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Definition of "projective invariant" |
a measure that is independent of the distance and direction from which a particular class of object is viewed, under perspective projection. The cross ratio is an important type of projective invariant, which is constant for four collinear points viewed under perspective projection from anywhere in space. Projective invariants are important in helping with egomotion (e.g., automatic guidance of a vehicle) and for initiating the process of object recognition in 3-D scenes. |
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