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H.264 code rate control method based on comprehensive factor

A technology of comprehensive factor and bit rate control, applied in the field of video coding, can solve the problem of not considering the influence of control, and achieve the effect of improving the accuracy of bit rate control, good coding effect and accurate prediction

Inactive Publication Date: 2012-10-24
NANJING UNIV OF INFORMATION SCI & TECH
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Problems solved by technology

However, the above methods do not consider the influence of the position of the reference frame in the image group on the rate control of the current frame.

Method used

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  • H.264 code rate control method based on comprehensive factor
  • H.264 code rate control method based on comprehensive factor
  • H.264 code rate control method based on comprehensive factor

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Embodiment Construction

[0016] The technical scheme of the present invention is described in detail below in conjunction with accompanying drawing:

[0017] H.264 code rate control method of the present invention specifically comprises the following steps:

[0018] A, determine the target number of bits of the current coding frame according to the comprehensive factor; this step includes the following steps:

[0019] A1. Calculate the number of remaining bits of all uncoded frames according to the following formula: the initial parameters have been reflected in the following formula, and j=1 is the expression of the first frame, and the initial parameters have been defined below.

[0020] T r ( n i , j ) = u ( ...

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Abstract

The invention discloses an H.264 code rate control method based on a comprehensive factor and belongs to the technical field of video coding. The H.264 code rate control method gives consideration to influences of a position of a P frame in group of pictures (GOP) on present frame code rate control, defines the comprehensive factor, uses the comprehensive factor to optimize distribution of frame layer target bits, then uses the ratio of actual coding bit quantity of a previous frame and the target bits of a present coding frame to serve as an adjustment factor of a quantization parameter, and dynamically adjusting the quantization parameter and conducting ratio distortion optimization. The comprehensive factor is defined to be average difference value ratio of an image grey level histogram of the present coding frame, mean absolute error ratio of an image brightness component and a weighted sum of the P frame in the GOP position. The method improves accuracy of code rate control and video quality.

Description

Technical field: [0001] The invention relates to the technical field of video coding, in particular to a code rate control method for H.264 video coding based on a synthesis factor. Background technique: [0002] In video communication, the compressed and coded information flow often needs to be transmitted on the network with unbalanced bandwidth. In order to make the coded video stream well adapt to the bandwidth, especially adapt to the low-bandwidth channel or time-varying wireless channel and make full use of the limited network resources, bit rate control has become an essential link in the video communication system. The main task of bit rate control is to collect information such as buffer status and image activity to allocate a certain number of bits to each image, so that the output bit rate can be controlled at a given standard and the image distortion is minimized. [0003] In the rate control method of H.264 / AVC, due to the use of quantization parameters in the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04N7/26H04N7/50
Inventor 陈晓刘海英
Owner NANJING UNIV OF INFORMATION SCI & TECH
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