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In view of the problem that the excessive iterations lead to the bad effect of image mosaic,an improved RANSAC image mosaic algorithm is proposed to solve the shortcoming.First,SIFT algorithm is used to extract scale invariant feature points.We use the way of interaction matching strategy to match feature points.Before calculate homography in use of the RANSAC algorithm,we select the initial feature points according to the relationship between the adjacent feature points. Finally,we use the weighted smoothing method to complete the image fusion.The experimental results show that this method is effective in reducing the number of feature points and improving the running time of RANSAC,Image Stitching efficiency has been improved greatly.