Why does tessaract fail on this image?

[Tariq Ahmad]

I cannot understand whyTessaract fails on this (cropped) image:

Yet if i add a random white border it works:

Can anyone shed any light please?

[Zdenko Podobny]

https://github.com/tesseract-ocr/tessdoc/blob/master/ImproveQuality.md#missing-borders 

 

Zdenko

st 10. 6. 2020 o 18:50 'Tariq Ahmad' via tesseract-ocr <tesser...@googlegroups.com> napísal(a):

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[Tariq Ahmad]

Many thanks for your reply - useful to know.

I now find that pytesseract is returning the wrong coordinates for individual characters. For example, for this image (which has a 10pixel border):

image_to_boxes returns:

A: 17 32 10 22

L: 17 32 24 33

etc

etc

These I believe are interpreted as (left bottom right top) and when I extract the image for the letter A I get:

However, the same code works correctly for:

On Thursday, 11 June 2020 19:30:50 UTC+1, zdenop wrote:

https://github.com/tesseract-ocr/tessdoc/blob/master/ImproveQuality.md#missing-borders 

 

Zdenko

st 10. 6. 2020 o 18:50 'Tariq Ahmad' via tesseract-ocr <tesser...@googlegroups.com> napísal(a):

I cannot understand whyTessaract fails on this (cropped) image:

Yet if i add a random white border it works:

Can anyone shed any light please?

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[Zdenko Podobny]

search for forum/issue tracker - there is explanation why LSTM can not exact character  box coordinates.

If you need exact  character  boxes IMO you need to use legacy engine (but it could have other problems)

Zdenko

pi 12. 6. 2020 o 12:31 'Tariq Ahmad' via tesseract-ocr <tesser...@googlegroups.com> napísal(a):

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