光学精密工程2013，Vol.21Issue(1)：7-12,6.DOI:10.3788/OPE.20132101.0007
基于双频彩色光栅投影测量不连续物体三维形貌
Three-dimensional shape measurement of objects with discontinuities by dual-frequency color fringe projection
摘要
Abstract
To reduce the projection fringes in three dimensional profile measurement by traditional phase shift method and to improve the measuring speed, a dual-frequency and 4-step phase-shifting color fringe profilometry is proposed to measure the 3-D shapes of objects with step-jumps and discontinuous shapes. Dual-frequency color fringe patterns with 4-steps phase-shifting are generated by computer encoding with four low-frequency and high-frequency sinusoidal fringe patterns. These color fringe patterns are projected onto the tested objects by a digital video projector, and the deformed fringe patterns are captured by a color CCD/CMOS camera and stored into a computer. Then, the recorded fringe patterns are separated into their RGB components and become 8 frames of fringe patterns. One image related to the background is also obtained by the sum of four dual-frequency color fringe patterns. The shapes of tested objects are acquired from high-frequency fringe patterns, and the ambiguous phase jumps caused by steps are eliminated by using low-frequency fringe patterns. To determine the shadow and dark background, the image related to the background is binarized and used for correcting the phase extraction. The experimental results verify that the proposed method can measure exactly the step-jumps and discontinuous shapes with only four images. Compared with existing methods, the presented method can effectively reduce the quantity of information of fringe projection and image acquisition.关键词
三维形貌测量/彩色双频条纹投影/相位解包裹/台阶状不连续物体Key words
3D shape measurement/ dual-frequency color fringe projection/ phase unwrapping/ object surface with steps or discontinuities分类
通用工业技术引用本文复制引用
戴美玲,杨福俊,何小元..基于双频彩色光栅投影测量不连续物体三维形貌[J].光学精密工程,2013,21(1):7-12,6.基金项目
江苏省高校优势学科建设工程资助项目 （）
国家自然科学基金资助项目(No.10972054,10972055) （No.10972054,10972055）
