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Method of controlling rate of video compression code based on query table in low memory consumption

A bit rate control and video compression technology, applied in the multimedia field, can solve problems such as increased computational complexity, deviation of the model's estimation of the number of bits, and reduced video quality

Inactive Publication Date: 2008-10-08
ZHEJIANG UNIV
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Problems solved by technology

However, in standards such as H.263 and MPEG-4, the difference between the QP values ​​​​of adjacent blocks will be limited to [-2, 2] to prevent large quality fluctuations between adjacent blocks. Such restrictions Weaken the advantages brought by the optimization method, so the model's estimation of the number of bits will introduce bias, and the video quality will also decrease
[0007] 4) The rate-distortion model introduces a large number of complex floating-point operations, and the computational complexity rises sharply, which also increases the cost of hardware implementation

Method used

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  • Method of controlling rate of video compression code based on query table in low memory consumption
  • Method of controlling rate of video compression code based on query table in low memory consumption
  • Method of controlling rate of video compression code based on query table in low memory consumption

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Embodiment Construction

[0075] The video compression code rate control method based on the low-memory consumption look-up table proposed by the invention is an improvement to the traditional rate-distortion model-based method. Mainly proceed as follows:

[0076] 1. Preprocessing process of rate control:

[0077] Build a low memory consumption lookup table.

[0078] 2. The actual execution process of bit rate control:

[0079] For each P frame:

[0080] 1) Carry out frame skipping control with reference to the frame skipping control method adopted by H.263 reference model TMN8 or MPEG-4 reference model VM7, if the current frame is not skipped, then enter step 2; otherwise enter the next frame encoding ;

[0081] 2) Perform motion estimation and motion compensation for all macroblocks in the current P frame. Record the motion vector information and SAD value of each macroblock, and divide the macroblock into non-zero macroblocks and all-zero macroblocks, and the non-zero macroblocks are further di...

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Abstract

The method comprises: in the first, executing a pre-process for the coding rate control; then, allocating bit number for each P frame; allocating bit number for each macro block in P frame, and wherein, a low memory consumption polling list is used; after completing macro coding, recording the renewed value. The method can be used in video data coded with H.263, MPEG-4 and H.264 video compression formats and can applied in the occasions requiring high image quality such as: video session, video phone, network TV and video monitoring.

Description

technical field [0001] The invention relates to the field of multimedia technologies related to video transmission control, in particular to a video compression code rate control method based on a low memory consumption lookup table. Background technique [0002] In real-time video communication, the compressed video code stream needs to be transmitted on a complex network with different bandwidth requirements. In order to make the most efficient use of network resources at any time and ensure relatively high video image quality, it is necessary to control the bit rate of the video stream. If the code rate of the code stream generated after video encoding is too high, it will increase the transmission pressure of the network and cause network congestion; on the other hand, if the code rate decreases during the generation of the code stream, the quality of the video image will be reduced. And result in insufficient utilization of network bandwidth. Therefore, it is necessar...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04N7/32H04N19/146H04N19/147H04N19/51
Inventor 陈纯卜佳俊莫林剑杨智赵梦
Owner ZHEJIANG UNIV
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