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Two-description video coding method based on Wyner-Ziv principle

A video coding and coding technology, applied in the field of video coding, can solve problems such as the inability to meet the video transmission requirements of low-energy devices

Inactive Publication Date: 2010-01-06
BEIJING JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, the use of existing methods to generate multiple description video streams cannot meet the video transmission requirements of low-energy devices

Method used

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  • Two-description video coding method based on Wyner-Ziv principle
  • Two-description video coding method based on Wyner-Ziv principle
  • Two-description video coding method based on Wyner-Ziv principle

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Embodiment Construction

[0063] Such as Figure 4 As shown, the two-description video coding method based on Wyner-Ziv of the present invention includes two parts of low-complexity coding and high-complexity decoding. On the low-complexity encoding side, the video sequence is first divided into two sub-sequences, and each sub-sequence is first coded with zero-motion H.264 (marked as H.264 0-mv in the figure) to form the first part part 1 of the description, and then optimized Wyner-Ziv encoding of the residuals to generate the second part described in part 2.

[0064] 1. Low complexity coding

[0065] (1) Frame separation

[0066] A video sequence is first divided into two sub-sequences. In order to achieve low-complexity coding, the scheme adopts a simple method of separating odd and even frames. Odd frames form description 1, and even frames form description 2.

[0067] (2) H.264 0-mv encoding

[0068] The use of H.264 0-mv encoding is to meet the low-complexity encoding requirements of part 1. ...

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Abstract

The invention relates to a two-description video coding method based on Wyner-Ziv principle. The method comprises the following steps: 1) low-complexity coding, i.e., even and odd frame separation; zero-motion H.264 coding to generate a first part of description; residual SW-SPIHT coding to generate a second part of description; and redundant optimization; 2) high-complexity coding, i.e., decoding by using a central decoder when the two descriptions are received; and performing zero-motion H.264 coding to the first part if only the description 1 is received, and then generating a reference frame Wre2 and side information Y2 by using an interpolation formula as well as a difference value (D1y is equal to Y2-Wre2); and then performing SW-SPIHT decoding to restructure a difference value D'1 to obtain a formula (W''2 is equal to D'1 + Wre2), and finally, merging W'1 and W''2 to obtain a restored complete video sequence V'1. The invention adopts a video coding framework both provided with low coding complexity and good robust performance, and when a description is lost, the method has better compressive performance, also retains the low-complexity coding and also can meet the network video transmission requirement of a device with low energy consumption.

Description

technical field [0001] The invention relates to a video encoding method, in particular to a two-description video encoding method based on Wyner-Ziv theory. Background technique [0002] Multiple Description Video Coding (MVC) is a new coding idea generated in response to the robust transmission of code streams. It divides a video source into multiple code streams (that is, multiple descriptions), and different descriptions are Sending to different channels, when there is a channel loss, the lost description can be estimated by the received description, so as to achieve acceptable recovery quality. When no channel is lost, all received descriptions are used to recover higher quality video. [0003] Two-description coding is the most basic multi-description coding method. It only considers the situation that the information source is divided into two descriptions and sent to two channels. The basic principle is shown in Figure 1(a), 1(b). The decoder 1 and decoder 2 of the ...

Claims

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Application Information

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IPC IPC(8): H04N7/26H04N7/50H04N19/174H04N19/39
Inventor 赵耀王安红
Owner BEIJING JIAOTONG UNIV
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