4-point transform images

Question

I need to transform bitmap images with their 4 corner points moved from one location to another.

Any code that can run on Windows, C#/VB.NET preferably, even help how to use scriptable programs like Paint.NET or Photoshop would be accepted. The Java Advanced Imaging API sounds hopeful.

I need it for a screenshot manipulation system, which allows you to get such effects:

_{(source: wholetomato.com)}

Answer 1

Check out the Perspective warping examples from ImageMagick. It is available for most mainstream platforms.

Answer 2

The keyword here is homography. Manolis Lourakis has written a GPL'ed homography implementation in C that is available here; however, this will not be able to be ported very easily because it relies on some external libraries such as LAPACK.