OCR Character Confidence

Discussions about Tesseract OCR integration in GdPicture.
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ganeshj
Posts: 14
Joined: Fri Aug 07, 2009 7:46 am

OCR Character Confidence

Post by ganeshj » Fri Aug 07, 2009 7:55 am

I am doing OCR on an image and checking for Character Confidence.

for the Word FULL NAME when i use OCRTesseractGetCharConfidence

i get
F=19
U=19
L=19
L=19

N=65
A=65
M=65
E=65

When i debug in .Net i see the following values in the GDImaging Object
F=49
U=49
L=49
L=49

N=166
A=166
M=166
E=166

Can you tell me how these 2 values are related also which is more accurate the lower or higher value.
Also i have noticed that Confidence levels of a single word are always same as you can see above this is the case with other words as well. Is the confidence at Character or Word level.

Regards
Ganesh

ganeshj
Posts: 14
Joined: Fri Aug 07, 2009 7:46 am

Re: OCR Character Confidence

Post by ganeshj » Tue Aug 25, 2009 12:51 pm

Hi Loic,

Any update on the above question. Thanks.

ganeshj
Posts: 14
Joined: Fri Aug 07, 2009 7:46 am

Re: OCR Character Confidence

Post by ganeshj » Mon Sep 07, 2009 1:00 pm

Still waiting for a reply on this.

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Loïc
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Location: France
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Re: OCR Character Confidence

Post by Loïc » Mon Sep 07, 2009 2:32 pm

Hi,
Can you tell me how these 2 values are related also which is more accurate the lower or higher value.
You probably done something different to make test such as image filter or using different dictionary.
If you are able to reproduce this behavior in a comprehensive small application you can send it to esupport (at) gdpicture (dot) com for more investigations.


Is the confidence at Character or Word level.
word.

Kind regards,

Loïc

ategen
Posts: 1
Joined: Thu Dec 22, 2016 6:17 pm

Re: OCR Character Confidence

Post by ategen » Thu Dec 22, 2016 6:21 pm

I'm just guessing, but I believe what you are seeing is a difference in the range.

19 is 19% (range 0-100), but 49 is in the range of (0-255). 19 / 100 * 256 = 48.86.
65 / 100 * 256 = 166.4

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