Thread Subject:

How to identify hollow circles in a picture?

Assume the circles have different colors, different sizes, are having different background color, may have shadow.

The only thing guaranteed is no circle overlap other circle.

I need to find the center of each circle. How I should approach the question??
  

On May 24, 1:50 pm, "Marco Wu" <alwaysma...@hotmail.com> wrote:
> Assume the circles have different colors, different sizes, are having different background color, may have shadow.
>
> The only thing guaranteed is no circle overlap other circle.
>
> I need to find the center of each circle. How I should approach the question??

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The first step, assuming you want help from us, is to post your image
somewhere - your favorite free image hosting web site, such as
tinypic.com. Other than that all I can guess is that you might want
to try color segmentation or hough transform, followed by labeling and
regionprops.
-ImageAnalyst