Re: [Bug-ocrad] OCR of messy computer printout

[Antonio Diaz Diaz]

Hello Karl,

Karl Berry wrote:
> I tried playing with the --thresheld, but the results will not
> noticeably better.  Are there other options or approaches which might help?

The image is not only not-very-cleanly scanned, it is also not-very-well 
printed. I guess it was printed with a real teletype. See the way a lot 
of zeros are printed in this image:

 · O O · · ·
 O O O O O ·
 · · · O O ·
 · · · · O ·
 · · · · O O
 · · + · O O
 · · · · O ·
 · · · · O ·
 · · · · O ·
 O · · O O ·
 · O O O · ·

The resolution of the scan is also too small. Ocrad needs a character 
height of 20 pixels for a good result, but as you can see, the zero 
above is only 11 pixels high. Using --scale=2 improves the result, but 
not much.

I think ocrad can't extract anything useful from this image. I think it 
will be difficult even for a human to retype it without errors.


Best regards,
Antonio.