Ratioless encoding and decoding method and device for video stream
A technology of rateless encoding and decoding methods, applied in the field of rateless encoding and decoding methods and devices for video streams, can solve problems such as inapplicability, achieve the effects of reducing scheduling costs and improving transmission efficiency
Active Publication Date: 2014-08-13
GUANGZHOU HKUST FOK YING TUNG RES INST
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However, this method needs to frequently change the wireless frequency band for transmission. This method of frequently switching frequency bands is not applicable in many cases (for example, the surrounding frequency bands are occupied by other devices)
Furthermore, when multiple users upload / download videos at the same time, changing the frequency band will bring a lot of additional control costs (such as the transmitter needs to receive and coordinate other frequency bands that can be used by each receiver, and then perform frequency band analysis to determine The frequency range that needs to be switched in the end)
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[0032] 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.
[0033] A rateless encoding and decoding method for video streams, which can be applied to wireless video transmission of multi-user input and output, as shown in the attached figure 1 As shown, the steps include:
[0034] S101. The transmitting end performs discrete cosine transform on the video stream to be encoded;
[0035] S102. The transmitting end performs quantization and classification on the video stream to be encoded;
[0036] S103. Perform F-spinal rateless encoding, the F-spinal rateless encoding is based on spine codes, and in combination with the frequency diversity feature under OFDM modulation, assigns each block of video frame data to a sub-channel for independent encoding and transmission ;
[0037] S104. After the transmitting end completes a round of data transmission, the recei...
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The invention discloses a ratioless encoding and decoding method and device for a video stream. The method comprises the steps that discrete cosine transformation and quantitative classification are conducted by a transmitting terminal on the video stream to be encoded; F-spinal ratioless encoding is conducted, wherein the F-spinal ratioless encoding is based on spinal codes, and data in each block of a video frame are encoded and transmitted independently in a specified sub-channel according to the frequency diversity features in an OFDM modulating mode; after a round of data transmission is accomplished by the transmitting terminal, a receiving terminal feeds back a character message reflecting the decoding accomplishing condition of each sub-channel to the transmitting terminal; the transmitting terminal conducts data transmission scheduling on the sub-channels with different channel conditions according to the feedback of the receiving terminal. According to the method and device, 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 method and device for rateless encoding and decoding of video 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 c...
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IPC IPC(8): H04W28/02H04W28/16H04L1/00H04L1/18
Inventor 王冠华伍楷舜倪明选
Owner GUANGZHOU HKUST FOK YING TUNG RES INST