Error analysis of combined stereo/optical-flow passive ranging

Details Error analysis of combined stereo/optical-flow passive ranging Error analysis of combined stereo/optical-flow passive ranging

Aug 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991spie.1479..259b&link_type=abstract

In: Surveillance technologies; Proceedings of the Meeting, Orlando, FL, Apr. 2-5, 1991 (A93-27712 09-35), p. 259-267.

Other

Error Analysis, Obstacle Avoidance, Optical Flow, Rangefinding, Stereoscopy, Look Angles (Tracking), Nap-Of-The-Earth Navigation, Space Perception

Scientific paper

The motion of an imaging sensor causes each imaged point of the scene to correspondingly describe a time trajectory on the image plane. The trajectories of all imaged points are reminiscent of a flow (e.g., of liquid) which is the source of the term 'optical flow'. Optical-flow ranging is a method by which the stream of two-dimensional images obtained from a forward-looking forward-moving passive sensor is used to compute depth (or range) to points in the field of view. Another well-known ranging method consists of triangulation based on stereo images obtained from at least two stationary sensors. In this paper we analyze the potential accuracies of a combined optical flow and stereo passive-ranging system in the context of helicopter nap-of-the-earth obstacle avoidance. The Cramer-Rao lower bound is developed for the combined system under the assumption of an unknown angular bias error common to both cameras of a stereo pair. It is shown that the depth accuracy degradations caused by a bias error is negligible for a combined optical-flow and stereo system as compared to a monocular optical-flow system.

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