Laboratorio de Instrumentación Espacial, Instituto Nacional de Técnica Aeroespacial, Carretera de Ajalvir Km 4, 28850, Torrejón de Ardoz, Madrid, Spain.
Opt Lett. 2010 Nov 1;35(21):3550-2. doi: 10.1364/OL.35.003550.
We demonstrate a method to directly demodulate closed-fringe interferograms using a kind of active contour called a snake. This method can be used to demodulate a single closed-fringe interferogram when its background illumination and/or contrast terms have a spatial frequency similar to the spatial frequency of the equivalent normalized interferogram. Among other cases, this problematic usually appears in interferometry when spurious reflection appears in the interferogram. In these situations, typical Fourier-based methods are of no help. We show a set of simulations and experimental results that prove the effectiveness of the proposed method.
我们展示了一种使用称为蛇的主动轮廓线直接解调闭合条纹干涉图的方法。当背景照明和/或对比度项的空间频率与等效归一化干涉图的空间频率相同时，该方法可用于解调单个闭合条纹干涉图。在其他情况下，当干涉图中出现虚假反射时，这种有问题的情况通常会出现在干涉测量中。在这些情况下，基于傅里叶的典型方法无济于事。我们展示了一组模拟和实验结果，证明了所提出方法的有效性。
