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Finding projection transform

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I have the following problem.  Suppose I have a 3D triangle in world coordinates, and I know their corresponding projected image coordinates.  Is it possible to find the view and projection transform?  

The image points are actually found by feature point detection algorithm, which is why I do not know the view/proj matrices.  But I want to project more 3D points, which is why I need to solve/approximate the view/projection matrices.  

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You generally need the images of 5 points to determine a projective transformation, since a projective frame for a 3-dimensional projective space has 5 points.

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I might be able to get 5.  Do you have a link for solving for this projective frame?

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