We present an easy and at the same time effective computational algorithm for tracing the interferograms of phase objects. The approach to preprocessing of interference patterns, which includes image denoising and removal of distortions, is given. We provide a detailed description of the parabola method involved in the algorithm for searching candidates for extreme points and consider the criteria for their selection and drawing lines connecting such points, i.e., the traces of the interference fringes. The advantages and disadvantages of the method, when applied to the study of complex-structured phase objects such as spark channels, which are formed during electrical discharges in ambient air, are discussed.

我们提出了一种简单而有效的计算算法，用于跟踪相位对象的干涉图。给出了干涉图样的预处理方法，其中包括图像去噪和失真消除。我们对抛物线方法进行了详细描述，该算法涉及用于搜索候选点的极端点，并考虑了选择它们的标准以及绘制连接这些点的线，即干涉条纹的痕迹。讨论了该方法的优缺点，当用于研究复杂结构的相对象（例如火花通道）时，该火花对象是在环境空气放电过程中形成的。