homography

4-point transform images

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, wh...

Projection matrix + world plane ~> Homography from image plane to world plane

I think I have my wires crossed on this, it should be quite easy. I have a projection matrix from world coordinates to image coordinates (4D homogeneous to 3D homgeneous), and therefore I also have the inverse projection matrix from image coordinates to world "rays". I want to project points of the image back onto a plane within the wo...

How to get homography matrix in such case? (from one still image)

In my case as input I have such data structures: original image (RGB pixels), objects (squares) with lines crossing points in pixels (x,y) on Image Plane. I have image like this In my particular case the Image Plane has 3 quadrilaterals - projections of real world squares, which, as we know, have same size, lying on the same plane, w...