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February 3rd, 2012, 04:47 AM   #1
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projection?

Hello ,
this is a problem from the real world.

I have a camera , and I took a picture of a pen. I know exactly the pen's dimensions. I know the camera angle of view. I also know the exact x and y coordinates of the two ends and and the middle point of the pen's image in the photo. The coordinate system begins from the center of the image.

How do I find the 3 dimensional coords of the real pen ?

I suppose this is a linear algebra problem , we must find the coords of an object , knowing its perspective projection.
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