Method and device of multiple description video coding based on relevance optimization rule

A video coding and correlation technology, applied in the field of video coding, can solve problems such as increasing computational complexity, difficulties, and affecting practicability

Inactive Publication Date: 2010-01-13
BEIJING JIAOTONG UNIV
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  • Summary
  • Abstract
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  • Claims
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Problems solved by technology

Here, if you directly solve this Lagrangian optimization problem, you will face great difficulties. This is because, first of all, it is a very difficult problem to determine two Lagrange multiplication factors; secondly, for each set of determined multiplication factors , corresponding to D S , R and D 0 Both need to be obtained through a complete multi-description encoding and decoding process, which greatly increases the computational complexity
It can be seen that because multi-description coding needs to consider the code rate and distortion of each description, the traditional optimization method often brings high computational complexity, which seriously affects the practicability

Method used

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  • Method and device of multiple description video coding based on relevance optimization rule
  • Method and device of multiple description video coding based on relevance optimization rule
  • Method and device of multiple description video coding based on relevance optimization rule

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Embodiment 1

[0048] Example 1 figure 1 It is a system block diagram of the multi-description video coding method based on the correlation optimization criterion designed according to the present invention. Using a preprocessing procedure to prevent severe motion can lead to severe degradation of the quality of single-channel reconstructions. figure 2 The impact of preprocessing on the quality of single-channel reconstruction is shown. For 3 consecutive frames, k-1, k and k+1, the black circle represents a moving object, and the motion of the object can be seen in the above 3 frames The phenomenon of inhomogeneity occurs, so when we decode in a single pass, if k-1 and k+1 frames are used to reconstruct frame k, there will be obvious distortion. At this time, if the preprocessing method is used to interpolate one frame between frames k and k+1, and reconstruct frame k with k-1 and the interpolated frame during single-channel decoding, a higher quality reconstruction can be obtained image....

Embodiment 2

[0067] Example 2: Figure 7 Shown is a flowchart of the preprocessing process. What needs to be noted here is that we only have the difference between ‖MV‖ not less than the threshold T, that is, |‖MV‖ (k-1，k) -‖MV‖ (k，k+1) In the case of |≥T, the optimal selection of the mode is carried out. And mode 0 also needs to be considered in the selection process, that is, the situation of not adding redundant frames. The reason is that in mode 0, although the temporal correlation of the video subsequence may be reduced, it may have better compression performance because no redundant information is added.

[0068] When making mode selection, we will first base on Figure 8 Perform single-path reconstruction, and then calculate the values ​​of formula (1) in the eight modes according to the calculation method in Table 1, so that the optimal mode of formula (1) is the optimization mode we choose.

[0069] Table 1 Mode Selection ρ intra and ρ inter calculation

[0070]

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Abstract

The invention provides a method and a device of multiple description video coding based on a relevance optimization rule, belonging to the field of video coding. The device comprises a coder, a decoder, a channel 1 and a channel 2, wherein the coder comprises a similarity optimization rule module, a preprocessor, an odd and even frame separator, a standard coder 1 and a standard coder 2; and the decoder comprises a standard decoder 1, a standard decoder 2, an odd and even frame interleaver and a postprocessor. The video coding method better keeps time domain relevance in a video subsequence by using the relevance optimization rule aiming at different motion information on the premise of guaranteeing the compression performance of each video sequence, thereby ensuring that a one-way decoder can more effectively restore lost information so as to improve the reconstruction quality of the one-way decoder.

Description

technical field [0001] The invention relates to a multi-description video coding method and device based on a correlation optimization criterion, and belongs to the technical field of video coding. Background technique [0002] In recent years, with the popularization and promotion of Internet and personal wireless communication equipment, real-time and reliable video transmission in packet switching network and narrowband network has become an inevitable demand, and video data transmission has also been widely used in video telephony, teleconferencing, distance teaching , telemedicine, advertising, entertainment, data retrieval and other fields. However, network channels such as the Internet and wireless communication networks are not very reliable. Specifically, problems such as channel interference, network congestion and routing delay in the Internet will lead to data errors and packet loss; while problems such as random bit errors and continuous burst errors in wireles...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04N7/66H04N19/39H04N19/89
Inventor 白慧慧赵耀刘美琴
Owner BEIJING JIAOTONG UNIV
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