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21 June 2011 A novel color coding method for structured light 3D measurement
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This paper presents a novel color coding method which is applied to structured light measurement using fringe-pattern projections. The method is based on time coding, and reduces the projection times of fringe patterns with the same number of fringes by adding colors into the conventional fringe patterns. But the introduction of colored fringes also brings a difficulty in image processing, that is color crosstalk. To address this problem, sinusoidal fringe patterns with four colors of white, red, green and blue are used to project to the measured object surface to reduce the edge effect. Based on those ideas and methods, a three-dimensional measurement system is built, and the direct linear transform (DLT) method of calibration with lens distortion corrected by cross ratio invariance principle is used to calibrate the internal and external parameters of the system. Then the parameters of the system are optimized by the bundle adjustment method. Finally, a standard metal hemisphere with spraying is measured, and the experimental results show that with the same times of projection, the lateral measurement resolution is higher than the traditional method, and the measurement accuracy of the depth direction is about 0.27mm.
© (2011) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Junhui Huang, Zhao Wang, Zhihua Gao, and Jianmin Gao "A novel color coding method for structured light 3D measurement", Proc. SPIE 8085, Videometrics, Range Imaging, and Applications XI, 808512 (21 June 2011);

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