detect circle between some shapes

hi,in my image has some shapes(circle,square,triangle) . how can I detect circle between other shapes? and can tell me how many circle there is in my image.thanks in advance

Answer 1

[Image Analyst]

Have you tried imfindcircle() in the Image Processing Toolbox? Otherwise try hough() or somehow find all the objects and extract the circles based on their circularity = perimeter^2 / (4*pi*Area).

[safa]

i wrote my code according imfindcircle() , but it didn't work.

    I = imread('c:\safa\test.bmp');
     b=rgb2gray(I);
     [centers, radii, metric] = imfindcircles(b,[5 30]);
      viscircles(centers, radii,'EdgeColor','b');
     subplot (2,3,1), imshow (b);

[Image Analyst]

You forgot to tell us where you uploaded test.bmp.

[safa]

sorry http://www.irandesa.com/images/banners/test.bmp