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Bit rate control method for video compression

A bit rate control and video compression technology, applied in digital video signal modification, television, electrical components, etc., can solve the problems of low bit rate control accuracy and large image quality fluctuations, so as to improve bit rate control accuracy and accuracy Good, the effect of improving image quality

Inactive Publication Date: 2011-01-05
SHENZHEN TEMOBI SCI &TECH
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Problems solved by technology

The purpose of the present invention is to provide a video compression code rate control algorithm, aiming to solve the problems of low code rate control accuracy and large fluctuations in image quality in the video compression process of the prior art

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  • Bit rate control method for video compression
  • Bit rate control method for video compression
  • Bit rate control method for video compression

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Abstract

The invention relates to the field of video image processing and provides a bit rate control method for video compression. The method comprises the following steps: A. image features are analyzed, andimage feature complexity factors are calculated; B. the number of target bits which are needed to be distributed to an image is calculated; and C. quantization parameters of codes are obtained by a rate distortion model and combining the number of target bits needed to be distributed to the image. In the invention, the bit rate distribution and the image feature complexity are closely combined, and the quantization parameters Q p of codes are obtained by a secondary non-linear rate distortion model, thereby increasing the bit rate control accuracy and improving the image quality.

Description

A kind of video compression code rate control method technical field The invention relates to the field of video image processing, and more specifically, relates to a video compression code rate control method. Background technique During the video compression process, the amount of data of the compressed frame will change, so the amount of data per unit time (bit rate) will fluctuate. In practical applications, especially in video streaming, a constant bit rate is required. The principle of code rate control is to use a mathematical model to recalculate the quantization factor of the next frame through the currently known user-specified code rate and the number of compressed bits, thereby changing the number of encoded bits to achieve the purpose of controlling the code rate . The traditional code rate control algorithm (such as CBR algorithm) comprises the following steps: (1) according to the target bit rate, distribute the target number of bits almost evenly to ever...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04N7/26
CPCH04N7/26175H04N7/26154H04N7/26079H04N19/124H04N19/147H04N19/149
Inventor 徐苏珊
Owner SHENZHEN TEMOBI SCI &TECH
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