Problem with Binarization

[davejaw]

Hello All,

I am trying to parse a reasonable looking text image.  After a bit of searching/reading, I suspect the problem is due to difficulty binarizing the image.  

I'm playing around with black/white threshold levels using GIMP but getting very different results with even small changes in thresholds (none of them very accurate.)

If anyone has some insight/experience with this issue, I'd really appreciate a nudge in the right direction.

I've attached the original "cruciate.png" with different black/white thresholds and their corresponding tesseract results. 

Thanks,
Dave

[Albrecht Hilker]

Tesseract requires test to be 300 DPI.

Resize your images with factor 3 and try again.
The built-in thresholder should be enough for your samples. (No Gimp required)

[Tom Morris]

Or better yet, rescan at the higher resolution so that the program doesn't need to deal with characters which touch, loops with their centers filled, etc.