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Video-frequency encoding-rate controlling method

A video coding and rate control technology, applied in the field of multimedia communication, can solve the problem that the video coding rate cannot be accurately controlled in the range of the target rate.

Inactive Publication Date: 2009-06-24
SNAPTRACK
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  • Description
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AI Technical Summary

Problems solved by technology

[0030] The purpose of the present invention is to provide a method for video coding rate control to overcome the problem that the video coding rate cannot be accurately controlled in the interval of the target rate in the prior art

Method used

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Embodiment Construction

[0093] The core of the present invention is to establish a secondary rate-distortion model according to the rate-distortion theoretical model of the information source with Laplace distribution statistical characteristics, and perform video coding rate control according to the secondary rate-distortion model.

[0094] The technical solution provided by the present invention will be further described below based on the core idea of ​​the present invention.

[0095]If the source has the statistical characteristics of Laplace distribution, the logarithmic form of the rate-distortion equation can be expanded into a Taylor series to obtain the following expression:

[0096] R ( D ) = ln ( 1 αD ) = ( 1 αD - 1 ) ...

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Abstract

The present invention provides a method for video coding rate control, the core of which is: establish a secondary rate-distortion model according to the rate-distortion theory of a source with Laplace distribution statistical characteristics, and perform video coding according to the secondary rate-distortion model rate control. The secondary rate-distortion model established by the present invention is more in line with the rate-distortion characteristics of the real video source, and the present invention can make the encoding output rate of the video sequence closer to the given channel bandwidth, and has good rate-distortion performance, which can Widely used in network real-time multimedia communication, network streaming media and other applications; thereby achieving the purpose of improving the accuracy of video encoding rate control and improving video encoding quality.

Description

technical field [0001] The invention relates to the field of multimedia communication, in particular to a method for video coding rate control. Background technique [0002] Video coding rate control is a research hotspot in video coding. Whether it is in the early H.261, MPEG-1, or in the current mainstream H.263 / H.263+ / H.263++, MPEG-2 / MPEG-4, or in the latest video coding rate control In H.264, all are very important. Only by solving the problem of video coding rate control well, can the video media stream be transmitted most effectively on the channel with a given rate. [0003] By optimizing a series of encoding parameters, video encoding rate control can enable the video encoder to obtain the best encoding quality under a given rate limit, and at the same time control the encoding bit rate more accurately near the target rate to meet the channel bandwidth and decoding requirements. End buffer size limit. [0004] QP (Quantization Parameter) and rate-distortion model ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04N7/24
Inventor 罗忠王静万帅常义林杨付正
Owner SNAPTRACK
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