Good image comparison technique for signatures.

I have two cropped images of a signature from bank cheque. What is the best way to compare the two images.

Pls some one help me with the code.

Thanks much.

Regards, Alex

Answer 1

[Image Analyst]

Alex, That method is extremely primitive and most likely won't work for more than a few signatures (a very tiny database). I suggest you look to published papers for successful algorithms:

23.4.6.4.3 Signature Recognition, Surveys, Analysis, Comparisons

http://iris.usc.edu/Vision-Notes/bibliography/contentschar.html#OCR,%20Document%20Analysis%20and%20Character%20Recognition%20Systems

Answer 2

[Jakob Sørensen]

Don't think code, until you have to idea in place. Do you have any specific ways you want it to work? Or any thoughts on it?

Answer 3

[Alex]

Till now, this is what we have progressed..

Input image
Grey scale conversion
Thresholding
Binarization
Edge Detection
Convolution

The final step is to compare the two cropped signatures. We tried to compare the image by using the average value of the intensity from the signature. It didn't work as we planned.

So, i am open to suggestions/ideas.

Answer 4

[Jakob Sørensen]

Supposing that the signature is more or less in the same place every time, how about some sort of cross correlation of the signature area?