxelles hacklab
(http://hackerspace.be/ScanBot). It is a dual camera design too. With some differences in hardware functionality
(Bruxelles scanner has automatic turning of pages, whereas Public Library scanner has manual turning of pages), the
fundamental difference between the two is in the post-processing - the level of automation in the transfer of images
from the cameras and their transformation into PDF or DjVu e-book format.
The Bruxelles scanning process is different in so far as the cameras are operated by a computer and the images are
automatically transferred, ordered and made ready for further post-processing. The scanner is home-brew, but the
process is for advanced DIY'ers. If you want to know more on the design of the scanner, contact Michael Korntheuer at
contact@hackerspace.be.
The scanning and post-processing is automated by a single Python script that does all the work
http://git.constantvzw.org/?
p=algolit.git;a=tree;f=scanbot_brussel;h=81facf5cb106a8e4c2a76c048694a3043b158d62;hb=HEAD
The scanner uses two Canon point and shoot cameras. Both cameras are connected to the PC with USB. They both run
PTP/CHDK (Canon Hack Development Kit). The scanning sequence is the following:
1. Script sends CHDK command line instructions to the cameras
2. Script sorts out the incoming files. This part is tricky. There is no reliable way to make a distinction between the left
and right camera, only between which camera was recognized by USB first. So the protocol is to always power up the
left camera first. See the instructions with the source code.
3. Collect images in a PDF file
4. Run script to OCR a .PDF file to plain .TXT file: http://git.constantvzw.org/?
p=algolit.git;a=blob;f=scanbot_brussel/ocr_pdf.sh;h=2c1f24f9afcce03520304215951c65f58c0b880c;hb=HEAD
I. PHOTOGRAPHING A PRINTED BOOK
Technologically the most demanding part of the scanning process is creating digital images of the
pages of a printed book. It's a process that is very different form scanner design to scanner design,
from camera to camera. Therefore, here we will focus strictly on the process with the Public Library
scanner.
Operating the Public Library scanner
0. Before you start:
Better and more consistent photographs lead to a more optimized and faster post-processing and a
higher quality of the resulting digital e-book. In order to guarantee the quality of images, before you
start it is necessary to set up the cameras properly and prepare the printed book for scanning.
a) Loosening the book
Depending on the type and quality of binding, some books tend to be too resistant to opening fully
to reveal the inner margin under the pressure of the scanner platen. It is thus necessary to “break in”
the book before starting in order to loosen the binding. The best way is to open it as wide as
possible in multiple places in the book. This can be done against the table edge if the book is more
rigid than usual. (Warning – “breaking in” might create irreversible creasing of the spine or lead to
some pages breaking loose.)
b) Switch on the scanner
You start the scanner by pressing the main switch or plugging the power cable into the the scanner.
This will also turn on the overhead LED lights.
c) Setting up the cameras
Place the cameras onto tripods. You need to move the lever on the tripod's head to allow the tripod
plate screwed to the bottom of the camera to slide into its place. Secure the lock by turning the lever
all the way back.
If the automatic chargers for the camera are provided, open the battery lid on the bottom of the
camera and plug the automatic charger. Close the lid.
Switch on the cameras using the lever on the top right side of the camera's body and place it into the
aperture priority (Av) mode on the mode dial above the lever (see Illustration 3). Use the main dial
just above the shutter button on the front side of the camera to set the aperture value to F8.0.
Illustration 3: Mode and main dial, focus mode switch, zoom
and focus ring
On the lens, turn the focus mode switch to manual (MF), turn the large zoom ring to set the value
exactly midway between 24 and 35 mm (see Illustration 3). Try to set both cameras the same.
To focus each camera, open a book on the cradle, lower the platen by holding the big button on the
controller, and turn on the live view on camera LCD by pressing the live view switch (see
Illustration 4). Now press the magnification button twice and use the focus ring on the front of the
lens to get a clear image view.
