Detect the Centers for the circles

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Pankaja Tanjore
Pankaja Tanjore 2015-7-29
Hello ,
I have this image. I need to find the center of the four holes that is marked with Red.(InputImage.png)
I applied some image processing algorithms to preprocess the image.Then apply canny edge detection algorithm to detect the edges(CannyEdge.png).
I simplified the image so that only four holes are retained.I have marked this four holes with red line.
I used imfincircles() to find the center and radius.But as they are not circular i am not able to detect these.
[centers, radii] = imfindcircles(bw2,[40 160],'Sensitivity',0.88,'ObjectPolarity','dark');
%corail Trilogy
[h,x,y]=viscircles_1(centers, radii,'EdgeColor','b');
It would be grateful if you let me know the method to find the centers for these circles.
Looking forward to hear from you at the earliest.
Thanks
Pankaja

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