signature verification preprocessing problem

Hello, I am working on a project related to image processing. I'm stuck in the preprocessing area. I've collected signature samples and I need to extract only signature part of the image and want to remove the white area. I consulted my guide, and he suggested that I count the number of pixels which are white from top to bottom, left to right, and then delete them. The first black pixel from where signature starts from all sides will be ur limit up until any pixel is white ll be deleted. I don't know how to proceed. plz help!!

[Image Analyst]

I'm not sure I understand your proposed algorithm. Can you upload an image?

Answer 1

[Amith Kamath]

I would suggest something on the lines of http://www.fml.tuebingen.mpg.de/raetsch/suppl/shogun/MatlabExamples to really think of tackling the handwriting recognition/verification problem.

As a quick-fix for this particular problem, I would rather invert the image, look at smaller patches in the image, sum the pixel values in the patch, and if it's greater than a particular threshold, so that it shows that some non-black regions in that patch exist, then keep the region, else delete it using imcrop.

Hope this helps!

Answer 2

[Luis Flores]

Hi:

Please find in the link below a project in spanish of an off-line signature verification system. This project extracts many features from the signature digital image including the area, entropy, the intersection and end points extracted from the skeleton, etc... I think you can find it useful. You need to request a copy of the source code...

http://www.tecnohobby.net/ppal/index.php?option=com_content&view=article&id=34:signatureverificationsystem&catid=30:reconocimiento-patrones&Itemid=19

[Roberto Pepe]

Luis, sigues teniendo el codigo del proyecto de verificación de firmas ?

Ya no se encuentra en el link que esta aqui publicado