Hi, I have drawn circle on top of color Image with viscircles function. I want to extract that part( may be as mask) and apply feature extraction on that part. Can anyone help me in how to do it...

I having color image. On top of that image I have drawn one circle covering area of interest. Now and want to use only that circle part for feature extraction. Not sure how to do it....

Answer 1

[Walter Roberson]

http://matlab.wikia.com/wiki/FAQ#How_do_I_create_a_circle.3F

[Walter Roberson]

You ignore the circle you drew on top and instead you use one of the methods of the above link in order to create a binary mask that has a circular pattern of bits set. Then you run your feature extraction code, programming it to ignore anything outside of the mask. There is no one routine to do this because there is no one way to do feature extraction.