tesseract-ocr word spacing problem

[Chang Alden]

I am using tesseract-ocr portable version exe with psm 3 to run the rectangle of bitmap for my images. The problem is it has incorrect spacing for some words(e.g. "this group" becomes "thisgroup"). I tried to correct this problem by resizing the bitmap to a larger size which successfully solves this problem, but then other spacing problem appears(e.g. "apple" becomes "appl e"). The words in the example is not the same as my test file but due to company policy I cannot reveal them. I think resizing the bitmap might not be the best way to solve the spacing problem. Is there other methods I can try out?

[Daniel Kraft]

Hi!

On 2015-11-10 14:04, Chang Alden wrote:
> I think resizing the bitmap might not be the best way to solve the
> spacing problem. Is there other methods I can try out?

I'm by no means a tesseract or OCR expert, but I've been experiencing
spacing issues myself (in my case, with columns of numbers).

For me, it worked very well to rotate failing images a few degrees. My
data contains checksums, so that I can determine automatically if a
recognition was correct or not; applying various rotations until it
succeeds works very well to improve my recognition rate significantly
(including for spaces). Not sure if that's an option for you, though.

Yours,
Daniel

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[Chang Alden]

Hi!

Thanks for the reply. I found HOCR in the command line option which shows the coordinates for the words, but which config file in tessdata/configs for Tesseract version 3.02 should I modify to get character confidence output? Thanks!

Daniel Kraft於 2015年11月10日星期二 UTC+8下午11時05分34秒寫道：