Computation of Coherent Optical Flow by Using Multiple Constraints

The optzcal floul constitutes one of the most widely adopted representatzons to define and characterzze the evolutzon of image features over time. In order to compute the velocity field, it is necessary to define a set of constraints on the temporal change of image features. In this paper we consider the implications in using multiple constraints arising f rom multiple d a t a points. The first step as the analysis o f diflerential constraints and how they can be applied, locally, t o compute the amage velocity. Thzs analysis allows to relate each constraznt io a particular g r a y Ietiel pattern. This approach is extended t o multiple image points, allowang also the characterization of the temporal behaviour of the image features and to detect erroneous measurements due t o occlusions, depth discontinuities or shadows. Several ezperzments are presented f rom real image sequences.