Question
Define the following projection-invariant shape descriptors:(a) Cross ratio(b) System of four co-planar concurrent lines(c) System of five co-planar concurrent lines(d) System of five co-planar points(e) Plane conics
Step 1
It is given by the formula: \[ CR(A, B, C, D) = \frac{(A - C)(B - D)}{(A - D)(B - C)} \] This ratio remains unchanged under projective transformations, making it a useful descriptor in projective geometry. Show more…
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