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A Bit Rate Control Method in Distributed Video Coding

A technology of distributed video and control method, applied in the field of video compression, can solve the problem of low computational complexity at the encoding end, achieve the effect of accurate bit rate, improve efficiency, and avoid feedback channels

Active Publication Date: 2017-07-07
NANJING UNIV OF POSTS & TELECOMM
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Problems solved by technology

[0005] Technical problem: Aiming at the problems caused by the feedback channel, combined with the video motion characteristics in the actual scene, a non-feedback bit rate control method with low computational complexity at the encoding end is proposed

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  • A Bit Rate Control Method in Distributed Video Coding
  • A Bit Rate Control Method in Distributed Video Coding
  • A Bit Rate Control Method in Distributed Video Coding

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specific Embodiment

[0044] 1) At the encoding end, by using the absolute error sum criterion, the discrete cosine coefficient difference SAD of the same position block between the original frame and the adjacent key frames is calculated respectively;

[0045] 2) The two discrete cosine coefficient difference SAD calculated in the step 1) and the predetermined threshold T 0 In comparison, if they are all smaller than the threshold, the classification information value of the position block is 0, and it is determined that the position block moves slowly, and the coefficient band of the position block is not encoded at the encoding end; otherwise, the classification information value is 1, and it is determined that the position block is moving slowly. The position block moves violently, go to step 3);

[0046] 3) The error between the original W frame and the side information is defined as correlation noise, which satisfies the Laplace distribution, and its characteristic parameters can be calculated ...

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Abstract

The invention discloses a method for controlling the code rate in distributed video coding. The discrete cosine coefficient difference values between an original frame and the same position blocks between the adjacent key frame in front of the original frame and the adjacent key frame behind the original frame are respectively calculated at the coding end, the discrete cosine coefficient difference values are compared with a preset threshold value to obtain the classification information values, and then the position blocks are judged to be in the slow movement mode or the strenuous movement mode. The code rate which needs to be transmitted by the coding end is estimated according to the different movement modes of the macro blocks, and the efficiency of distributed video coding is improved. The code rate is adjusted in real time in a correlation noise modeling (CNM) through Laplace parameters with the block level and the frame level switched with each other, and under the condition that the transmission of the small code rate is ensured, decoding complexity can be lowered to the maximum extent, and a decoder can conduct decoding correctly.

Description

technical field [0001] The invention relates to a code rate control method in distributed video coding, which belongs to the field of video compression. Background technique [0002] Distributed Video Coding (DVC) is based on the information theory proposed by Slepian.Wolf and Wyner.Ziv in the 1970s, which transfers the computational complexity of the encoder to the decoder. It is characterized by simple encoding, complex decoding, compression performance close to traditional encoding methods, strong anti-error capability, and is suitable for video encoding equipment with limited resources in wireless networks. [0003] Distributed video coding can also effectively compress the code by utilizing the statistical characteristics of the signal only at the decoder. In a distributed video coding system, the total transmission code rate of the system consists of two parts: the code rate of K frames and the code rate of W frames. Among them, the code rate control of K frame can b...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04N19/61H04N19/625H04N19/13H04N19/176
Inventor 吴媛媛蔡睿张登银
Owner NANJING UNIV OF POSTS & TELECOMM
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