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Low-complexity HEVC code rate adaptive transform coding method based on image correlation model

An image correlation and conversion coding technology, which is applied in image communication, digital video signal modification, electrical components, etc., can solve the problem of high coding complexity

Active Publication Date: 2017-08-18
NANJING UNIV OF POSTS & TELECOMM
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Problems solved by technology

The advantage of this type of transform coding technology is that it has less impact on video coding quality, but its coding complexity is high

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  • Low-complexity HEVC code rate adaptive transform coding method based on image correlation model
  • Low-complexity HEVC code rate adaptive transform coding method based on image correlation model
  • Low-complexity HEVC code rate adaptive transform coding method based on image correlation model

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Embodiment Construction

[0044] Below in conjunction with accompanying drawing, technical scheme of the present invention is described in further detail:

[0045] Video transcoding is an important research content in video coding and multimedia communication. With the application of the new HEVC coding technology and the complexity of the network structure, how to adjust the bit rate of the video stream to make it suitable for the specific network environment is still a very challenging problem.

[0046] Aiming at the research status of HEVC ultra-high-definition video conversion coding, the present invention proposes a low-complexity code rate adaptive conversion coding method, and uses the coding information of the input video to propose an adaptive initial quantization parameter selection method for code rate adaptation; based on Image correlation model, establishment of transcoding rate-distortion optimization strategy, and construction of bottom-up low-complexity transcoding framework. Compared ...

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Abstract

The invention discloses a low-complexity HEVC code rate adaptive transform coding method based on an image correlation model. The method comprises the steps of 1, estimating a code rate-quantization parameter model according to a principle that maximum quantization is equal to zero; 2, selecting an initial quantization parameter according to the estimated code rate-quantization parameter model and a target code rate; 3, generating an initial coding tree according to a code rate distortion estimation model; 4, getting an image correlation coefficient and an image energy item based on the image correlation mode; 5, computing a displacement item of a motion vector; 6, estimating a correlation coefficient item via a residual coefficient of each sub-coding unit; and 7, solving a distortion cost, and rapidly selecting a coding mode for transform coding based on a bottom-up coding framework. The method provided by the invention focuses on reducing coding complexity of video transform by combining with the image correlation mode and coding information of an input video, and has a great significance of improving transform coding efficiency.

Description

technical field [0001] The present invention relates to a new technology of fast transform coding aiming at the problem of code rate adaptation in a heterogeneous network environment, in particular to a low-complexity HEVC code rate adaptive transform coding method based on an image correlation model. Background technique [0002] With the rapid development of multimedia technology and network communication technology, video applications, as the most common multimedia technology application, have covered all aspects of human life. These video applications include video on demand, video conferencing, high-definition television, and video telephony. According to the 2015 China Network Audio-Visual Development Research Report, the number of online video users reached 461 million in 2015, and the utilization rate of online video users was 69.1%. The report also shows that video terminal devices are diverse, including personal computers, mobile phones , TV and tablet PC, etc., a...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04N19/147H04N19/96H04N19/124
CPCH04N19/124H04N19/147H04N19/96
Inventor 熊健桂冠杨洁华文韬解晓波朱颖
Owner NANJING UNIV OF POSTS & TELECOMM
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