Method for controlling video coding bit rate

A bit rate control and video coding technology, applied in image coding, television, code conversion, etc., can solve the problems of accuracy limitation, complexity, difficult coding system, etc., to achieve good weak correlation between sources, accurate coding bit allocation optimization Effect

Inactive Publication Date: 2003-08-06
HUAZHONG UNIV OF SCI & TECH
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Problems solved by technology

For example, in U.S. Patent No.6,366,704, No.6,356,668, No.6,212,302, No.6,037,987, No.6,072,831 and No.6,167,162, when solving the problem of coding bit rate control, the coding bit rate-distortion model based on quantization parameters is adopted , these models are either relatively simple, using second-order polynomials of quantization p

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  • Method for controlling video coding bit rate
  • Method for controlling video coding bit rate

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Embodiment Construction

[0027] The video coding bit rate control method provided by the present invention is mainly applied in solving transformation-based digital video coding systems to realize fast and accurate coding bit rate control. The specific implementation method is completed according to the following steps.

[0028] Step 1: Establish a correspondence table between quantization parameters and transformation ratio parameters.

[0029] The transformation ratio parameter p is: after the original image undergoes discrete cosine transformation, the number N of coefficients (coefficients that are not quantized to zero) that have practical meaning for coding T and the original number of pixels N 0 The ratio of p=N T / N 0 . The correspondence between the quantization parameter and the transformation ratio parameter is through the formula p = 1 - 1 M Σ | x ...

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Abstract

This invention discloses a video code bit rate control method in which quick and accurate predict of the code bit rate can be realized by the good linear relationship between code bit number and transformation ratio parameter, good information source weak correlation between code distortion and the transformation ratio paremter, the target code bit number can be determined, according to the predict and the code buffer, then code quqntification parameter is adjusted according to the relationship between the transformation rate and the quantification parameters to control the code bit rate. Thecode parameter is adjusted according to code macro-block distortion.

Description

technical field [0001] The invention belongs to the field of transmission and processing of video information in the field of digital video communication, and in particular relates to a video encoding bit rate control method. Background technique [0002] In 1948, Shannon proposed the idea of ​​coding associated with a certain fidelity criterion. Later, a related paper was published in 1959, which made a fundamental statement on the source coding problem, and pointed out that the information rate-distortion theory can determine the theoretical limit of data compression, thus further laying the foundation for the information rate-distortion theory. After the development of Jelinek, Gallager, Berger and others, the limited distortion source coding theory was formed. [0003] In the limited-distortion source coding theory, the rate-distortion (R-D) function R(D) is defined as: Under the premise of the given source message probability distribution {P(xi)} and the average distor...

Claims

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Application Information

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IPC IPC(8): G06T9/00
CPCG06T9/004
Inventor 张江山朱光喜
Owner HUAZHONG UNIV OF SCI & TECH
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