Method for estimating velocity vector fields from a time-varying

Details Method for estimating velocity vector fields from a time-varying Method for estimating velocity vector fields from a time-varying

1990-12-20

1993-08-31

Boudreau, Leo H.

Image analysis

Histogram processing

For setting a threshold

358105, 364174, 364565, 382 37, 382 41, 382 54, G06K 900

Patent

active

052416089

ABSTRACT:
Changes in successive images from a time-varying image sequence of a scene are characterized by velocity vector fields. As estimate of the velocity vector field is determined as a compromise in the attempt to satisfy the following two sets of constraints in addition to a regularization constraint: the optical flow constraints which relate to the values of the time-varying images function at corresponding points of the successive image of the sequence, and the directional smoothness constraints, which relate the values of the neighboring velocity vectors. To achieve such a compromise, a system of nonlinear equations of the unknown estimate of the velocity vector field is used. A stable iterative method is used to solve this system. The optical flow and smoothness constraints are selectively suppressed in the neighborhoods of the occlusion boundaries. The last is accomplished by attaching a weight to each constraint. The spatial variations in the values of the time-varying image function near corresponding points of the successive images of the sequence, with the correspondence specified by a current estimate of the velocity vector field, and variation in the current estimate of the velocity vectors themselves are implicitly used to adjust the weighting function.

REFERENCES:
patent: 4244026 (1981-01-01), Dickey, Jr.
patent: 4502109 (1985-02-01), Delmege et al.
patent: 4841444 (1989-06-01), Chittineni
patent: 4910608 (1990-03-01), Whiteman et al.

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