Abstract: This paper introduces the principle of SIFT algorithm to extract the feature points, and uses
SIFT algorithm to extract mosaic image feature point. In the fusion step, put forward an improved
fusion algorithm based on weighted average method of image fusion, and use the image information
entropy to analyze the results. The experimental results show that the improved fusion algorithm has
better effect. Finally achieved image stitching.

Key words: image stitching, SIFT, image fusion, improved image fusion algorithm