Finding images in book page images

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. elarson@library.wisc.edu