光学学报, 2018, 38 (8): 0815008, 网络出版: 2019-05-09
基于自适应条纹投影的彩色物体三维形貌测量 下载: 1053次
Three-Dimensional Shape Measurement of Colored Objects Based on Adaptive Fringe Projection
机器视觉 自适应条纹投影 三维形貌测量 彩色物体 相位测量 machine vision adaptive fringe projection three-dimensional shape measurement colored objects phase measurement
摘要
针对三维形貌测量技术中彩色物体表面反射率的非均匀性影响测量结果的问题,提出一种基于自适应条纹投影的三维形貌测量技术,该方法可避免彩色物体表面反射率非均匀的影响,提高系统的测量精度。彩色相机采集RGB光强图像,并根据物体表面颜色的反射特性计算每个像素点的最优投射光强和颜色;采集水平和垂直的正弦条纹序列,利用计算所得绝对相位值将相机图像坐标系中每一个像素点的最优投射光强和颜色映射到投影仪像素坐标系;投射自适应条纹序列进而测量彩色物体的三维形貌。实验结果表明,该方法能够有效测量彩色物体三维形貌,具有很高的测量精度。
Abstract
An adaptive fringe projection method is proposed to avoid measurement errors, which is caused by non-uniform surface reflectivity of colored objects, and to enhance accuracy of a 3D measurement system. RGB images are captured by a camera, and optimal color and intensities at each pixel are calculated according to reflectivity characteristics. A set of horizontal and vertical fringe patterns are captured and the corresponding absolute phase are calculated. Optimal color and intensities at each pixel in the camera pixel coordinate system are transformed into the projector coordinate system by using calculated absolute phase. The adapted fringe patterns are projected by projector for measuring object's 3D shape. Experimental results demonstrate that the proposed method can effectively measure the 3D shape of colored objects and has high measurement accuracy.
陈超, 高楠, 王向军, 张宗华. 基于自适应条纹投影的彩色物体三维形貌测量[J]. 光学学报, 2018, 38(8): 0815008. Chao Chen, Nan Gao, Xiangjun Wang, Zonghua Zhang. Three-Dimensional Shape Measurement of Colored Objects Based on Adaptive Fringe Projection[J]. Acta Optica Sinica, 2018, 38(8): 0815008.