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This article describes the approaches to extract from the video sequence of areas relating to movable objects, which may cause a dangerous situation at a railway crossing. The proposed approach will improve the quality of the mobile object allocation, which will reduce the time image processing to identify moving objects in order to determine the degree of risk. To assess the quality of algorithms was develop a software product and simulated motion capture.

The paper presents a comparative analysis of different methods of quantization of continuous signals, including optimal with the maximum entropy and the entropy – suboptimal, with various parameters of signal distribution.