HEVC code rate control method based on human vision region importance analysis

A technology of human vision and bit rate control, applied in the field of image communication, can solve the problems of video viewers’ poor viewing experience and video quality that needs to be improved, and achieve the effects of improving subjective and objective quality, improving visual quality, and accurate bit rate

Active Publication Date: 2020-07-24
NORTHWEST UNIVERSITY FOR NATIONALITIES
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Problems solved by technology

[0004] The R-λ rate control model still has deficiencies. Although HEVC rate control is effective and can adapt to the bandwidth rate, it has the problem of poor viewing experience for video viewers. Therefore, the video quality perceived by human eyes still needs to be improved

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  • HEVC code rate control method based on human vision region importance analysis
  • HEVC code rate control method based on human vision region importance analysis
  • HEVC code rate control method based on human vision region importance analysis

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Embodiment Construction

[0025] The present invention will be further described in detail below in conjunction with the examples. It must be pointed out that the following examples are only used to further illustrate the present invention and cannot be interpreted as limiting the protection scope of the present invention. Content, making some non-essential improvements and adjustments to the present invention for specific implementation shall still belong to the protection scope of the present invention.

[0026] The basic idea of ​​the present invention is to use the luminance difference between video frames as the measure of the temporal importance of human vision in each frame, and then use the mean square gradient consistency calculation to measure the spatial importance of the human vision of the current frame, Then, using the proposed perceptual importance model, a new region-level bit allocation method is proposed to keep the balance of video quality. Then an LCU-level bit allocation scheme is ...

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Abstract

The invention provides an HEVC code rate control method based on human vision region importance analysis. A video inter-frame brightness difference value is used as a measurement mode of human eye vision time domain importance of each frame; according to the method, the spatial domain importance degree of the human vision of the current frame is measured by utilizing mean square gradient consistency calculation, and then a new regional level bit allocation method is provided by utilizing the proposed perception importance degree model so as to keep the balance of video quality. An LCU-level bit allocation scheme is then designed to obtain a target bit for each LCU. In order to obtain a more accurate bit rate, an improved R-lambda parameter updating model is used. According to the method, the final coding actual code rate can better meet the given target code rate. Meanwhile, the actual bit tends to be stable, and the human eye perception quality of the coded video is obviously improved.

Description

technical field [0001] The present invention relates to video coding technical issues in the field of image communication, in particular to an HEVC code rate control method based on analysis of the importance of human visual areas. Background technique [0002] In an actual video coding transmission system, video transmission is limited not only by the amount of coded data, but also by the bandwidth of video transmission. Since the complexity of each frame of the video sequence is different, the amount of data generated by each frame after HEVC encoding is also different, which makes the encoding bit rate of each frame fluctuate during the actual encoding of the video. When the encoding of a certain video frame When the bit rate exceeds the bandwidth, video freezes will occur. If the encoding bit rate is too small, bandwidth will be wasted. In order to better adapt the video encoding bit rate to the transmission capacity of the transmission channel, so as to make full use o...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04N19/146H04N19/184H04N19/124H04N19/154
CPCH04N19/146H04N19/184H04N19/124H04N19/154
Inventor 林宏伟李向群高明亮邓克岩王建华吴韬
Owner NORTHWEST UNIVERSITY FOR NATIONALITIES
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