OCRing simple numbers unreliable

[Borek Lupoměský]

I am OCRing numbers from images. I do all the processing with ImageMagick to end up with single isolated number (up to three numerals) Tesseract does good job most of the time, but sometimes it doesn't recognize number correctly. For example this image of number 27 gets recognized as "2/". How can I improve the reliability? Is expecting 100% success rate too much?

[Lorenzo Bolzani]

Hi,

try these (in any combination):

psm 6 or 7

remove white border (all or most)

downscale so that the font is 20/50px tall

fine tune a model to recognize only numbers

threshold

Otherwise post more details about how you are using tesseract.

Bye

Lorenzo

Il giorno mer 22 mag 2019 alle ore 11:05 Borek Lupoměský <borek.l...@gmail.com> ha scritto:

I am OCRing numbers from images. I do all the processing with ImageMagick to end up with single isolated number (up to three numerals) Tesseract does good job most of the time, but sometimes it doesn't recognize number correctly. For example this image of number 27 gets recognized as "2/". How can I improve the reliability? Is expecting 100% success rate too much?

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