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An approach for tracking the motion of a rigid object using parameterized ow models and a compact-structure constraint is proposed. While polynomial parameterized ow models have been shown to be e ective in tracking the rigid motion of planar objects, these models are inappropriate for tracking moving objects that change appearance revealing their 3D structure. We extend these models by adding a structure-compactness constraint that accounts for image motion that deviates from a planardoi:10.1109/iccv.1999.791218 dblp:conf/iccv/YacoobD99a fatcat:xxftgbgmcjg7bka5wcwwxhedeu