Feature Based Stereo Matching Using Two-Step Expansion. (18th December 2014)

• Record Type: Journal Article
• Authors: Wang, Liqiang; Liu, Zhen; Zhang, Zhonghua
• Other Names: Chen Yi Academic Editor.
• Is Part Of: Mathematical problems in engineering. Volume 2014(2014)
• Publication Date: 2014-12-18
• Subjects: Engineering mathematics -- Periodicals; 510.2462
• DOI: 10.1155/2014/452803
• Languages: English
• ISSNs: 1024-123X

Abstract

Abstract : This paper proposes a novel method for stereo matching which is based on image features to produce a dense disparity map through two different expansion phases. It can find denser point correspondences than those of the existing seed-growing algorithms, and it has a good performance in short and wide baseline situations. This method supposes that all pixel coordinates in each image segment corresponding to a 3D surface separately satisfy projective geometry of 1D in horizontal axis. Firstly, a state-of-the-art method of feature matching is used to obtain sparse support points and an image segmentation-based prior is employed to assist the first region outspread. Secondly, the first-step expansion is to find more feature correspondences in the uniform region via initial support points, which is based on the invariant cross ratio in 1D projective transformation. In order to find enough point correspondences, we use a regular seed-growing algorithm as the second-step expansion and produce a quasi-dense disparity map. Finally, two different methods are used to obtain dense disparity map from quasi-dense pixel correspondences. Experimental results show the effectiveness of our method.