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Self-adaption H.264 code rate control method

A rate control and self-adaptive technology, applied in the field of video coding, can solve the problems of inability to respond to complexity, large absolute difference of gray value, etc., and achieve good encoder buffer occupancy, good channel bandwidth, and low encoder buffer. The effect of zone occupancy

Inactive Publication Date: 2011-08-17
NANJING UNIV OF INFORMATION SCI & TECH
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Problems solved by technology

A method based on the absolute difference of gray values ​​[W. Fernando, C. Canagarajah, D. Bull. "Fade-in and Fade-out Detection in video sequence using Histograms", ISCAS 2000-IEEE International Symposium on Circuit and Systems, May 28 -31, 2000.] can better reflect the degree of scene change, but once the global motion is involved and the correlation within the image is not strong, the absolute difference of the gray value will be very large, so it cannot reflect the real complexity at this time

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  • Self-adaption H.264 code rate control method
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  • Self-adaption H.264 code rate control method

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Embodiment Construction

[0043] The technical scheme of the present invention is described in detail below in conjunction with accompanying drawing:

[0044] H.264 code rate control method of the present invention specifically comprises the following steps:

[0045] 1) Determine the target number of bits of the current coded frame according to the scene switching factor; this step includes the following steps:

[0046] ① Calculate the remaining bits of the uncoded frame according to the following formula:

[0047] ,

[0048] in, Indicates the first i The first GOP layer is encoded to the first j The total number of bits remaining at frame time, Indicates the available channel bandwidth before encoding the first frame, is the frame rate, Indicates the number of image frames in the GOP layer, which is the size of the buffer, Indicates the first The actual occupancy rate of the buffer after the last frame encoding in a GOP layer, is the first i GOP layer No. j The number of bits ac...

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Abstract

The invention provides a self-adaption H.264 code rate control method and belongs to the technical field of video coding. The method comprises the following steps: firstly defining scene switching factors according to a frame complexity coefficient and then self-adaptively distributing the target bit of frame according to each frame scene switching factor. According to the method, the scene switching factors can efficiently deal with the scene switching which probably occurs in a video sequence, thereby efficiently realizing the code rate control, efficiently improving the influence of scene switching on the video quality, balancing the image quality, the channel bandwidth and the occupied rate of encoder buffer zone after compressing, and keeping lower occupied rate of encoder buffer zone.

Description

technical field [0001] The invention relates to an adaptive H.264 code rate control method based on scene switching, and belongs to the technical field of video coding. Background technique [0002] As a new generation of international video compression standard, H.264 absorbs the advantages of various previous coding schemes, especially MPEG-2 and H.263++, and also integrates some current advanced coding technologies. Since its formal promulgation in 2003, H.264 has attracted extensive attention from industry and academia. [0003] The channel rate and storage space of the actual video system are always certain. In order to match the code rate generated by encoding with channels of different bandwidths, the code rate control has become an important link in the video communication system, which has an important impact on the video quality. [0004] In the rate control method of H.264, due to the use of quantization parameters in the rate control and rate-distortion optimiz...

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Application Information

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IPC IPC(8): H04N7/26H04N19/142H04N19/146
Inventor 陈晓陆飞飞
Owner NANJING UNIV OF INFORMATION SCI & TECH
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