How to detect an image border programmatically?

Question

I\'m searching for a program which detects the border of a image, for example I have a square and the program detects the X/Y-Coords

Example:

alt text http://img

Answer 1

You can use any image processing library such as Opencv. which is in c++ or python. You should look for edge detection functions such as Canny edge detection. Of course this would require some diving into image processing. The example image you gave should be straight forward to detect, how noisy/varied are the images going to be?