彩色栅线动态三维测量中自适应相关匹配技术  

Matching Technique of Self-Adaptation Correlation in Dynamic Three-Dimensional Measurement by Color Grating

作　　者：韦争亮[1] 钟约先[1] 袁朝龙[1] 

机构地区：[1]清华大学机械工程系先进成形制造教育部重点实验室,北京100084

出　　处：《光学学报》2009年第4期949-954,共6页Acta Optica Sinica

摘　　要：彩色栅线结构光三维测量可仅靠左右摄像机单幅图像完成像素级相位匹配,能够实现运动或者变形物体型面重构,但其测量精度有待进一步提高。在依据相位进行粗匹配的基础上,采用立体视觉数字相关技术在左右图像局部区域进行更细致的匹配。计算相关系数时,依据彩色栅线各个周期的色彩变化特性自适应调整不同颜色通道的权重,依据不同视点表面变形特性自适应调整左右相关窗口的尺寸。在极线方向上双线性插值进行亚像素匹配。实验结果证明自适应数字相关匹配技术在保证彩色栅线动态检测,分辨率高优点的同时,可有效改善测量精度至0.1 mm,扩大测量适用范围。Three-dimensional measurement of structured light of color grating can complete phase match of pixel between single image in left and right cameras. It can realize the reconstruction of surface of objects that move or deform, but the measurement accuracy needs to be improved. Based on the coarse match by phase, more accurate match can be achieved in local region by digital correlation technique of stereo vision between left and right images. As calculating the correlation coefficient, the weights in different color channels are self-adapted according to the color variety feature in different period of color grating and the dimension of correlation windows in left or right is self-adapted according to surface distortion feature from different view. The sub-pixel matching is achieved by bilinear interpolation along the direction of epipolar line. The experimental results prove that the matching technique of self-adaptation digital correlation can improve the accuracy of measurement effectively, and expand the range of application while maintaining the advantages of dynamic measurement and high resolution.

关 键 词：结构光 动态三维测量 彩色栅线 自适应相关 

分 类 号：O29[理学—应用数学] TB11[理学—数学]