[megabuh]

Hi,
please can somebody help me with circle detection (center and radius) in color image (ring, coin,...) In image is only coin or ring.

Thanks to everyone

[SwiftStriker00]

Are you trying to find circles in a image file?

[rules] [/rules]

This post has been edited by SwiftStriker00: 19 January 2010 - 09:21 AM

[megabuh]

Yes,
I´m trying to find circle in image file.
This isn´t a homework. It is my hobby.
I have more images with coins (1 coin in image file).
I had wrote an algorithm for transform the coin (ring) into the cartesian coordles (circle -> plain).
But I need for this algorithm x and y coordles of the center and radius. (So i must this data send to the algorithm myself).
So now I need to auto-detect the circle (center and radius) But I don´t know how to do it.

Thank you

[SwiftStriker00]

One way will be is to have an algorithm itterate throught the pixels, setting that pixel to the given point and your going take a breadth first seach that will conitue to grow for some given param, untill you find like a majority of silver pixels

[finaiized]

Easier to use a image library like AForge.Net and use a Blob object.

[megabuh]

Yes, BlobObject is good. But How can I detect with it a circle?
Rectangle I can, but circle?

Thanks