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Improving Tesseract accuracy #7

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petermr opened this issue Jun 24, 2019 · 1 comment

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petermr commented Jun 24, 2019

This is a black art. This issue can be used to gather recent helpful hints

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petermr commented Jun 24, 2019 •

edited

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https://parzelsec.de/breaking-simple-captchas-in-python/

Key points:

--psm 8 will skip detection of the image structure and assume a single word. This may sometimes be useful.
whitelist: "tessedit_char_whitelist=...". It allows us to restrict the detection to only recognize characters we whitelisted. This currently can only be used with the legacy version of tesseract, which is why we also force tesseract to use this engine with the "--oem 0" parameter.

['tesseract', 'image.png', 'stdout', '--psm', '8', '--oem', '0', '-c', 'tessedit_char_whitelist=abcdefghijklmnopqrstuvwxyz', '--dpi', '70']

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