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The *affine camera* is a special case of the projective camera and is
obtained by constraining the matrix such that
, thereby reducing the degrees of
freedom from 11 to 8:

In terms of image and scene coordinates, the mapping takes the form

where is a general matrix with elements
while is a general 2-vector
representing the image center.
The affine camera preserves parallelism.

Subhashis Banerjee
2002-02-18