February 3rd, 2012, 03:47 AM  #1 
Newbie Joined: Feb 2012 Posts: 2 Thanks: 0  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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