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<p>from 3D coordinates to 2D image coordinates is given by the expression above, but without the negation, thus</p>

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: </p>

<p><big> In homogeneous coordinates </big></p>
<p>The mapping from 3D coordinates of points in space to 2D image coordinates can also be represented in <a href="page.php?w=homogeneous_coordinates">homogeneous coordinates</a>.  Let  be a representation of a 3D point in <a href="page.php?w=homogeneous_coordinates">homogeneous coordinates</a> (a 4-dimensional vector), and let  be a representation of the image of this point in the</p><p>
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