Illustration 4: Live view switch and magnification button
d) Connecting the cameras
Now connect the cameras to the remote shutter trigger cables that can be found lying on each side
of the scanner. They need to be plugged into a small round port hidden behind a protective rubber
cover on the left side of the cameras.
e) Placing the book into the cradle and double-checking the cameras
Open the book in the middle and place it on the cradle. Hold pressed the large button on the
controller to lower the Plexiglas platen without triggering the cameras. Move the cradle so that the
the platen fits into with the middle of the book.
Turn on the live view on the cameras' LED to see if the the pages fit into the image and if the
cameras are positioned parallel to the page.
f) Double-check storage cards and batteries
It is important that both storage cards on cameras are empty before starting the scanning in order
not to mess up the page sequence when merging photos from the left and the right camera in the
post-processing. To double-check, press play button on cameras and erase if there are some photos
left from the previous scan -- this you do by pressing the menu button, selecting the fifth menu from
the left and then select 'Erase Images' -> 'All images on card' -> 'OK'.
If no automatic chargers are provided, double-check on the information screen that batteries are
charged. They should be fully charged before starting with the scanning of a new book.
g) Turn off the light in the room
Lighting conditions during scanning should be as constant as possible, to reduce glare and achieve
maximum quality remove any source of light that might reflect off the Plexiglas platen. Preferably
turn off the light in the room or isolate the scanner with the black cloth provided.
1. Photographing a book
Now you are ready to start scanning. Place the book closed in the cradle and lower the platen by
holding the large button on the controller pressed (see Illustration 2). Adjust the position of the
cradle and lift the platen by pressing the large button again.
To scan you can now either use the small button on the controller to lower the platen, adjust and
then press it again to trigger the cameras and lift the platen. Or, you can just make a short press on
the large button to do it in one go.
ATTENTION: When the cameras are triggered, the shutter sound has to be heard coming
from both cameras. If one camera is not working, it's best to reconnect both cameras (see
Section 0), make sure the batteries are charged or adapters are connected, erase all images
and restart.
A mistake made in the photographing requires a lot of work in the post-processing, so it's
much quicker to repeat the photographing process.
If you make a mistake while flipping pages, or any other mistake, go back and scan from the page
you missed or incorrectly scanned. Note down the page where the error occurred and in the postprocessing the redundant images will be removed.
ADVICE: The scanner has a digital counter. By turning the dial forward and backward, you
can set it to tell you what page you should be scanning next. This should help you avoid
missing a page due to a distraction.
While scanning, move the cradle a bit to the left from time to time, making sure that the tip of Vshaped platen is aligned with the center of the book and the inner margin is exposed enough.
II. GETTING THE IMAGE FILES READY FOR POST-PROCESSING
Once the book pages have been photographed, they have to be transfered to the computer and
prepared for post-processing. With two-camera scanners, the capturing process will result in two
separate sets of images -- odd and even pages -- coming from the left and right cameras respectively
-- and you will need to rename and reorder them accordingly, rotate them into a vertical position
and collate them into a single sequence of files.
a) Transferring image files
For the transfer of files your principle process design choices are either to copy the files by
removing the memory cards from the cameras and copying them to the computer via a card reader
or to transfer them via a USB cable. The latter process can be automated by remote operating your
cameras from a computer, however this can be done only with a certain number of Canon cameras
(http://bit.ly/16xhJ6b) that can be hacked to run the open Canon Hack Development Kit firmware
(http://chdk.wikia.com).
After transferring the files, you want to erase all the image files on the camera memory card, so that
they would not end up messing up the scan of the next book.
b) Renaming image files
As the left and right camera are typically operated in sync, the photographing process results in two
separate sets of images, with even and odd pages respectively, that have completely different file
names and potentially same time stamps. So before you collate the page images in the order how
they appear in the book, you want to rename the files so that the first image comes from the right
camera, the second from the left camera, the third comes again from the right camera and so on.
You probably want to do a batch renaming, where your right camera files start with n and are offset
by an increment of 2 (e.g. page_0000.jpg, page_0002.jpg,...) and your left camera files start with
n+1 and are also offset by an increment of 2 (e.g. page_0001.jpg, page_0003.jpg,...).
