Unlock instant, AI-driven research and patent intelligence for your innovation.

H.264 rate control method suitable for real-time application

A code rate control and real-time application technology, applied in the field of H.264 code rate control, can solve problems such as difficult practical application and high complexity

Active Publication Date: 2013-04-03
SHANGHAI AVCON INFORMATION TECH
View PDF0 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, because it is based on RDO rate-distortion technology and requires multi-layer joint rate control, there is a problem of high complexity. In some real-time communication applications, such as video conferencing systems, it is difficult to be practically applied.

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • H.264 rate control method suitable for real-time application
  • H.264 rate control method suitable for real-time application
  • H.264 rate control method suitable for real-time application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0043] In order to make the technical means, creative features, goals and effects achieved by the present invention easy to understand, the present invention will be further described below in conjunction with specific illustrations.

[0044] The H.264 rate control method applicable to real-time applications of the present invention includes the following steps:

[0045] 1) Calculate the initial quantization parameter according to the target code rate;

[0046] 2) Set the bit stream output buffer occupancy rate;

[0047] 3) Calculate the current frame coding target bit number;

[0048] 4) Calculate the encoding quantization parameter of the current frame;

[0049] 5) Frame skip control;

[0050] 6) Encode the current frame;

[0051] 7) Update the output buffer occupancy rate according to the size of the current frame code stream.

[0052] In this example, the total number of pixels of the image is set to N pixel =width*height, the video frame rate is f=frame_rate, and th...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

The invention discloses an H.264 rate control method suitable for real-time application. The method has the characteristics of low computation complexity and high rate control accuracy, and is very suitable for real-time network video communication application. The method comprises the following steps of: 1) calculating an initial quantization parameter according to a target rate; 2) setting a code stream output buffer area occupancy rate; 3) calculating a current frame coding target bit number; 4) calculating a current frame coding quantization parameter; 5) performing frame skipping control; 6) coding a current frame; and 7) updating the output buffer area occupancy rate according to the code stream of the current frame. The H.264 rate control method suitable for real-time application, based on the frame-level rate control, adopts the buffer area occupancy rate and coded image quality-based frame skipping control method and the frame coding quantization parameter calculation method,has the characteristics of low computation complexity and high rate control accuracy, is concise and practical, and is very suitable for real-time network video communication application such as video conferences and videophones with high requirement on delay.

Description

Technical field: [0001] The invention relates to the technical field of digital video encoding and decoding, in particular to an H.264 code rate control method suitable for real-time applications. Background technique: [0002] Bit rate control plays an important role in fixed bit stream coding, without bit rate control any video coding is difficult to be applied in practice. Some international video compression standards have their specific rate control technology, such as TM5 (Test Model 5) of MPEG-2 video compression standard, TMN8 (Test Model Near 8) of H.263 video compression standard, MPEG-4 video compression standard Standard VM8 (VerificationModel Version 8), etc. The new generation of video compression standard H.264 introduces RDO (Rate-Distortion Optimization) rate-distortion optimization coding technology, which was not in the previous standard, into the coding algorithm, and its bit rate control technology becomes more complicated. The JVT (Joint Video Team) j...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Patents(China)
IPC IPC(8): H04N7/26H04N7/14H04N7/15
Inventor 郭春辉熊模昌
Owner SHANGHAI AVCON INFORMATION TECH