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ibeex/ocr.markdown

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Created October 14, 2013 20:38
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ocr.markdown

Install ImageMagick (>= 6.8.0-10) for image conversion:

brew install imagemagick

Install leptonica (>= 1.69) and tesseract (>= 3.02.02) for OCR:

brew install leptonica
brew install tesseract --all-languages

Or install without --all-languages and install them manually as needed.

Make sure the input image is a grayscale .tif and fairly large. ~500x150 was too small, while ~2000*500 worked very well.

convert input.png -resize 400% -type Grayscale input.tif

OCR it. The default language is English. Language codes are 3 chars per man tesseract. French language is coded 'fra'.

tesseract -l eng input.tif output

This creates output.txt.

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