Batch renaming can be completed either from your file manager, in command line or with a number
of GUI applications (e.g. GPrename, rename, cuteRenamer on GNU/Linux).
c) Rotating image files
Before you collate the renamed files, you might want to rotate them. This is a step that can be done
also later in the post-processing (see below), but if you are automating or scripting your steps this is
a practical place to do it. The images leaving your cameras will be positioned horizontally. In order
to position them vertically, the images from the camera on the right will have to be rotated by 90
degrees counter-clockwise, the images from the camera on the left will have to be rotated by 90
degrees clockwise.
Batch rotating can be completed in a number of photo-processing tools, in command line or
dedicated applications (e.g. Fstop, ImageMagick, Nautilust Image Converter on GNU/Linux).
d) Collating images into a single batch
Once you're done with the renaming and rotating of the files, you want to collate them into the same
folder for easier manipulation later.
Getting the image files ready for post-processing on the Public Library scanner
In the case of Public Library scanner, a custom C++ script was written by Mislav Stublić to
facilitate the transfer, renaming, rotating and collating of the images from the two cameras.
The script prompts the user to place into the card reader the memory card from the right camera
first, gives a preview of the first and last four images and provides an entry field to create a subfolder in a local cloud storage folder (path: /home/user/Copy).
It transfers, renames, rotates the files, deletes them from the card and prompts the user to replace the
card with the one from the left camera in order to the transfer the files from there and place them in
the same folder. The script was created for GNU/Linux system and it can be downloaded, together
with its source code, from: https://copy.com/nLSzflBnjoEB
If you have other cameras than Canon, you can edit the line 387 of the source file to change to the
naming convention of your cameras, and recompile by running the following command in your
terminal: "gcc scanflow.c -o scanflow -ludev `pkg-config --cflags --libs gtk+-2.0`"
In the case of Hacker Space Bruxelles scanner, this is handled by the same script that operates the cameras that can be
downloaded from: http://git.constantvzw.org/?
p=algolit.git;a=tree;f=scanbot_brussel;h=81facf5cb106a8e4c2a76c048694a3043b158d62;hb=HEAD
III. TRANSFORMATION OF SOURCE IMAGES INTO .TIFFS
Images transferred from the cameras are high definition full color images. You want your cameras
to shoot at the largest possible .jpg resolution in order for resulting files to have at least 300 dpi (A4
at 300 dpi requires a 9.5 megapixel image). In the post-processing the size of the image files needs
to be reduced down radically, so that several hundred images can be merged into an e-book file of a
tolerable size.
Hence, the first step in the post-processing is to crop the images from cameras only to the content of
the pages. The surroundings around the book that were captured in the photograph and the white
margins of the page will be cropped away, while the printed text will be transformed into black
letters on white background. The illustrations, however, will need to be preserved in their color or
grayscale form, and mixed with the black and white text. What were initially large .jpg files will
now become relatively small .tiff files that are ready for optical character recognition process
(OCR).
These tasks can be completed by a number of software applications. Our manual will focus on one
that can be used across all major operating systems -- ScanTailor. ScanTailor can be downloaded
from: http://scantailor.sourceforge.net/. A more detailed video tutorial of ScanTailor can be found
here: http://vimeo.com/12524529.
ScanTailor: from a photograph of a page to a graphic file ready for OCR
Once you have transferred all the photos from cameras to the computer, renamed and rotated them,
they are ready to be processed in the ScanTailor.
1) Importing photographs to ScanTailor
- start ScanTailor and open ‘new project’
- for ‘input directory’ chose the folder where you stored the transferred and renamed photo images
- you can leave ‘output directory’ as it is, it will place your resulting .tiffs in an 'out' folder inside
the folder where your .jpg images are
- select all files (if you followed the naming convention above, they will be named
‘page_xxxx.jpg’) in the folder where you stored the transferred photo images, and click 'OK'
- in the dialog box ‘Fix DPI’ click on All Pages, and for DPI choose preferably '600x600', click
'Apply', and then 'OK'
2) Editing pages
2.1 Rotating photos/pages
If you've rotated the photo images in the previous step using the scanflow script, skip this step.
