Abstract
We present an approach for identifying the occluding contour and
determining its sidedness using an active (i.e., moving) observer. It is
based on the non-stationarity property of the visible rim: When the
observer's viewpoint is changed, the visible rim is a collection of
curves that “slide,” rigidly or non-rigidly over the
surface. We show that the absenter can deterministically choose three
views on the tangent plane of selected surface points to distinguish
such curves from stationary surface curves (i.e., surface markings). Our
approach demonstrates that the occluding contour can be identified
directly, i.e., without first computing surface shape (distance and
curvature)
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