Frame-level quantization parameter calculation method suitable for HEVC video coding

A technology that quantifies parameters and calculation methods, and is applied in the fields of digital video signal modification, electrical components, and image communication. performance and accuracy, low implementation complexity

Active Publication Date: 2019-01-01
HANGZHOU DIANZI UNIV
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Problems solved by technology

[0029] This technology uses a fixed parameter δ for all test sequences to reflect the inter-frame dependence, so that the algorithm cannot be adaptively adjusted according to the video content, and it is lacking in universality.
Also, this algorithm is a quantization parameter selection algorithm at the coding level, so this algorithm also has the defects of excessive granularity and incomplete inter-frame reference chains.

Method used

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  • Frame-level quantization parameter calculation method suitable for HEVC video coding
  • Frame-level quantization parameter calculation method suitable for HEVC video coding
  • Frame-level quantization parameter calculation method suitable for HEVC video coding

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Embodiment Construction

[0042] The present invention will be further described below in conjunction with accompanying drawing.

[0043] The present invention first adopts offline heuristic modeling to establish K and Qps , ε, and then apply the established model to the ΔD-ΔQp relationship to establish the ΔD-ΔQp model, and finally integrate ΔD and ΔR into the λ-Qp relationship to obtain frame-level quantization parameters.

[0044] Through offline data statistical analysis, it is found that the frame-level quantization parameter Qp of the current frame s There is a linear relationship between the change amount ΔQp of all frames in the GOP and the average distortion ΔD of all frames in the GOP,

[0045] ΔD=K·ΔQp (7)

[0046] Among them, K is the slope, ΔD=avg(MSE), and MSE is the coding distortion of each frame. Since avg(MSE) is the average distortion of all Qp change-affected frames within the whole GOP, inter-frame dependencies are fully considered in ΔD. After analysis, it is found that the slo...

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Abstract

The invention discloses a frame-level quantization parameter calculation method suitable for HEVC video coding. According to the method, an inter-frame dependence-based distortion prediction model (deltaD-deltaQp model) is established; the model is applied to rate distortion optimization, so that a Lagrange multiplier lambda which appears when rate distortion cost is the smallest is solved; and anoptimal frame-level quantization parameter is solved according to a lambda-Qp relationship; and the deltaD-deltaQp model not only reflects inter-frame dependence, but also considers video content ina modeling process, so that the model can be adaptively adjusted according to the video content. The method has low implementation complexity; parameters used in the method are obtained from a video coding process, complicated calculation is not required, and therefore, video coding complexity will not be increased basically, and system delay can be avoided.

Description

technical field [0001] The invention relates to a frame-level quantization parameter calculation method suitable for HEVC video coding, which is suitable for improving the frame-level quantization parameter calculation method in HEVC code rate control and improving the D-q model in RDO (rate-distortion optimization) of HEVC. Background technique [0002] There are complex multi-level space-time domain dependencies in HEVC-compliant video coding, such as: distortions caused by intra- and inter-frame predictions will be transmitted in space-time domains; context-adaptive entropy coding will cause bit rates between adjacent coding units Consumption depends on each other, these make the frame-level quantization parameter (Q p ) calculation no longer satisfies the traditional assumption that coding units are independent of each other. Since all frames except the I frame in the group of pictures (GOP) are encoded by inter-frame prediction, the inter-frame dependence becomes the b...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04N19/147H04N19/19H04N19/124
CPCH04N19/124H04N19/147H04N19/19
Inventor 殷海兵李东黄晓峰
Owner HANGZHOU DIANZI UNIV
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