Detecting and measuring circles

I want to find circles and measure diameter of them. I have a image where the circles have a value of 1 and the background has a value of 0. I would like to do this without any built in functions.

[John BG]

show the image, or part of it, so we can write an answer according to the kind of circles you mention in your question.

Answer 1

[Image Analyst]

Well you'll have to write your own version of either imfindcircles() or bwlabel(), and regionprops(). You might need to threshold your image to binarize it. Then, you can find connected components algorithms on the web to do the labeling of your binary image. To get the diameter, sum of the number of pixels in each blob and use the formula for area. Diameter = sqrt(area*4/pi).

[P]

How would I go about sectioning off each blob from each other?

[Image Analyst]

I don't even know what that means. Do you mean split apart, like a watershed transform? Or do you mean connected components labeling? (Google those terms.)