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 March 17th, 2011, 03:22 AM #1 Newbie   Joined: Mar 2011 Posts: 2 Thanks: 0 Augmented reality rotation & zoom I'm working on augmented reality engine and I have a following problem. I'm tracking a 2D rectangle tracking picture inside an other picture (webcam stream). I have detected all four 2D corner coordinates for that tracking picture. Now I need to calculate from the corner coordinates how the original tracker picture has rotated (x-,y-,z-rotations) and zoomed. Bare in mind that the coordinates doesn't create right angle quadrilateral. Any ideas how I can do it? Thanks for any advice.
 March 17th, 2011, 06:42 AM #2 Senior Member   Joined: Apr 2007 Posts: 2,140 Thanks: 0 If this is a geometry problem, could you find a mathematics picture by Google?
 March 17th, 2011, 11:30 PM #3 Newbie   Joined: Mar 2011 Posts: 2 Thanks: 0 Re: Augmented reality rotation & zoom Here is a picture that hopefully helps to understand Here is rectangular picture rotated in x-,y- and z-axels. Now I need to calculate how much it has rotated.
 March 18th, 2011, 01:10 AM #4 Senior Member   Joined: Apr 2007 Posts: 2,140 Thanks: 0 Point A (x, y) ? (x + k, y - k) and for point B (x, y) ? (x + k, y) and for point C (x, y) ? (x, y) and for point D (x, y) ? (x, y - k), where k > 0.

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