- Rotate the first photo counter-clockwise, click Apply and for scope select ‘Every other page’
followed by 'OK'
- Rotate the following photo clockwise, applying the same procedure like in the previous step
2.2 Deleting redundant photographs/pages
- Remove redundant pages (photographs of the empty cradle at the beginning and the end of the
book scanning sequence; book cover pages if you don’t want them in the final scan; duplicate pages
etc.) by right-clicking on a thumbnail of that page in the preview column on the right side, selecting
‘Remove from project’ and confirming by clicking on ‘Remove’.
# If you by accident remove a wrong page, you can re-insert it by right-clicking on a page
before/after the missing page in the sequence, selecting 'insert after/before' (depending on which
page you selected) and choosing the file from the list. Before you finish adding, it is necessary to
again go through the procedure of fixing DPI and Rotating.
2.3 Adding missing pages
- If you notice that some pages are missing, you can recapture them with the camera and insert them
manually at this point using the procedure described above under 2.2.
3) Split pages and deskew
Steps ‘Split pages’ and ‘Deskew’ should work automatically. Run them by clicking the ‘Play’ button
under the 'Select content' function. This will do the three steps automatically: splitting of pages,
deskewing and selection of content. After this you can manually re-adjust splitting of pages and deskewing.
4) Selecting content
Step ‘Select content’ works automatically as well, but it is important to revise the resulting selection
manually page by page to make sure the entire content is selected on each page (including the
header and page number). Where necessary, use your pointer device to adjust the content selection.
If the inner margin is cut, go back to 'Split pages' view and manually adjust the selected split area. If
the page is skewed, go back to 'Deskew' and adjust the skew of the page. After this go back to
'Select content' and readjust the selection if necessary.
This is the step where you do visual control of each page. Make sure all pages are there and
selections are as equal in size as possible.
At the bottom of thumbnail column there is a sort option that can automatically arrange pages by
the height and width of the selected content, making the process of manual selection easier. The
extreme differences in height should be avoided, try to make selected areas as much as possible
equal, particularly in height, across all pages. The exception should be cover and back pages where
we advise to select the full page.
5) Adjusting margins
For best results select in the previous step content of the full cover and back page. Now go to the
'Margins' step and set under Margins section both Top, Bottom, Left and Right to 0.0 and do 'Apply
to...' → 'All pages'.
In Alignment section leave 'Match size with other pages' ticked, choose the central positioning of
the page and do 'Apply to...' → 'All pages'.
6) Outputting the .tiffs
Now go to the 'Output' step. Ignore the 'Output Resolution' section.
Next review two consecutive pages from the middle of the book to see if the scanned text is too
faint or too dark. If the text seems too faint or too dark, use slider Thinner – Thicker to adjust. Do
'Apply to' → 'All pages'.
Next go to the cover page and select under Mode 'Color / Grayscale' and tick on 'White Margins'.
Do the same for the back page.
If there are any pages with illustrations, you can choose the 'Mixed' mode for those pages and then
under the thumb 'Picture Zones' adjust the zones of the illustrations.
Now you are ready to output the files. Just press 'Play' button under 'Output'. Once the computer is
finished processing the images, just do 'File' → 'Save as' and save the project.
IV. OPTICAL CHARACTER RECOGNITION
Before the edited-down graphic files are finalized as an e-book, we want to transform the image of
the text into an actual text that can be searched, highlighted, copied and transformed. That
functionality is provided by Optical Character Recognition. This a technically difficult task dependent on language, script, typeface and quality of print - and there aren't that many OCR tools
that are good at it. There is, however, a relatively good free software solution - Tesseract
(http://code.google.com/p/tesseract-ocr/) - that has solid performance, good language data and can
be trained for an even better performance, although it has its problems. Proprietary solutions (e.g.
Abby FineReader) sometimes provide superior results.
Tesseract supports as input format primarily .tiff files. It produces a plain text file that can be, with
the help of other tools, embedded as a separate layer under the original graphic image of the text in
a PDF file.
