A source-channel joint encoding and decoding method for video data stream
A codec method and data flow technology, applied in the direction of digital video signal modification, image communication, electrical components, etc., can solve the problems of high packet loss rate, high data redundancy, and large extra calculation cost at the receiving end, etc., to reduce Scheduling cost, the effect of improving transmission efficiency
Active Publication Date: 2017-09-22
GUANGZHOU HKUST FOK YING TUNG RES INST
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Problems solved by technology
This method is more effective for single-person video upload and download, but when it is applied to upload / download video streams of multiple users in the same local area, the data redundancy is high
Furthermore, scrambling the image frames of the video stream will bring a lot of extra calculation cost to the receiving end (such as: restore the order)
Finally, the data transmission is allocated only according to the subcarrier channel conditions, because the instantaneous channel conditions cannot be obtained, and the packet loss rate will still be relatively high
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[0028] In order to facilitate the understanding of those skilled in the art, the present invention will be further described below in conjunction with the accompanying drawings.
[0029] A source-channel joint encoding and decoding method for video data streams, especially applicable to wireless video transmission of multi-user input and output, as shown in the attached figure 1 As shown, the steps include:
[0030] S101. The transmitter assigns each block of the image frame to a sub-channel for independent encoding and transmission;
[0031] S102. After the transmitting end completes a round of data transmission, the receiving end feeds back a character information to the transmitting end, and the character information reflects the decoding completion status of each sub-channel;
[0032] S103. Use the accumulation of character information obtained in M rounds of transmission as the reliability evaluation value of each sub-channel, where M is an integer greater than or equa...
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A message source channel combined encoding and decoding method for a video data stream comprises the steps that a transmitting terminal appoints each block of an image frame to a sub-channel for independent encoding and transmission, and after a round of data transmission is accomplished by the transmitting terminal, a receiving terminal feeds back a character message to the transmitting terminal to reflect the decoding accomplishing condition of each sub-channel; the accumulation of character messages obtained through M rounds of transmission is taken as the reliability evaluation value of each sub-channel; the product of the error of mean square of each block of the image frame transmitted currently and a DCT coefficient is calculated and serves as the importance evaluation value of the block of the image frame; the sub-channels used for transmission of each block of the image frame are matched based on the reliability evaluation values and the importance evaluation value. According to the method, different kinds of data package transmission scheduling can be conducted by the transmitting terminal on the sub-channels in different conditions, and then transmission efficiency is improved on the premise that video transmission quality is not affected basically; scheduling cost of a wireless router can be reduced when several persons upload / download video streams at the same time.
Description
technical field [0001] The invention relates to the technical field of data transmission, in particular to a source-channel joint codec method for video data streams. Background technique [0002] Currently, mobile video transmission is becoming a major network load for wireless communications. According to the Cisco Video Report, the network traffic load for on-demand video will triple by 2015. However, the quality of mobile video streaming is far from ideal because the wireless channel conditions are extremely unstable. This problem has attracted a lot of research interest with the aim of improving the performance of mobile video transmission. The current state-of-the-art literature proposes several new techniques to improve mobile video delivery. The basic idea of these solutions is to achieve a relatively high-quality video transmission effect by solving high data redundancy. [0003] Today, MU-MIMO (Multi-User Multiple-Input Multiple-Output) systems can support mu...
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IPC IPC(8): H04N19/156H04N19/176H04N19/66H04N19/67H04N19/164
Inventor 王冠华伍楷舜倪明选
Owner GUANGZHOU HKUST FOK YING TUNG RES INST