格雷码
计算机科学
解码方法
编码(社会科学)
计算机视觉
人工智能
稳健性(进化)
投影机
二进制代码
二进制数
算法
模式识别(心理学)
数学
算术
基因
统计
生物化学
化学
作者
Qican Zhang,Wenbo Guo,Chao Zuo
摘要
The measuring technique combining phase-shifting algorithm and Gray-code light has been widely used in threedimensional (3D) shape measurement for static scenes owing to its high robustness and anti-noise ability. However, it is challenging for this method to realize a high-speed shape measurement using fewer patterns. Because of the object motion and the defocus of the projector, phase unwrapping errors occur easily on the boundaries of adjacent Gray-code words. In existing methods, median filtering or extra patterns projecting were used to overcome this challenge. In this paper, two robust Gray-code coding strategies have been proposed for the same purpose. By recoding the traditional Gray codes in temporal and spatial domains respectively, cyclic complementary Gray-code (CCGC) patterns and shifting Gray-code (SGC) patterns are designed. Both of these two coding strategies can obtain two sets of decoding words whose boundaries are stagger for one wrapped phase. To avoid using the decoding words on the edge, different decoding codes are used depending on the range of phase value. So the robust and simple phase unwrapping can be achieved without projecting extra patterns. High-quality 3D results of multiple randomly moving objects with sharp edges verified the proposed methods’ feasibility and validity
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