How to identify object inside an image and find its position in that image

I have 3 circles of same size with colours yellow blue and red inside the image.I would like to identify coloured circles inside an image and get their positions in terms of x and y coordinates.

[Matt Kindig]

Post the image to the web somewhere (e.g. tinypic.com), and post the link to it here. That will help us give you specific information.

Answer 1

[Image Analyst]

See my Image Segmentation Tutorial: BlobsDemo - it does that using the standard coins demo. There is also a Mathworks demo on Steve's blog using imfindcircle: http://blogs.mathworks.com/steve/2012/09/04/detecting-circular-objects-in-images/

Answer 2

[Anand]

I think this blog post by Steve Eddins should be directly relevant to what you're trying to achieve:

Detecting circular objects in images

[Haseeb Hassan]

If i want to to detect humans and want to find there coordinates in gray image then what should i do.

[Image Analyst]

See "Multiple Object Tracking Framework" on this page: https://www.mathworks.com/products/computer-vision/features.html#object-tracking-and-motion-estimation