Upgrade to Pro — share decks privately, control downloads, hide ads and more …

Finding images in book page images

Avatar for Eric Larson Eric Larson
February 07, 2012
Programming
800
4

Finding images in book page images

Code4Lib 2012 Lighting Talk Presentation

Avatar for Eric Larson

Eric Larson

February 07, 2012

More Decks by Eric Larson

See All by Eric Larson
Put Your Money Where The Mouse is: Tools and Techniques for Making Informed Design Decisions
Avatar for Eric Larson ewlarson
0
40
Usability Testing Primo
Avatar for Eric Larson ewlarson
0
98
Ruby Tips
Avatar for Eric Larson ewlarson
0
120
9 Keys to Great UX
Avatar for Eric Larson ewlarson
0
93

Other Decks in Programming

See All in Programming
Embedded SREと共に達成した会員管理システムのAWS移行 - SRE NEXT 2026 ランチスポンサーセッション
Avatar for ニフティ株式会社 niftycorp
PRO
1
2.3k
気圧・高度・GPSを記録&可視化するアプリ「Koudo」を作った話
Avatar for Hajime Kato hjmkth
1
350
LaravelLive Japan の裏方のすべて — 第188回 PHP勉強会＠東京 (2026-06-24)
Avatar for Suguru Oki / スー suguruooki
2
150
えっ!!コードを読まずに開発を!?
Avatar for はなのうち hananouchi
0
180
OSINT for SRE: 
学術論文とポストモーテムから探る
システム障害の共通パターン / SRE NEXT 2026
Avatar for Tomoyuki KOYAMA tomoyk
1
3.4k
The Bowling Game - From Imperative to Functional Programming - Part 1
Avatar for Philip Schwarz philipschwarz
PRO
0
300
AI時代の仕事技芸論〜ソフトウェア開発で「遊ぶように働く」職人的熟達のすすめ（スクフェス仙台 2026バージョン）
Avatar for Yoshihito Kuranuki / 倉貫義人 kuranuki
0
600
Vue × Nuxt × Oxc どこまで使える？実運用の現在地
Avatar for ANDPAD inc andpad
0
370
地域 SRE コミュニティ最前線 - ホンマでっかSRE勉強会
Avatar for tk3fftk tk3fftk
0
220
分散システム、なんですぐ死んでしまうん？耐障害性を高めたいあなたのためのレジリエンスパターン入門
Avatar for Mitsuhiro Shibuya mshibuya
7
5.7k
フィードバックで育てるAI開発
Avatar for Kota Minato kotaminato
1
110
ビデオ通話が繋がる0.2秒で何が起きているのか
Avatar for Miyamoto Naoyuki supurazako
2
130

Featured

See All Featured
Let's Do A Bunch of Simple Stuff to Make Websites Faster
Avatar for Chris Coyier chriscoyier
508
140k
Designing Experiences People Love
Avatar for Jonathan Moore moore
143
24k
The Language of Interfaces
Avatar for Des Traynor destraynor
162
27k
RailsConf 2023
Avatar for Aaron Patterson tenderlove
30
1.5k
A Guide to Academic Writing Using Generative AI - A Workshop
Avatar for Kenji Saito ks91
PRO
1
350
Side Projects
Avatar for Sacha Greif sachag
455
43k
Building a A Zero-Code AI SEO Workflow
Avatar for Ian Lurie portentint
PRO
0
630
GraphQLの誤解/rethinking-graphql
Avatar for sonatard sonatard
75
12k
The Success of Rails: Ensuring Growth for the Next 100 Years
Avatar for Eileen M. Uchitelle eileencodes
47
8.2k
Crafting Experiences
Avatar for Bethany Jepchumba bethany
1
210
Practical Tips for Bootstrapping Information Extraction Pipelines
Avatar for Matthew Honnibal honnibal
25
2k
Improving Core Web Vitals using Speculation Rules API
Avatar for Sergey Chernyshev sergeychernyshev
21
1.5k

Transcript

  1. Finding images in book page images Eric Larson University of

    Wisconsin-Madison Libraries

  2. Warning Hobbyist code here. I’m certain there are better ways

    to do this.
  3. None
  4. None
  5. None
  6. None
  7. None

  8. curl

  9. None

  10. imagemagick

  11. Processing steps 1. Desaturate the image 2. Boost contrast 3.

    Convert image to 1pixel wide x image height 4. Sharpen the image 5. Super-duper grayscale conversion 6. Produce the text color list 7. Look for continuous “black” blocks
  12. None

  13. convert

  14. convert -colorspace Gray

  15. None

  16. convert \ -contrast -contrast \ -contrast -contrast \ -contrast -contrast

    \ -contrast -contrast \
  17. None

  18. Convert image to 1px x height

  19. None

  20. Sharpen the image

  21. Heavy-handed grayscale conversion => make most grays black => whites

    are white

  22. convert to txt

  23. None

  24. Look for long, continuous blocks of “black”

  25. None
  26. None
  27. None

  28. github.com ewlarson/picturepages

  29. Don Quixote # (168/169) 99% Accurate http://openlibrary.org/books/OL24150024M/The_history_of_Don_Quixote

  30. None
  31. None

  32. Paradise Lost # (54/54) 100% Accurate http://openlibrary.org/books/OL14022842M/Paradise_Lost

  33. None
  34. None

  35. Around the World in Eighty Days # (60/62) 97% Accurate

    http://openlibrary.org/books/OL7050533M/Around_the_world_in_eighty_days
  36. None
  37. None

  38. Wanna help do this better? Contact me. [email protected]