With the help of other tools, OCR can be performed also against other input files, such as graphiconly PDF files. This produces inferior results, depending again on the quality of graphic files and
the reproduction of text in them. One such tool is a bashscript to OCR a ODF file that can be found
here: https://github.com/andrecastro0o/ocr/blob/master/ocr.sh
As mentioned in the 'before scanning' section, the quality of the original book will influence the
quality of the scan and thus the quality of the OCR. For a comparison, have a look here:
http://www.paramoulipist.be/?p=1303
Once you have your .txt file, there is still some work to be done. Because OCR has difficulties to
interpret particular elements in the lay-out and fonts, the TXT file comes with a lot of errors.
Recurrent problems are:
- combinations of specific letters in some fonts (it can mistake 'm' for 'n' or 'I' for 'i' etc.);
- headers become part of body text;
- footnotes are placed inside the body text;
- page numbers are not recognized as such.
V. CREATING A FINALIZED E-BOOK FILE
After the optical character recognition has been completed, the resulting text can be merged with
the images of pages and output into an e-book format. While increasingly the proper e-book file
formats such as ePub have been gaining ground, PDFs still remain popular because many people
tend to read on their computers, and they retain the original layout of the book on paper including
the absolute pagination needed for referencing in citations. DjVu is also an option, as an alternative
to PDF, used because of its purported superiority, but it is far less popular.
The export to PDF can be done again with a number of tools. In our case we'll complete the optical
character recognition and PDF export in gscan2pdf. Again, the proprietary Abbyy FineReader will
produce a bit smaller PDFs.
If you prefer to use an e-book format that works better with e-book readers, obviously you will have
to remove some of the elements that appear in the book - headers, footers, footnotes and pagination.
This can be done earlier in the process of cropping down the original .jpg image files (see under III)
or later by transforming the PDF files. This can be done in Calibre (http://calibre-ebook.com) by
converting the PDF into an ePub, where it can be further tweaked to better accommodate or remove
the headers, footers, footnotes and pagination.
Optical character recognition and PDF export in Public Library workflow
Optical character recognition with the Tesseract engine can be performed on GNU/Linux by a
number of command line and GUI tools. Much of those tools exist also for other operating systems.
For the users of the Public Library workflow, we recommend using gscan2pdf application both for
the optical character recognition and the PDF or DjVu export.
To do so, start gscan2pdf and open your .tiff files. To OCR them, go to 'Tools' and select 'OCR'. In
the dialog box select the Tesseract engine and your language. 'Start OCR'. Once the OCR is
finished, export the graphic files and the OCR text to PDF by selecting 'Save as'.
However, given that sometimes the proprietary solutions produce better results, these tasks can also
be done, for instance, on the Abbyy FineReader running on a Windows operating system running
inside the Virtual Box. The prerequisites are that you have both Windows and Abbyy FineReader
you can install in the Virtual Box. If using Virtual Box, once you've got both installed, you need to
designate a shared folder in your Virtual Box and place the .tiff files there. You can now open them
from the Abbyy FineReader running in the Virtual Box, OCR them and export them into a PDF.
To use Abbyy FineReader transfer the output files in your 'out' out folder to the shared folder of the
VirtualBox. Then start the VirtualBox, start Windows image and in Windows start Abbyy
FineReader. Open the files and let the Abbyy FineReader read the files. Once it's done, output the
result into PDF.
VI. CATALOGING AND SHARING THE E-BOOK
Your road from a book on paper to an e-book is complete. If you want to maintain your library you
can use Calibre, a free software tool for e-book library management. You can add the metadata to
your book using the existing catalogues or you can enter metadata manually.
Now you may want to distribute your book. If the work you've digitized is in the public domain
(https://en.wikipedia.org/wiki/Public_domain), you might consider contributing it to the Gutenberg
project
(http://www.gutenberg.org/wiki/Gutenberg:Volunteers'_FAQ#V.1._How_do_I_get_started_as_a_Pr
oject_Gutenberg_volunteer.3F ), Wikibooks (https://en.wikibooks.org/wiki/Help:Contributing ) or
Arhive.org.
If the work is still under copyright, you might explore a number of different options for sharing.
