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Bit rate control method for video compression

A bit rate control and video compression technology, which is applied in digital video signal modification, TV, electrical components, etc., can solve the problems of large fluctuations in image quality and low accuracy of bit rate control

Inactive Publication Date: 2009-10-07
SHENZHEN TEMOBI SCI &TECH
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Problems solved by technology

[0005] 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
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Embodiment Construction

[0039] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.

[0040] The present invention distributes the code rate by combining the code rate distribution with the characteristic complexity of the image, and then obtains the quantization parameter of the code through the quadratic nonlinear rate-distortion model, thus improving the code rate control precision and improving the image quality. quality.

[0041] figure 1 Show the flow chart of video compression code rate control method of the present invention, process is as follows:

[0042] In step S101, image features are analyzed, and image feature complexity factors are calculated.

[0043] In step S10...

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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, and image 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

technical field [0001] The invention relates to the field of video image processing, and more specifically, relates to a video compression code rate control method. Background technique [0002] 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 . [0003] 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 every frame image; (2) according to...

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Application Information

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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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