Machine Vision
Need some help
One efficent way to simultaneously test for the presence and orientation of lines in an image is called the hough line transform. You'll likely want to run an edge detector over the image first, then use the hough transform. You can find good information on it through google. here is a decent one: http://en.wikipedia.org/wiki/Hough_transform. It might seem confusing at first, but it is actually very simple and it is easy to implement, and it works like a charm. Just reply if you need additional help.