QUICK WORKFLOW REFERENCE FOR SCANNING AND
POST-PROCESSING ON PUBLIC LIBRARY SCANNER
I. PHOTOGRAPHING A PRINTED BOOK
0. Before you start:
- loosen the book binding by opening it wide on several places
- switch on the scanner
- set up the cameras:
- place cameras on tripods and fit them tigthly
- plug in the automatic chargers into the battery slot and close the battery lid
- switch on the cameras
- switch the lens to Manual Focus mode
- switch the cameras to Av mode and set the aperture to 8.0
- turn the zoom ring to set the focal length exactly midway between 24mm and 35mm
- focus by turning on the live view, pressing magnification button twice and adjusting the
focus to get a clear view of the text
- connect the cameras to the scanner by plugging the remote trigger cable to a port behind a
protective rubber cover on the left side of the cameras
- place the book into the crade
- double-check storage cards and batteries
- press the play button on the back of the camera to double-check if there are images on the
camera - if there are, delete all the images from the camera menu
- if using batteries, double-check that batteries are fully charged
- switch off the light in the room that could reflect off the platen and cover the scanner with the
black cloth
1. Photographing
- now you can start scanning either by pressing the smaller button on the controller once to
lower the platen and adjust the book, and then press again to increase the light intensity, trigger the
cameras and lift the platen; or by pressing the large button completing the entire sequence in one
go;
- ATTENTION: Shutter sound should be coming from both cameras - if one camera is not
working, it's best to reconnect both cameras, make sure the batteries are charged or adapters
are connected, erase all images and restart.
- ADVICE: The scanner has a digital counter. By turning the dial forward and backward,
you can set it to tell you what page you should be scanning next. This should help you to
avoid missing a page due to a distraction.
II. Getting the image files ready for post-processing
- after finishing with scanning a book, transfer the files to the post-processing computer
and purge the memory cards
- if transferring the files manually:
- create two separate folders,
- transfer the files from the folders with image files on cards, using a batch
renaming software rename the files from the right camera following the convention
page_0001.jpg, page_0003.jpg, page_0005.jpg... -- and the files from the left camera
following the convention page_0002.jpg, page_0004.jpg, page_0006.jpg...
- collate image files into a single folder
- before ejecting each card, delete all the photo files on the card
- if using the scanflow script:
- start the script on the computer
- place the card from the right camera into the card reader
- enter the name of the destination folder following the convention
"Name_Surname_Title_of_the_Book" and transfer the files
- repeat with the other card
- script will automatically transfer the files, rename, rotate, collate them in proper
order and delete them from the card
III. Transformation of source images into .tiffs
ScanTailor: from a photograph of page to a graphic file ready for OCR
1) Importing photographs to ScanTailor
- start ScanTailor and open ‘new project’
- for ‘input directory’ chose the folder where you stored the transferred photo images
- you can leave ‘output directory’ as it is, it will place your resulting .tiffs in an 'out' folder
inside the folder where your .jpg images are
- select all files (if you followed the naming convention above, they will be named
‘page_xxxx.jpg’) in the folder where you stored the transferred photo images, and click
'OK'
- in the dialog box ‘Fix DPI’ click on All Pages, and for DPI choose preferably '600x600',
click 'Apply', and then 'OK'
2) Editing pages
2.1 Rotating photos/pages
If you've rotated the photo images in the previous step using the scanflow script, skip this step.
- rotate the first photo counter-clockwise, click Apply and for scope select ‘Every other
page’ followed by 'OK'
- rotate the following photo clockwise, applying the same procedure like in the previous
step
2.2 Deleting redundant photographs/pages
- remove redundant pages (photographs of the empty cradle at the beginning and the end;
book cover pages if you don’t want them in the final scan; duplicate pages etc.) by rightclicking on a thumbnail of that page in the preview column on the right, selecting ‘Remove
from project’ and confirming by clicking on ‘Remove’.
# If you by accident remove a wrong page, you can re-insert it by right-clicking on a page
before/after the missing page in the sequence, selecting 'insert after/before' and choosing the file
from the list. Before you finish adding, it is necessary to again go the procedure of fixing DPI and
rotating.
2.3 Adding missing pages
- If you notice that some pages are missing, you can recapture them with the camera and
insert them manually at this point using the procedure described above under 2.2.
