TY - CONF T1 - Tracking rigid motion using a compact-structure constraint T2 - Computer Vision, 1999. The Proceedings of the Seventh IEEE International Conference on Y1 - 1999 A1 - Yacoob,Yaser A1 - Davis, Larry S. KW - compact-structure constraint KW - image motion KW - Image sequences KW - Motion estimation KW - parameterized flow models KW - polynomial parameterized flow models KW - Polynomials KW - rigid motion tracking KW - rigid object KW - rigidly moving objects KW - structure-compactness constraint KW - tracking AB - An approach for tracking the motion of a rigid object using parameterized flow models and a compact-structure constraint is proposed. While polynomial parameterized flow models have been shown to be effective 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 planar structure. The constraint is based on the assumption that object structure variations are limited with respect to planar object projection onto the image plane and therefore can be expressed as a direct constraint on the image motion. The performance of the algorithm is demonstrated on several long image sequences of rigidly moving objects JA - Computer Vision, 1999. The Proceedings of the Seventh IEEE International Conference on VL - 1 M3 - 10.1109/ICCV.1999.791218 ER -