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how to recognize circle in a segmented image

i am developing a content based image retrieval system. now i want to recognize the shape from a region segmented image in form of a matrix. i am working on jpeg format. when i used compactness parameter ie perimeter*perimeter/area of the region, the results are at times correct and at times incorrect. could u suggest any other way to identify the regions.
what i could find is the problem is of compression and decompression. is there any method to solve this????
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kashish_18_2003
Asked:
kashish_18_2003
1 Solution
 
Tommy BraasCommented:
You know what the equation for drawing a 2D circle is, so with that knowledge you would calculate a distance from what you suspect in your image is a circle, and a perfect circle.

You should first calculate the bounding box for the shape you suspect is a circle, then calculate the values of a prefect circle with the same bounding box. Calculate the distance for each pixel between the shape and the perfect circle. If the values on average are less than a certain threshold, you have recognized a circle, otherwise it's a different shape.
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