Compute Perspective Transformation Matrix

[ghost]

Hey guy, thanks for your nice work.
But the perspective image may be not perfect due to installation pose of camera.
So, how could I tune the parameters in function ComputePerspectiveTransformationMatrix() when camera moved?
Thanks again.

[rAum]

The easiest way is to write a small app that displays transformed image and draw corners in different colors so you can see where they are in transformed image.
You can also prepare a scene with reference points that can help you find parameters.