shape and color detection

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Tulips
Tulips 2012-6-9
hi sir, after I did color segmentation using HSV color threshold, I want to eliminate the undesired shapes.for example I want to do shape detection. How can I set the area and parameter that I want and eliminate the undesired shapes.I m currently working on road sign detection.based on color segmentation demos: http://www.mathworks.com/matlabcentral/fileexchange/?term=authorid%3A31862
it works perfect for color detection. then how can I modify the code so as it can be used for shape detection?many thanks!!!
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Tulips
Tulips 2012-6-9
how to code it?cant get it.using regionprops?how to do loops if I wanna remove unwanted noise?
Tulips
Tulips 2012-6-11
sir I did used this equation in my code circularities = Perimeter^2/(4 * pi (area) and I got the circularities values for the object detection. How can I eliminate the shape that I dont want?in my plotting image it show all detected objects.I want to just only get the circular shape and remove noncircular shape.

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