I explain the problem. For example, I have a rotated square like a diamond , and I want to have the square in a original position as you can see your laptop's screen for example, http://pullmonkey.com/tag/gems/ and the result I want http://jwilson.coe.uga.edu/emt725/SqT.... So the first step I think is the best one is detect the borders of the image using a filter and after rotating the image basing on, for example, the left border. and putting it vertical to the bottom of the screen.
This forum is disabled, please visit https://forum.opencv.org