关键词: 特征点, 特征描述符, 特征匹配, 方向估计

Abstract: Extracting descriptors of interest points is a fundamental task in feature based image matching.In this paper，points out the shortcomings of some existing feature descriptors，and proposes a new feature descriptor extracting and matching approach.Performance evaluations show that this new descriptor provides higher distinctiveness and robustness to image rotate，scale and gray change.Meanwhile，proposes a new approach to compute dominant directions，which perform better than existing approaches.

Key words: interest points, local descriptor, matching, dominant direction