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AnswerRe: Add folder to Start Menu Pin
ThatsAlok21-Mar-07 19:37
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QuestionRadio buttons and combo boxes Pin
gingerballs20-Mar-07 19:35
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_AnsHUMAN_ 20-Mar-07 19:48
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ThatsAlok20-Mar-07 22:25
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QuestionImage processing algorithms for extracting characters from image Pin
JanapatiBalu20-Mar-07 19:20
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AnswerRe: Image processing algorithms for extracting characters from image Pin
Russell'20-Mar-07 23:39
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GeneralRe: Image processing algorithms for extracting characters from image Pin
JanapatiBalu21-Mar-07 1:15
JanapatiBalu21-Mar-07 1:15 
GeneralRe: Image processing algorithms for extracting characters from image Pin
Russell'21-Mar-07 1:58
Russell'21-Mar-07 1:58 
I think that you can use the FFT-2D.
there is a simple way to find a sample image (like a char) on a picture simply matching the FFT-2D of the sample image with the fft of the given image.
The match can be more smart if you compare not simply the fft coefficients, but some coefficients ratio:
if you normalize every coeff by the coeff(0) [at null frequency] you will obtain coefficients that are indipendent from traslations and scalatures. To understand this look at the fft properties, and what happens to the coefficients with different scale, rotations, traslation.
It surely wiil work on this type of images
http://captchas.net/logo.png

your job can became very complex if the char are distorted, you have to understand how is working the distorsion and then find a righ way to recognise the chars.
see this strage deformations
http://en.wikipedia.org/wiki/Captcha


This can give you some ideas.
http://www.adastral.ucl.ac.uk/~icox/papers/2001/TransIP01.pdf

Cheers,
Russell

GeneralRe: Image processing algorithms for extracting characters from image Pin
JanapatiBalu21-Mar-07 2:37
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GeneralRe: Image processing algorithms for extracting characters from image Pin
JanapatiBalu21-Mar-07 2:48
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GeneralRe: Image processing algorithms for extracting characters from image Pin
Russell'21-Mar-07 3:09
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GeneralRe: Image processing algorithms for extracting characters from image Pin
JanapatiBalu21-Mar-07 3:35
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GeneralRe: Image processing algorithms for extracting characters from image Pin
Russell'21-Mar-07 3:42
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GeneralRe: Image processing algorithms for extracting characters from image Pin
JanapatiBalu21-Mar-07 4:20
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Questionhide dos windows Pin
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QuestionEffect of one Dialog event to other Dialogs Pin
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