tesseract ocr wont read the letters in the attached chart

[JJ]

Hi

I have been trying to get tesseract ocr api and command line to recognize and locate the letters in the attached pic with no success.

I have modified the image, added blur and/or sharpened with no luck. To me it doesn't seem it should be that challenging

Anyone has any idea why?

I am using version 4.0 of the SDK

[Zdenko Podobny]

I am afraid you need to first implement some text detection algorithm for images like this... There is to much noise...

You wrote nothing about language you use. I just quickly search at internet I found e.g. this[1] solution in python, that correctly identified text regions in you image 

[1] https://github.com/azmiozgen/text-detection

Zdenko

ut 11. 12. 2018 o 8:39 JJ <joaquin....@gmail.com> napísal(a):

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[JJ]

Thanks  a lot

Actually tesseract 3.0 does recognize it. Unfortunatlly the c# api was based on tesseract 3.1 so I had to write a pinvoke for  tesseract 3.0 and problem solved.