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
810
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
47
Usability Testing Primo
Avatar for Eric Larson ewlarson
0
99
Ruby Tips
Avatar for Eric Larson ewlarson
0
120
9 Keys to Great UX
Avatar for Eric Larson ewlarson
0
95

Other Decks in Programming

See All in Programming
新卒PdEのリアル
Avatar for ryu ryu1013
1
270
Swift愛好会と私（ウホーイ） / Swift Fan Club and Uhooi
Avatar for uhooi uhooi
0
120
まずはプロンプトガイドを読もう、話はそれからだ
Avatar for Akira TSURUDA kiakiraki
1
250
My Marp Sample
Avatar for Shota Inoue sinoue0108
0
140
Claude Codeを組織的に動かして月400PRを実現した話
Avatar for happy_ryo happy_ryo
0
250
片田舎のおっさん、 Swift Buildのダイアモンド問題解決の不具合修正PRを出すが、解決方法がキャッシュをしないようにすることであり、ビルド時間が伸びると言われてマージされないので高速化もする/swiftbuild
Avatar for yimajo yimajo
0
350
AIと壁打ちしながら進めるコスト管理
Avatar for Ryoma Fujiwara fufuhu
2
1.9k
私のClaude Code活用法 （個人開発編） - PHPerKaigi mini #4（2026/08/24）
Avatar for panda_program panda_program
1
210
「つくるAI」だけではバグは見つからない　～テストに必要な「見つけるAI」を分離させる戦略～
Avatar for Masahiko Funaki(舟木 将彦) mfunaki
0
230
in-process GraphQL のすすめ #ginzajs
Avatar for izumin5210 izumin5210
4
1.5k
初心者DevRelとして参加者だった私が、DevRel Talks!#2に登壇するまでにしてきたこと
Avatar for Rai sokohirai
0
330
[DroidKaigi 26] How We Moved from Android Studio to Slack
Avatar for Ahmed Ali thisaay
0
190

Featured

See All Featured
Templates, Plugins, & Blocks: Oh My! Creating the theme that thinks of everything
Avatar for Michelle Schulp Hunt marktimemedia
31
2.9k
Helping Users Find Their Own Way: Creating Modern Search Experiences
Avatar for Dan Newman danielanewman
31
3.3k
How to Ace a Technical Interview
Avatar for Jacob Kaplan-Moss jacobian
281
24k
Building AI with AI
Avatar for Ines Montani inesmontani
PRO
1
1.2k
Google's AI Overviews - The New Search
Avatar for Barry Adams badams
0
1.6k
Leading Effective Engineering Teams in the AI Era
Avatar for Addy Osmani addyosmani
9
2.5k
The B2B funnel & how to create a winning content strategy
Avatar for Katarina Dahlin katarinadahlin
PRO
1
500
How to Build an AI Search Optimization Roadmap - Criteria and Steps to Take #SEOIRL
Avatar for Aleyda Solis aleyda
1
2.2k
How GitHub (no longer) Works
Avatar for Zach Holman holman
316
150k
How to make the Groovebox
Avatar for あそなす asonas
2
2.4k
The Invisible Side of Design
Avatar for Vitaly Friedman smashingmag
301
52k
Context Engineering - Making Every Token Count
Avatar for Addy Osmani addyosmani
9
1.1k

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]