3-D shape measurement by composite pattern projection and hybrid processing.
3-D shape measurement by composite pattern projection and hybrid processing.
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DOI：
10.1364/oe.15.012318
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发表时间：
2007-09
期刊：
影响因子：
3.8
通讯作者：
Huijun Chen;Jiazhi Zhang;Dongjiao Lv;Jing Fang
中科院分区：
文献类型：
--
作者：
Huijun Chen;Jiazhi Zhang;Dongjiao Lv;Jing Fang
本文提出了一种具有新颖复合模式的投影系统，用于一次性获取三维曲面形状。图案由彩色编码条纹和圆锥条纹组成，平行排列。条纹边缘提供高精度的绝对高度相位，圆锥条纹提供丰富的强度分布相关相位。利用小波变换获得条纹图样的相对相位分布，结合三角测量得到的绝对高度相位对解包裹时的相位数据进行标定，消除初始误差和噪声误差，减小累积误差和近似误差。通过数值仿真验证了该算法的有效性，并进行了实际实验，验证了该算法对三维形状测量的准确性。
This article presents a projection system with a novel composite pattern for one-shot acquisition of 3D surface shape. The pattern is composed of color encoded stripes and cosinoidal intensity fringes, with parallel arrangement. The stripe edges offer absolute height phases with high accuracy, and the cosinoidal fringes provide abundant relative phases involved in the intensity distribution. Wavelet transform is utilized to obtain the relative phase distribution of the fringe pattern, and the absolute height phases measured by triangulation are combined to calibrate the phase data in unwrapping, so as to eliminate the initial and noise errors and to reduce the accumulation and approximation errors. Numerical simulations are performed to prove the new unwrapping algorithms and actual experiments are carried out to show the validity of the proposed technique for accurate 3- D shape measurement.