Larin V. Methods of improving the quality of video information processing in computer systems and special purpose networks

The development of software and hardware components of video information processing in computer systems and special purpose networks, which are determined by the growth of traffic and society's need for modern services, lead to the need for continuous growth and modernization of computer systems and networks. The existing mechanisms provide an impact on the intensity of the flow of video information due to unforeseen loss of information and significant delays in processing. Therefore, it is necessary to investigate the conditions and causes of increased intensity of the video stream, based on the analysis of which, the development of a method for controlling the intensity of video data in compliance with the requirements for the quality of restored video information on the receiving side. Thus, the topic of the dissertation research on the development of methods for improving the quality of video information processing in computer systems and special purpose networks is relevant. As a result of the dissertation work the following main scientific results were obtained: 1) for the first time a method of video stream processing based on coding of predicted frames in computer systems and special purpose networks is proposed, which allows to reduce the amount of transmitted data by an average of 2-3 times. 2) the method of forming a compact representation of segmented images, which differs from the known process of construction of codograms, taking into account the established limit on the maximum length of the codogram and provides compression in the mode of limited values of the quality loss factor. 3) the method of processing video stream frames based on transformation, which differs from the known compact representation of transformants as a result of recurrent two-level coding, which allows to organize image reconstruction using a number of operations not exceeding the number of operations spent on compression. 4) for the first time the method of video stream compression of dynamic images of a stationary background on the basis of separate processing of stationary and dynamic components is offered that allows to consider structural features of a differential frame, namely various degree of saturation and the big sizes of areas of a stationary background. 5) the method of processing the dynamic component of differentially represented frames is improved, which differs from the known ones by constructing position numbers with adaptive choice of base values and allows to increase the degree of compression of the binary mask of differentially represented frames. 6) improved method of compact representation of service data, which differs in the use of structural similarity of the matrix of pointers and the matrix of the binary mask and allows to take into account the structural similarity of the video stream. 7) a method for presenting service data of a differentially represented frame has been created, which allows to build a system for controlling the bit rate of the video stream in computer systems and networks with low channel bandwidth. The practical significance of the obtained: gain by the degree of intensity reduction at a given parameter PSNR on average from 20% to 36% relative to the MPEG standard; the specified level of intensity in the control process for higher quality indicators, which is determined by the PSNR parameter, at a level of approximately 30 dB. This is on average 16% better than the MPEG standard; reduction of video transmission time from source to receiver on average from 18% to 23% for Wi-Fi technology; reducing the utilization factor of the switching node by an average of 8% at the maximum intensity of video traffic; reduction of video stream processing time by an average of 4% compared to similar mechanisms in the MPEG standard; reducing the probability of packet loss by an average of 4 to 6 times compared to the MPEG standard. The researches carried out in the dissertation work allow to develop and to improve the software and hardware components of video information processing in computer systems and special purpose networks. The validity of the main scientific provisions, conclusions and recommendations obtained in the dissertation is confirmed by the software integration of the developed methods in computer systems and special purpose networks, as well as the absence of contradictions between known and obtained scientific results. In favor of the reliability of the main scientific provisions, conclusions and recommendations, the results of evaluating the effectiveness of the process of managing the intensity of video traffic in computer systems and special purpose networks, as well as testing the results of scientific and technical seminars and conferences.