Abstract: An improved algorithm for corner detection was proposed by analyzing the theory of Harris operator and its disadvantage. The main improved aspects were suggested just as follows ; First, the new grads operators were used to get image derivative. Second, the method adopted improved corner response function for avoiding the randomicity of k value. Then this algorithm automatically ascertained corner extraction threshold based on the first one in image sequence.Last, in order to improve the precision for corner extraction, the method obtained sub-pixel corners within 8 neighborhoods of the target pixel. Experiment results show that the computation time of improved algorithm enhances about 61. 3% , and it can be applied to image mosaic better.

Key words: Image mosaic, Corner detection, Harris operator, Corner response function