投影栅三维形面测量中亚像素匹配算法  

Sub-pixel matching algorithm for projected grating 3-D surface measurements

作　　者：张吴明[1] 钟约先[2] 李仁举[3] 

机构地区：[1]北京师范大学地理学与遥感科学学院,遥感科学国家重点实验室,北京100875 [2]清华大学机械工程系,先进成型制造教育部重点实验室,北京100084 [3]北京大学视觉与听觉信息处理国家重点实验室,北京100871

出　　处：《清华大学学报（自然科学版）》2008年第3期412-414,共3页Journal of Tsinghua University(Science and Technology)

基　　金：国家“八六三”高技术项目(2003AA134040);长江学者和创新团队发展计划

摘　　要：根据相位值寻找匹配点是投影栅三维形面测量系统的关键技术之一,匹配精度在一定程度上决定了系统最终的三维重建精度,而整像素匹配无法满足高精度三维形面测量的需要。根据相邻像素相位近似线性分布的特点,提出了一种基于相位线性插值的亚像素匹配算法。模拟实验表明:应用该匹配算法后,三维重建测量精度有很大提高,匹配速度很快。验证实验显示:应用该匹配算法后投影栅三维形面系统的测量精度可达0.03mm,能够满足一些高精度测量需求。Phase-based matching is a key technique for optical measurements using projected grating pattern analysis. The matching accuracy determines the final 3-D reconstruction accuracy. However, the reconstruction accuracy of integer-pixel matching is relatively low. A sub-pixel matching algorithm was developed based on phase linear interpolation assuming a linear phase distribution between adjacent pixels. Simulation results indicate that the proposed sub-pixel matching algorithm improves the final 3-D reconstruction accuracy with high processing speed. Verification experiments show that the accuracy can reach 0. 03 mm. A 3-D surface measurement system utilizing the sub-pixel matching algorithm can provide very high accurancy.

关 键 词：投影栅 三维形面测量 亚像素 相位线性插值 

分 类 号：O29[理学—应用数学] TB11[理学—数学]