H.264 code rate control method

A rate control and histogram technology, applied in the field of video coding, can solve the problem of not considering the influence of coded frames, linear MAD prediction model and header information bit quantization parameters cannot generate coded bits, etc., to achieve good image quality and improve smoothness. performance, accurate control of the bit rate

Inactive Publication Date: 2010-11-24
常熟市广播电视总台
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Problems solved by technology

However, this method is only optimized from the perspective of frame-level target bit allocation, and the traditional method in JVT-G012 is still used when calculating the quantization parameters, without considering the influence of the characteristics of the...

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  • H.264 code rate control method
  • H.264 code rate control method
  • H.264 code rate control method

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Embodiment Construction

[0021] The technical scheme of the present invention is described in detail below in conjunction with accompanying drawing:

[0022] H.264 code rate control method of the present invention specifically comprises the following steps:

[0023] A, determine the target number of bits of the current encoding frame according to the frame complexity; this step includes the following steps:

[0024] A1. Calculate the number of remaining bits of the uncoded frame according to the following formula:

[0025] T r ( n i , j ) = u ( n i , 1 ...

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Abstract

The invention discloses an H.264 code rate control method which belongs to the technical field of video coding. The prior method is realized in a way that: the weighted sum of the mean difference of image gray histograms and the mean absolute error rate of image brightness components is used as a frame complexity factor, and the target bit number of the current coded frame is determined according to the complexity factor. On the basis of the prior method, the method of the invention considers the effects of the characteristics of the coded frames on the control on the code rate of the current frame, introduces an adjustment factor, and dynamically adjusts quantization parameters and optimizes the rate distortion by using the adjustment factor. The method can accurately control the code rate and obtain better image quality at the same time. The method also well inhibits the interframe quality fluctuations, thereby enhancing the smoothness of video images and keeping a lower occupancy rate of an encoder buffer area.

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. 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 rate control and rate-distort...

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Application Information

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IPC IPC(8): H04N7/26H04N19/124H04N19/146H04N19/156H04N19/176
Inventor 陈晓陆飞飞
Owner 常熟市广播电视总台
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