基于光流场理论测量物体变形相位的新方法

基于光流场理论,提出一种由两幅条纹图像解调出 物体变形相位的新方法。首先根据光流场理论,获 得两帧连续图像之间的光流矢量场；然后运用双幅图像中初始图像的条纹频率与矢量场进行 计算,获得 物体的全场变形相位分布。模拟结果和实 验结果表明,本文算法将直观的运动矢量场和变形相位的提取相联系,能够解调出物体变形 相位信息, 不需要相位解包络运算,过程简单方便,并且在条纹越密集处提取的变形相位信息越准确。 本文方法为计算 物体全场变形相位分布和动态测量提供了新的途径。

A new method for phase measurement of a deformation based on optical flow analy sis

A novel algorithm which extracts the d e formation-phase from two continuous fringe patterns is proposed.The velocity fi eld between two consecutive frames is estimated by the basic assumption of optical flow analysis,So the whole- field deformation-phase map is obtained by the estimation of the velocity field and the local frequency of the original image,which is calculated by windowed Fourier transform algorithm.Only two continuous fringe patterns are required in the deformation-phase measurement.Moreover,the new algorithm works perfectly at the areas with dense fringes.In this paper,the proposed algorithm is introduced and applied to simulated and experimental interferograms . The results of simulation and experiment show that the new method can demodulate the deformation-phase from the visible optical flow velocity field without unwrapping process.Further more,dynamic deformation phase extraction wi ll be realized when the time interval of two continuous images is known.This paper provides a new approach for whole-field deformation-phase measurement and dynamic deformation measurement.