关键词: 立体匹配, rank变换, 改进rank变换, 色差梯度

Abstract: A new stereo matching approach based on matching primitives from improved rank transform about color image is proposed.This algorithm extends the rank transform ideas and proposes a new rank transform equation by color similarity measures with absolute-value exponent method to solve the problems such as image noise and brightness difference in stereo images.Then，by adding chromatic gradient constrain，disparity image is done by a color image which is transformed into improved rank image.The experimental results show that this algorithm can obtain more precise disparity map，which demonstrates the practical value of the algorithm.

Key words: stereo matching, rank transform, improved rank transform, chromatic gradient