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Bit rate control method

A technology for rate control and encoding macroblocks, which is applied in the fields of digital video signal modification, electrical components, image communication, etc. It can solve the problem that the rate control algorithm cannot meet the practical application, and achieve good subjective image quality and low computational complexity. , the effect of high control precision

Active Publication Date: 2006-05-03
INESA ELECTRON
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Problems solved by technology

In order to make different standards apply to different code rate ranges, we must formulate different code rate control algorithms for various standards, such as in MPEG-1, H.263, MPEG-2, MPEG-4 standards, there are Many rate control algorithms have been applied in practice. However, in the latest video standards, such as H.264 / MPEG-4AVC and AVS standards, many of the previous rate control algorithms cannot meet the actual requirements due to the adoption of many new encoding technologies. applications, so we need a rate control algorithm designed for these latest standards

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Embodiment approach

[0066] The present invention provides a code rate control method, which comprises the following steps:

[0067] Step 1.1, according to the channel target code rate R and frame rate F, calculate the bit B of each image group gop :

[0068] B gop = B ful ln ess + S gop ( R F ) - - - ( 1 )

[0069] In the above formula B fullness is the number of bits remaining in the cache, S gop Be the number of image frames in each image group GOP;

[0070] Step 1.2, the number of bits B remaining in the cache fullness Initialized to 0.

[0071] Step 2. According to the image type of the current frame, it can be an I image (intra-frame image),...

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Abstract

This invention provides a code rate control method, which applies code rate controls of a frame level and a macroblock level to encode images according to the image kind of the current frame.

Description

technical field [0001] The invention relates to a code rate control method. Background technique [0002] A number of digital audio and video codec standards that have emerged in recent years are representative of the international standards MPEG-1, H.263, MPEG-2, MPEG-4, H.264 / MPEG-4 AVC, and the standard AVS independently developed by my country. , WM9 launched by Microsoft, etc., these standards involve different video bit rate application ranges in practical applications. In order to make different standards apply to different code rate ranges, we must formulate different code rate control algorithms for various standards, such as in MPEG-1, H.263, MPEG-2, MPEG-4 standards, there are Many rate control algorithms have been applied in practice. However, in the latest video standards, such as H.264 / MPEG-4AVC and AVS standards, many of the previous rate control algorithms cannot meet the actual requirements due to the adoption of many new encoding technologies. applications...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04N19/146H04N19/503
Inventor 李国平赵海武陈勇李萍侯钢王国中
Owner INESA ELECTRON
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