3)
Split pages and deskew
- Functions ‘Split Pages’ and ‘Deskew’ should work automatically. Run them by
clicking the ‘Play’ button under the 'Select content' step. This will do the three steps
automatically: splitting of pages, deskewing and selection of content. After this you can
manually re-adjust splitting of pages and de-skewing.
4)
Selecting content and adjusting margins
- Step ‘Select content’ works automatically as well, but it is important to revise the
resulting selection manually page by page to make sure the entire content is selected on
each page (including the header and page number). Where necessary use your pointer device
to adjust the content selection.
- If the inner margin is cut, go back to 'Split pages' view and manually adjust the selected
split area. If the page is skewed, go back to 'Deskew' and adjust the skew of the page. After
this go back to 'Select content' and readjust the selection if necessary.
- This is the step where you do visual control of each page. Make sure all pages are there
and selections are as equal in size as possible.
- At the bottom of thumbnail column there is a sort option that can automatically arrange
pages by the height and width of the selected content, making the process of manual
selection easier. The extreme differences in height should be avoided, try to make
selected areas as much as possible equal, particularly in height, across all pages. The
exception should be cover and back pages where we advise to select the full page.
5) Adjusting margins
- Now go to the 'Margins' step and set under Margins section both Top, Bottom, Left and
Right to 0.0 and do 'Apply to...' → 'All pages'.
- In Alignment section leave 'Match size with other pages' ticked, choose the central
positioning of the page and do 'Apply to...' → 'All pages'.
6) Outputting the .tiffs
- Now go to the 'Output' step.
- Review two consecutive pages from the middle of the book to see if the scanned text is
too faint or too dark. If the text seems too faint or too dark, use slider Thinner – Thicker to
adjust. Do 'Apply to' → 'All pages'.
- Next go to the cover page and select under Mode 'Color / Grayscale' and tick on 'White
Margins'. Do the same for the back page.
- If there are any pages with illustrations, you can choose the 'Mixed' mode for those
pages and then under the thumb 'Picture Zones' adjust the zones of the illustrations.
- To output the files press 'Play' button under 'Output'. Save the project.
IV. Optical character recognition & V. Creating a finalized e-book file
If using all free software:
1) open gscan2pdf (if not already installed on your machine, install gscan2pdf from the
repositories, Tesseract and data for your language from https://code.google.com/p/tesseract-ocr/)
- point gscan2pdf to open your .tiff files
- for Optical Character Recognition, select 'OCR' under the drop down menu 'Tools',
select the Tesseract engine and your language, start the process
- once OCR is finished and to output to a PDF, go under 'File' and select 'Save', edit the
metadata and select the format, save
If using non-free software:
2) open Abbyy FineReader in VirtualBox (note: only Abby FineReader 10 installs and works with some limitations - under GNU/Linux)
- transfer files in the 'out' folder to the folder shared with the VirtualBox
- point it to the readied .tiff files and it will complete the OCR
- save the file
REFERENCES
For more information on the book scanning process in general and making your own book scanner
please visit:
DIY Book Scanner: http://diybookscannnner.org
Hacker Space Bruxelles scanner: http://hackerspace.be/ScanBot
Public Library scanner: http://www.memoryoftheworld.org/blog/2012/10/28/our-belovedbookscanner/
Other scanner builds: http://wiki.diybookscanner.org/scanner-build-list
For more information on automation:
Konrad Voeckel's post-processing script (From Scan to PDF/A):
http://blog.konradvoelkel.de/2013/03/scan-to-pdfa/
Johannes Baiter's automation of scanning to PDF process: http://spreads.readthedocs.org
For more information on applications and tools:
Calibre e-book library management application: http://calibre-ebook.com/
ScanTailor: http://scantailor.sourceforge.net/
gscan2pdf: http://sourceforge.net/projects/gscan2pdf/
Canon Hack Development Kit firmware: http://chdk.wikia.com
Tesseract: http://code.google.com/p/tesseract-ocr/
Python script of Hacker Space Bruxelles scanner: http://git.constantvzw.org/?
p=algolit.git;a=tree;f=scanbot_brussel;h=81facf5cb106a8e4c2a76c048694a3043b158d62;hb=HEA
D