Rajshekhar G, Gorthi Sai Siva, Rastogi Pramod
Applied Computing and Mechanics Laboratory, Ecole Polytechnique Fédérale de Lausanne, 1015 Lausanne, Switzerland.
Appl Opt. 2011 Jan 20;50(3):282-6. doi: 10.1364/AO.50.000282.
This paper presents a pseudo Wigner-Ville-distribution-based method in fringe projection for analyzing temporal behavior of the displacement derivative for a continuously deformed object. In the proposed method, a computer generated fringe pattern is projected on an object undergoing dynamic deformation, and the reflected intensity is recorded in the form of video, i.e., a stack of images are captured sequentially by a CCD camera. Each image represents a recorded fringe pattern at a particular time instant whose phase contains information about the instantaneous out-of-plane displacement or deformation with respect to the undeformed object, and the corresponding spatial phase derivative relates to the displacement derivative. Subsequently, pseudo Wigner-Ville distribution is used for instantaneous phase derivative estimation from the stack of images. Simulation and experimental results are presented to demonstrate the method's potential.
本文提出了一种基于伪维格纳-威利分布的条纹投影方法，用于分析连续变形物体位移导数的时间行为。在所提出的方法中，将计算机生成的条纹图案投影到正在进行动态变形的物体上，并以视频形式记录反射强度，即由电荷耦合器件（CCD）相机顺序捕获一叠图像。每个图像代表在特定时刻记录的条纹图案，其相位包含相对于未变形物体的瞬时面外位移或变形的信息，并且相应的空间相位导数与位移导数相关。随后，使用伪维格纳-威利分布从图像堆栈中估计瞬时相位导数。给出了仿真和实验结果以证明该方法的潜力。
