摘要
双频条纹投影法是一种常用的相位展开算法。受随机噪声和相机离焦等因素的影响,双频相位展开算法的条纹级次计算结果易出现错误,导致相位误差。为了解决此问题,提出了一种相位展开校正算法,对高频条纹级次进行校正。首先,根据高频截断相位的取值范围,将整个条纹区域分割成两个掩模;然后,分别对这两个掩模进行连通域标记,统计每个标记区域内出现次数最多的条纹级次,并将出现次数最多的条纹级次值赋值给当前标记区域内的所有像素;最后,使用校正后的条纹级次进行相位展开,获得绝对相位。仿真和实际实验结果均表明,该方法能够有效地消除双频条纹投影法中的相位展开误差。
Dual-frequency fringe projection method is a common phase unwrapping algorithm.Due to the influence of factors such as random noise and camera defocusing,the fringe order calculation results of the dual-frequency phase unwrapping algorithm often have errors,leading to phase errors.In order to solve this problem,this paper proposes a phase unwrapping correction algorithm to correct the high-frequency fringe orders.First,the entire fringe region is divided into two masks according to the value range of high-frequency truncated phase.Then,the connected components of these two masks are marked,respectively.In addition,the fringe orders that appear most frequently in each marked region are counted,whose values are assigned to all pixels in the current marked region.Finally,the absolute phase is obtained by unwrapping the corrected fringe orders.The simulation and actual experimental results show that the proposed method can be used to effectively eliminate the phase unwrapping errors in the dual-frequency fringe projection method.
作者
程磊
潘艳娟
奚冬冬
王玉伟
刘路
Cheng Lei;Pan Yanjuan;Xi Dongdong;Wang Yuwei;Liu Lu(Schoolof Engineering,Anhui Aricultural Ugniversity,Hefei,Anhui 230036,China;Anhui Povince Erngineering Laboratory of Intelligent Aricultural Machinery and Equipment,Hefei,Anhui 230036,China)
出处
《激光与光电子学进展》
CSCD
北大核心
2021年第12期200-206,共7页
Laser & Optoelectronics Progress
基金
安徽省自然科学基金(2008085QF318)
安徽省重点研发与开发计划(202004h07020009)。
关键词
图像处理
结构光
双频条纹
相位展开
连通域标记
image processing
structured light
dual-frequency fringes
phase unwrapping
connected component labeling
