Limit tesseract character to a-z and number only in my iOS app

Question

I am using tesseract for recognizing character in one of my iOS project. It is now reading all characters including alpha numeric character. But I want to read only character a-z and numbers 0-9. I followed Limit characters tesseract is looking for, but can't figure out how can I implement this in my iOS app.

Can anyone suggest me how can I implement this in my iOS project.

user18428 · Accepted Answer · 2013-03-22T12:16:00.597

7

You can specify the white list (allowed characters) using TessBaseAPI.SetVariable prior to extraction

 tesseract->SetVariable("tessedit_char_whitelist", "abcdefghijklmnopqrstuvwxyz012345789");

edited Mar 22 '13 at 12:16

answered Mar 22 '13 at 11:29

user18428

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the following code works for me: tesseract->SetVariable("tessedit_char_whitelist", "abcdefghijklmnopqrstuvwxyz012345789"); thanks a lot.... can you please edit your code, just change the syntax? thanks again.. – sumon Mar 22 '13 at 11:42

score 1 · Answer 2 · answered Mar 05 '15 at 15:36

1

Try this:

[tesseract setVariableValue:@"abcdefghijklmnopqrstuvwxyz012345789" forKey:@"tessedit_char_whitelist"];

also you can try variable "tessedit_char_blacklist"

answered Mar 05 '15 at 15:36

oscarr

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Limit tesseract character to a-z and number only in my iOS app

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