一种新型单帧彩色复合光栅投影的实时三维测量方法  

A Real-Time 3D Measurement Method Based on New Single-Shot Color Composite Grating Projection

作　　者：黄修章 曹益平[1] 张玉娇 HUANG Xiu-zhang;CAO Yi-ping;ZHANG Yu-jiao(College of Electronics&Information Engineering,Sichuan University,Chengdu 610065,China)

机构地区：[1]四川大学电子信息学院,四川成都610065

出　　处：《光学与光电技术》2021年第3期33-40,共8页Optics & Optoelectronic Technology

基　　金：国家重大专项(2009ZX02204-008)资助项目。

摘　　要：提出了一种新型单帧彩色复合光栅投影的实时三维测量方法。采用三帧具有π2的相移正弦条纹分别编码到红色(R)、绿色(G)和蓝色(B)三个颜色通道中,组合成单帧彩色复合光栅,当该彩色复合光栅投影到待测物体上,仅需获取单帧彩色变形条纹并从中分离出相应的具有π2相移的三帧单色相移变形条纹,由于不同颜色通道之间存在颜色串扰以及色度不均衡问题,采用最小二乘法对分离出的三帧单色相移变形条纹直流项进行背景一致性校正,从而获得三帧校正后的单色相移变形条纹,运用所建立的三维重构物理模型,即可恢复物体的三维形貌。实验验证了该方法的可行性和实用性。进一步的实验表明,该方法的测量精度优于传统单帧彩色PMP。因为所提方法仅需一帧彩色复合光栅即可恢复物体的三维形貌,在实时三维测量中具有很好的应用前景。A new real-time three-dimensional(3D) shape measurement based on single-shot color composite grating projection is proposed. In the methods,the three frames of phase-shifting sinusoidal gratings with a shifted phase of π 2 are respectively coded into the red(R),green(G)and blue(B)channels to form a single-shot color composite grating.When this color composite grating is projected to the object,only a single frame of color deformed pattern is needed to capture. By color separating method,the corresponding three-frames of monochrome phase-shifting deformed patterns with a shifted phase of π 2 can be demodulated. Due to the color crosstalk and chromaticity imbalance among the three color channels,the least square method for DC component of the three frames of monochrome phase-shifting deformed patterns is used to correct the background consistency,so as to obtain the three-frame corrected monochrome phase-shifting deformed patterns. Using the established 3D reconstruction physical model,the 3D shape of the object can be restored. The experimental results verify the feasibility and practicability of the proposed method. Further experimental results show that the measurement accuracy of the proposed method is better than that of the traditional single-frame color PMP. Because the proposed method only needs one frame of color composite grating to reconstruct the 3D shape of the measured object,it has a good application prospect in real-time 3 D measurement.

关 键 词：光学三维测量 实时三维测量 彩色复合光栅 颜色串扰 背景校正 

分 类 号：TP391[自动化与计算机技术—计算机应用技术]