基于SGM和相位相关的小基高比影像匹配  

Smallbaseline stereo matching method based on SGM and phase correlation

作　　者：申二华[1] 范大昭[1] 孙晓昱[1] 

机构地区：[1]信息工程大学地理空间信息学院,河南郑州450000

出　　处：《中国矿业大学学报》2015年第1期183-188,共6页Journal of China University of Mining & Technology

基　　金：国家高技术研究发展计划(863)项目(2012AA12A302-5);国家自然科学基金项目(40901230)

摘　　要：研究了小基高比条件下的高精度影像匹配算法,采用半全局匹配算法(SGM)获取初始视差,以初始同名像点为中心开窗并计算互功率谱矩阵,对互功率谱矩阵进行2倍上采样,对上采样后的互功率谱矩阵进行逆傅里叶变换,计算极值位置获取进一步的视差估计.在此基础上,对上一步骤得到的极值取一定邻域内互功率谱矩阵进行K倍上采样和逆傅里叶变换,计算极值位置并加上上一步骤得到的视差,获得最终的高精度匹配结果.如果得到的视差与半全局匹配得到的视差相减小于阈值(可设为2),则认为正确匹配,否则视为错误匹配.采用小基高比模拟立体像对和Pleiades卫星立体像对进行实验.结果表明:提出的算法在一定条件下可获得高精度的匹配结果和可靠的高程精度.The small baseline stereo matching method with high precision is studied.In the algorithm,the semi-global matching is firstly adopted for the initiate parallax.Secondly,the cross power spectrum matrix of the window pixels centering in the corresponding points is computed.Then the cross power spectrum matrix is up-sampled in the ratio of 2,the inverse Fourier transform is done,and then the further parallax is achieved by finding the extremum location.Thirdly,the local cross power spectrum matrix located in a certain domain of the parallax is up-sampled in the ratio of Kand the inverse Fourier transform is done.Then,the final matching results are achieved by finding the extremum location and plusd by the parallax based on the previous step.If the final parallax minus the parallax by semi-global matching is less than the threshold value（for example 2）,the final parallax is thought to be right,or thought to be wrong.According to the small baseline stereo pairs and the Pleiades satellite stereo pairs,it is demonstrated that the algorithm in this paper is capable of directly measuring the precise parallax and good height accuracy by the experiments.

关 键 词：小基高比 SGM 相位相关 上采样 匹配精度 

分 类 号：P237[天文地球—摄影测量与遥感]