Abstract
A method of obtaining local projective and affine invariants that
is more robust than existing methods is presented. These shape
descriptors are useful for object recognition because they eliminate the
search for the unknown viewpoint. Being local, these invariants are much
less sensitive to occlusion than the global ones used elsewhere. The
basic ideas are (i) using an implicit curve representation without a
curve parameter, thus increasing robustness; and (ii) using a canonical
coordinate system which is defined by the intrinsic properties of the
shape, regardless of any given coordinate system, and is thus invariant.
Several configurations are treated: a general curve without any
correspondence, and curves with known correspondence of feature points
or lines
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