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H.264 code rate control method based on frame complexity

A bit rate control and complexity technology, applied in the field of video coding, can solve problems such as incompleteness, achieve the effect of bit rate control, improve video coding quality, and optimize frame-level target bit allocation

Inactive Publication Date: 2010-11-24
HUAIAN CITY HUAIGONG VEHICLE INSPECTION INST
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Problems solved by technology

Both the average difference and the average absolute error ratio of the gray histogram can measure the complexity of the image from one side, but they are not comprehensive enough.

Method used

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  • H.264 code rate control method based on frame complexity
  • H.264 code rate control method based on frame complexity
  • H.264 code rate control method based on frame complexity

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Embodiment Construction

[0019] The technical scheme of the present invention is described in detail below in conjunction with accompanying drawing:

[0020] Specifically, the H.264 code rate control method based on frame complexity of the present invention comprises the following steps:

[0021] A, determine the target number of bits of the current encoding frame according to the frame complexity; this step includes the following steps:

[0022] A1. Calculate the number of remaining bits of the uncoded frame according to the following formula:

[0023] T r ( n i , j ) = u ( n i , 1 ...

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Abstract

The invention discloses an H.264 code rate control method based on frame complexity, belonging to the technical field of video encoding. The method comprises the following steps of: A. determining the target bit number of a current encoding frame according to the frame complexity; and B. calculating quantitative parameters and carrying out rate-distortion optimization. The H.264 code rate control method is characterized in that the frame complexity is judged through a complexity coefficient, wherein the complexity coefficient is defined as the sum of an average difference value of an image histogram and a weighted average absolute error ratio of an image brightness component, and the traditional target bit formula is amended through an empirical formula on the basis of the complexity coefficient. The invention can not only control the code rate more accurately, but also improve the average peak signal-to-noise ratio of a video output sequence, thereby obtaining the better image quality. The invention simultaneously reduces the quality fluctuation among video image frames and ensures that the video image quality is smoother.

Description

technical field [0001] The invention relates to the technical field of video coding, in particular to an H.264 coding control method based on frame complexity. Background technique [0002] In the past ten years, video communication technology has been developed rapidly and widely used, and a series of video coding standards have been formulated. Existing international video coding standards mainly include MPEG-1, MPEG-2, MPEG-4 (see document: ISO / IEC 13818-2.Information technology-Genericcoding of moving pictures and associated audio Part 2: Video[S].1996; ISO / IEC14496-2.Information technology-Generic coding of audio-visual objects Part2:Visual[S].1998.), and the H .26x series, such as H.261 (see document: ITU-T.Draft ITU-T Recommendation H.261.Video codec for audio visualservices, at px64kbps[S], 1993.), H.263 (see document: ITU- T. Draft ITU-T Recommendation H.263. Video coding for low bit rate communication [S]. 1996.), etc. In 2003, the joint video working group JVT ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04N7/26H04N7/64H04N19/146H04N19/70H04N19/89
Inventor 陈晓陆飞飞
Owner HUAIAN CITY HUAIGONG VEHICLE INSPECTION INST
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