How to specify 2-D coordinates of an object?

This is the scenario: I marked two axis (figure below) on a board and a camera(global vision system) sees the board. I want to make the vision system to recognize X and Y axis and specify coordinates of an object (preferably a colored one )in the form of (x,y). How can I do that? is there any functionality in matlab to help me?

Answer 1

[Image Analyst]

You can do color segmentation to get the red, black, brown, and blue pixels. You get a binary image that is essentially a map of where those color pixels are in the image. Then use find() on the binary image to get the x and y coordinates of every pixel of that color.

That said, I don't think you described your problem precisely enough so I don't think my answer is what you want, though it does what you asked.

[Ali Tareq]

Thanks for your help. the question has been edited. I think it's now more clear.

[Image Analyst]

See my Image Segmentation Tutorial. It goes over how to find centroids of objects in an image. http://www.mathworks.com/matlabcentral/fileexchange/?term=authorid%3A31862