detect stamps

asked 2019-03-19 10:55:27 -0500

dineshganti gravatar image

updated 2019-03-20 01:49:26 -0500

berak gravatar image

Hi I have many images with stamps and handwritten- signatures inside them.

With regards to signatures I have posted a question in the forum.

I want to detect present of stamps

stamps are of two types circular,rectangle(different orientation) and alignment is random. some of the stamps are colored and some are not I want detect and log if a stamp is present

approach1: 1. Converted the image to grayscale 2. Did a binary threshold on the image 3. Finding contours(not sure how to return a value saying yes circle or square is present)

after step 3 i am stuck even if i find a contour how do I know it is a stamp


i am planning to get all images that look like a circle or square stamp and do a template matcing(Not sure if this is right approch)

Any suggestions appreciated

Thanks, C:\fakepath\sample4.jpg C:\fakepath\sample1.jpg C:\fakepath\sample3.jpg C:\fakepath\sample2.jpg

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could you provide some sample images

sturkmen gravatar imagesturkmen ( 2019-03-19 13:59:39 -0500 )edit

Hi, I added a few samples there are lot more types of stamps and signatures but these are the only ones i have with me here. Also i used paint to erase any information that should not be posted so these images might look strange but i tried to leave the stamp and signature intact almost

Thanks Dinesh

dineshganti gravatar imagedineshganti ( 2019-03-19 19:39:42 -0500 )edit