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This paper first study the edge detection based on particle swarm optimization algorithm and universal gravitation algorithm in this paper. Using the principle of universal gravitation to calculate the heuristic function, guide the ant colony movement trend, and quickly detect the edge of the line. The detection results can be used as the preprocessing results of image analysis. We propose a global motion estimation based on several small domain data of the image according to the video of the local image motion is concentrated in the central part of the image of greater probability characteristics. In this way the amount of computation can be greatly reduced. We sampled four of 1/6 rectangular area original length in the experiment of global estimation. The experiment proves that the operation speed is increased by about nine times in the same accuracy.