PI control-based multi-viewpoint video self-adaptive transmission control algorithm

Abstract

The invention relates to a PI control-based MPEG-DASH multi-viewpoint video self-adaptive transmission control algorithm which comprises the following steps: entering an initial cache stage; setting a PI controller; calculating estimated throughput capacity; calculating cache; calculating cache offset; inputting system control variable; according to the output control variable of the PI controller and the evaluated throughput capacity calculated in the step 6, outputting an ith bit stream video slice selection standard by controlling a calculating unit; selecting bit stream, selecting an objective index value from the selected video slices and transmitting the multi-viewpoint bit stream video slice with a bigger SSIM value. By the PI control-based MPEG-DASH multi-viewpoint video self-adaptive transmission control algorithm, the problem of video play stagnation or low bandwidth utilization ratio caused by cache overflow can be avoided.

Description

technical field [0001] The invention belongs to the field of self-adaptive transmission of multi-viewpoint video on a network, and more specifically relates to a control algorithm for self-adaptive transmission of multi-viewpoint video based on PI control, which is applied in a 3D environment. Background technique [0002] With the rapid development of the Internet and various intelligent terminals, people's demand for multimedia information such as video and audio is increasing. In order to solve the problems of compatibility and adaptability among various intelligent The Generation Partnership Project (3GPP) jointly proposed the HTTP-based Dynamic Adaptive Streaming Transport (MPEG-DASH) protocol in 2011, which specifies the format of a Media Description File (MPD) and a media file. [0003] The streaming media transmission mechanism based on the HTTP Dynamic Adaptive (DASH) transmission protocol is driven by the client. Before the video transmission, the server will divid...

AI Technical Summary

Problems solved by technology

[0006] The technical problem solved by the present invention is: in the wireless network environment, provide a kind of MPEG-DASH multi-viewpoint video self-adaptive algorithm based on PI control driven by the client, to meet: in the existing wireless network environment, guarantee The applied video quality closely follows the change of network bandwidth to prevent problems such as video playback stagnation or low bandwidth utilization caused by buffer overflow; in a limited network bandwidth environment, maximize the video quality applied by users to maximize user experience quality ; When the network bandwidth fluctuates, keep the selected video quality stable as far as possible, and avoid causing frequent switching of video quality to bring a sense of fatigue to the user; the technical solution of the present invention is as follows:

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