EFFICIENCY OF BILATERAL FILTER APPLICATION IN PROBLEMS OF OPTICAL FLOW CALCULATION
V. V. Titkov1, S. V. Panin1,2, P. S. Lyubutin1, V. O. Chemezov1
1Institute of Strength Physics and Materials Science, Siberian Branch, Russian Academy of Sciences, 634055, Tomsk, prosp. Akademicheskii, 2/4
2Tomsk Polytechnical University, 634050, Tomsk, prosp. Lenina, 30
Keywords: оптический поток, билатеральный фильтр, трёхмерный рекурсивный поиск, вектор смещения, алгоритм Лукаса - Канаде, мера подобия, optical flow, bilateral filter, three-dimensional recursive search, displacement vector, Lucas -Kanade algorithm, measure of similarity
Abstract
It is proposed to use weight coefficients of the bilateral filter to calculate the measure of similarity of image regions in optical flow calculation algorithms. The efficiency of using this measure is studied by an example of a three-dimensional recursive search algorithm. Weight coefficients are used for calculating the optical flow with subpixel accuracy by the Lucas -Kanade algorithm. A possibility of reducing the optical flow calculation error by means of using the proposed approaches is demonstrated by an example of processing of various types of images. A method of choosing the parameters of the weight functions of the bilateral filter is described and analyzed.
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