how to detect circle using hough transform for color image?

currently i am working to circle the color image using hough transform,but i am unable to do that.kindly guide me. i have extracted color image and now want to circle that by using hough transform or any other good method. thanks

Answer 1

[Paul Shoemaker]

Have you searched the Matlab File Exchange? This one was featured on the "Pick of the Week" blog and may address your need.

Paul Shoemaker

http://www.matlabinvesting.com

[Muhammad Hammad Malik]

i tried this one but i want to circle color image. i applied this matlab code but i am having error in h = circle_hough(e, radii, 'same', 'normalise'); kindly solve the reason.thanks

im = imread('coins.png'); e = edge(im, 'canny'); imshow(e); radii = 15:1:40; h = circle_hough(e, radii, 'same', 'normalise'); %error peaks = circle_houghpeaks(h, radii, 'nhoodxy', 15, 'nhoodr', 21, 'npeaks', 10); imshow(im); hold on; for peak = peaks [x, y] = circlepoints(peak(3)); plot(x+peak(1), y+peak(2), 'g-'); end hold off

[Anton Riyanto]

you should convert image into grayscale im = rgb2gray(imread('coins.png'));