摘要
精确提取相位信息是结构光三维形貌测量的关键,鉴于现有的光纤干涉条纹图像相位提取方法存在测量精度低,不适用于对动态物体测量的问题,提出了基于希尔伯特变换的相位恢复算法。利用两次希尔伯特变换法从单幅条纹图中获取正弦和余弦分量,由这两个分量构造解析信号,通过解析信号得到复杂图像的包裹相位信息,再通过相位解包裹实现对全场相位分布信息的获取。分别通过计算机仿真和M-Z光纤干涉仪实际投射干涉条纹图像进行实验,结果表明,改进的方法不仅可以精确地恢复相位信息,而且大大提升了计算速度。
Accurate extraction of phase information is the key to the measurement of structured light three - dimensional profilometry. The disadvantages of the existing phase extraction method for fiber - optic interferometric imaging such as low precision are given, which maybe unmatched for dynamic object measurement. Therefore, a phase recovery algorithm based on Hilbert transform is proposed. The analytic signal by component of sine and cosine arise from the Hilbert transform twice to a single carrier frequency fringe pattern is constructed. Then the wrapped information of complex image is obtained by analytic signal immediately. Through the unwrapped method, the whole phase distribution map of the fringe pattern is obtained. The research achievement shows that the improved method can accurately retrieve the original phase and greatly improve the calculation speed.
作者
段晓杰
赵鹤
汪剑鸣
王重祁
DUAN Xiao - jie1,2, ZHAO He1,2, WANG Jian - ming1,2, WANG Chong - qi1,2(1. School of Electronics and Information Engineering, Tianjin Polytechnic University, Tianjin 300387, China; 2. Tianjin Key Laboratory of Optoelectronic Detection Technology and System, Tianjin 300387, China)
出处
《计算机仿真》
北大核心
2018年第10期389-392,共4页
Computer Simulation
基金
国家高技术研究发展计划(863计划)(2013AA102402)
国家自然科学基金项目(61405143
61373104)
天津市应用技术及前沿技术研究计划项目(15JCQNJC01500)
关键词
条纹投影
希尔伯特变换
解析信号
相位提取
Fringe pattern
Hilbert transform
Analytic signal
Phase extraction
