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Traditional methods of optical flow estimation are poor in uneven brightness variation environment .This thesis solves this problem by generalized dynamic image model (GDIM). And according to the combination of the rich color information in color images and generalized dynamic image model, a model of color image sequence optical flow computation is presented in this paper. And the model presented is compared with the traditional method that is color brightness consistency method. The number experiment results are presented ,and the results of the experiments indicate that the optical flow field caculated from color GDIM model is better than the traditional brightness constancy model.