Using stability of interpretation as verification for low levelprocessing: An example from egomotion and optic flow
Bobick, A.F.
MIT Media Lab., Cambridge, MA;
Abstract
A method is presented for validating low level optic flow
computations in an image sequence by a simple analysis of the stability
of the three-dimensional interpretation of the scene. Given computed
optic flow and known egomotion, a viewer centered depth image is
computed. By warping a finite history of previous depth images to the
current viewer-centered system, the stability of the depth estimate at
each point is analysed. Regions of low stability indicate image regions
where the low level optic flow computation is unreliable. It is proposed
that this approach is an example of performing verification mode vision,
i.e., simple low-level computations are adequate when the interpretation
provided is consistent with respect to the current scene interpretation
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