彩色高反光表面自适应编码条纹投影轮廓术  

Adaptive Coding Fringe Projection Profilometry on Color Reflective Surfaces

作　　者：王颖 倪育博 孟召宗 高楠[1] 郭彤[2] 杨泽青[1] 张国锋[3] 尹伟[4] 赵洪伟 张宗华[1] Wang Ying;Ni Yubo;Meng Zhaozong;Gao Nan;Guo Tong;Yang Zeqing;Zhang Guofeng;Yin Wei;Zhao Hongwei;Zhang Zonghua(School of Mechanical Engineering,Hebei University of Technology,Tianjin 300401,China;School of Precision Instrument and Optoelectronics Engineering,Tianjin University,Tianjin 300072,China;School of Mechanical Engineering,Xi’an Jiaotong University,Xi’an 710049,Shaanxi,China;National Key Laboratory of Strength and Structural Integrity,Aircraft Strength Research Institute of China,Xi’an 710065,Shaanxi,China)

机构地区：[1]河北工业大学机械工程学院,天津300401 [2]天津大学精密仪器与光电子工程学院,天津300072 [3]西安交通大学机械工程学院,陕西西安710049 [4]中国飞机强度研究所强度与结构完整性全国重点实验室,陕西西安710065

出　　处：《光学学报》2024年第7期74-82,共9页Acta Optica Sinica

基　　金：国家自然科学基金(U2341275,52075147)。

摘　　要：条纹投影轮廓术广泛应用于重建物体表面三维形貌。但当测量彩色高反光表面物体时,受环境光照及投影条纹反射的影响,存在相机所采集图像像素过饱和,进而无法测量高反光区域表面三维数据的难题。为解决此问题,本文利用物体表面对不同颜色光反射特性的差异,提出了一种根据被测彩色物体表面色彩分布的自适应编码高反光表面条纹投影轮廓术。该方法通过向高反光区域投射与表面颜色互为补色的颜色光,利用物体对互补色光的高吸收、低反射现象,抑制表面高光的形成,从而实现高反光彩色物体的三维形貌测量。实验结果表明,与多重曝光方法相比,利用单幅自适应颜色编码能够替代多次曝光时间设置下的条纹投影重建,有效降低了投影图像的数量,提高了测量效率。Objective Fringe projection profilometry is widely employed to reconstruct the three-dimensional(3D)shape of an object surface.However,when this method is utilized to measure objects with color reflective surfaces,the image captured by the camera is oversaturated with pixels due to ambient lighting and reflections from the projected fringes,which results in the inability to measure the surface of the reflective area.This problem is mainly due to the unevenly varying reflective of surfaces,which is affected by both the roughness and the surface color.To solve the problem of eliminating the interference of the object surface color and complete the 3D shape measurement method based on the reflectivity change of colored highly reflective surfaces,we propose an adaptive generation of complementary color sinusoidal fringes method.By different absorption of colors by the object surface color to be measured,a complementary color of lighting is projected onto the highly reflective area to reduce the surface reflectivity of the region and suppress the exposure phenomenon.Methods We put forward a method to measure the 3D shape of colored objects with high reflectivity,which is based on adaptively encoded complementary color fringes.Firstly,the highly reflective region of the object to be measured should be located.The image of the object surface is captured by the camera when the projector projects the strongest white light,and the coordinates of the oversaturated pixel points are extracted by an inverse projection technique.The location of the highly reflective region in the coordinate system of the projected image is obtained via the matching relationship between the projector and the camera.Then,the optimal color adopted for projecting the highly reflective region of the object is calculated by the color image of the object surface and then captured by the camera.The projecting color obtained in the previous step is employed to generate an image that is projected to the highly reflective region on the measured surface.Th

关 键 词：三维测量 条纹投影 高反光物体表面 颜色编码 

分 类 号：TH741[机械工程—光学工程]