1988 | OriginalPaper | Buchkapitel
Bounding Constraint Propagation for Optical Flow Estimation
verfasst von : Joseph K. Kearney, William B. Thompson
Erschienen in: Motion Understanding
Verlag: Springer US
Enthalten in: Professional Book Archive
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The velocity field that represents the motion of object points across an image is called the optical flow field. Optical flow results from relative motion between a camera and objects in the scene. One class of techniques for the estimation of optical flow utilizes a relationship between the motion of surfaces and the derivatives of image brightness (Limb and Murphy, 1975; Cafforio and Rocca, 1976; Fennema and Thompson, 1979; Netravali and Robbins, 1979; Schalkoff, 1979; Lucas and Kanade, 1981; Schunck and Horn, 1981; Thompson and Barnard, 1981; and Schalkoff and McVey, 1982). The major difficulty with gradient-based methods is their sensitivity to conditions commonly encountered in real imagery. Highly textured regions, motion boundaries, and depth discontinuities can all be troublesome for gradient-based methods. Fortunately, the areas characterized by these difficult conditions are usually small and localized.