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.
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8. curl

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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
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13. convert

14. convert -colorspace Gray

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

    \ -contrast -contrast \
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18. Convert image to 1px x height

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20. Sharpen the image

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

    are white

22. convert to txt

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

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28. github.com ewlarson/picturepages

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

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

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

    http://openlibrary.org/books/OL7050533M/Around_the_world_in_eighty_days
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38. Wanna help do this better? Contact me. [email protected]