光学与光电技术, 2018, 16 (4): 19, 网络出版: 2018-08-30
面结构光测量系统中基于π/3相移的噪声补偿算法
Noise Compensation Algorithm Basd on π/3 Phase Shift in Structure Light Measurement System
结构光测量 噪声补偿算法 乘性噪声 相移 三维测量 structure light measurement noise compensation method multiplicative noise phase shift 3D measurement
摘要
噪声处理技术是结构光测量中的一个很重要的技术。投影光强在低环境光照强度下呈现指数传播特性,存在严重的噪声,降低了结构光测量的精度。为了解决此问题,提出了一种基于π/3相移的噪声补偿算法。经过相移,信号的强度反转,噪声强度相应反转,相移前和相移后的噪声叠加取平均,就可以达到噪声补偿的效果。实验表明,该算法简单易用,可以大大消除乘性噪声,提高测量的精度。
Abstract
The noise filter algorithm is an important technique in the structure light measuring system. The projected light intensity of the digital projector exhibits an exponential translation characteristic in the low level illumination environment, and lager multiplicative noises are also found, so the measuring accuracy degrades. To solve this problem, a noise compensation algorithm based on the π/3 phase shift is proposed. After π/3 phase shift, the amplitude of signal alternates, so the noise level will alternate too, which are averaged to compensate the noises. The algorithm is simple and feasible. Experimental results show that the multiplicative noises can be compensated and the accuracy is highly improved.
崔索超, 孙峰. 面结构光测量系统中基于π/3相移的噪声补偿算法[J]. 光学与光电技术, 2018, 16(4): 19. CUI Suo-chao, SUN Feng. Noise Compensation Algorithm Basd on π/3 Phase Shift in Structure Light Measurement System[J]. OPTICS & OPTOELECTRONIC TECHNOLOGY, 2018, 16(4): 19.