Abstract: The relationships of line parameters between the states before and after planar motion of a rigid body are first deduced. A new algorithm based on the line correspondence for estimating motion parameter is proposed, which can be used to estimate the object's revolving parameters in addition to the object's translating parameters. For the conventional point correspondence algorithm, it is hard to work out all of them at the same time. Furthermore the iterative formula for automatic moving object tracking is presented as well. The homogeneous coordinate is adopted to facilitate the complex coordinate system transfer plus motion synthesis along the tracking process. The simulating experiments show that the quite accurate results under the high noisy environment can be acquired by this algorithm.

Key words: motion estimation, line correspondence, object tracking