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December 3rd, 2010, 12:54 AM   #1
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Find plane angle from pictures

Hi all.

I need to get some information about plane position and camera position from a pictures.
I have i plane with 3 points (red,green,blue) and then their coordinates inside the image.
Using circle and string I was able to get the y rotation of the plane where the points are on (the rotation of point of view)
But now I need the x rotation of the plane (the up/down angle that the camera taken the picture).
But I'm not able to find a way to get it.

This is an image of the angle I need
http://img408.imageshack.us/i/dim01.jpg/

For example this image have a x angle of around 90 (top view)
http://img41.imageshack.us/i/dscf0179a.jpg/

While this have an x angle of around 30
http://img222.imageshack.us/i/dscf0177n.jpg/


Any ideas?

Thanks.


Ps:the 3 points on the plane are disposed as a regular triangle.
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