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Method and device for rate distortion rate control

A rate control and rate-distortion technology, applied in the field of multimedia data processing, can solve the problem that the code rate and the best picture quality cannot be guaranteed.

Inactive Publication Date: 2009-03-18
湖北鸿云科技股份有限公司
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Problems solved by technology

[0014] In view of this, the present invention provides a method and device for rate-distortion code rate control to solve the problem that the code rate cannot be guaranteed to be satisfied and the image quality is optimal in the above-mentioned code rate control method

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  • Method and device for rate distortion rate control

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Embodiment Construction

[0040] In order to clearly illustrate the solutions in the present invention, preferred embodiments are given below and detailed descriptions are given in conjunction with the accompanying drawings.

[0041] see figure 1 , figure 1 is a flowchart of an embodiment, including:

[0042] Step 11: Obtain the information of the processed macroblock in the current frame;

[0043] The information of the macroblock includes: the pixel variance value σ of the macroblock i i , header information H of macroblock i i (such as coding model, motion vector, etc.), the target bit number R of the whole frame image t , macroblock i represents the macroblock number of the current macroblock layer;

[0044] Step 12: Obtain a code rate function and a distortion function through the obtained macroblock information;

[0045] Among them, the code rate function is: R i - H i ...

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Abstract

The invention discloses a method of controlling rate-distortion code rate, comprising obtaining the information of the macroblock processed in the current frame; the information comprises: pixel variance yields sigmai of the macroblock i; head information Hi of the macroblock i; target bit Ri of the macroblock i; target bit Rt of the whole frame picture; the macroblock i representing the macroblock number of the current macroblock; the zero coefficient ratio and step-size are calculated according to the rate-distortion function, and the bit number of the current macroblock is controlled by the step-size. The invention further provides a device of controlling rate-distortion code rate, comprising an information unit, a calculating unit and a code rate control unit. The method and device of the invention rapidly and accurately control the data bit of each frame; the calculating process is simple, which can obtain the optimized step-size and picture quality.

Description

technical field [0001] The present invention relates to the technical field of multimedia data processing, in particular to a method and device for rate-distortion code rate control. Background technique [0002] Bit rate control is a key technology of real-time video coding, which determines the quality of encoded images; especially in wireless low bit rate real-time video communication, the bit rate control algorithm is very important. The rate-distortion theory is widely used in video coding, and it provides an idea to compress the best image quality under a certain coding bit rate limitation. [0003] First of all, we need to analyze and estimate the relationship between the bit rate and distortion (R-D) of the video encoder. This relationship can often be decomposed into the relationship between bit rate and quantization (R-Q), and the relationship between distortion and quantization (D-Q), that is, R (q), D(q). It can be seen from the rate-distortion theory and video...

Claims

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Application Information

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IPC IPC(8): H04N7/24H04N7/64H04N19/89
Inventor 沈未名黄晓平种衍文万守杰杨黎东方广李伟宋绘宏鲁盛
Owner 湖北鸿云科技股份有限公司
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