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Time domain rate distortion optimization method based on distortion type propagation analysis

A rate-distortion-optimized, time-domain technology applied in the field of video codecs

Active Publication Date: 2020-06-19
UNIV OF ELECTRONIC SCI & TECH OF CHINA
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Problems solved by technology

[0023] In view of the above problems, in order to further optimize the time-domain rate-distortion optimization scheme under the LD coding structure, the present invention re-summarizes the time-domain distortion propagation based on the time-domain dependence relationship under the LD coding structure and the distortion propagation analysis in skip mode and inter mode. Dependent rate-distortion optimization problem, by constructing the time-domain distortion propagation chain, estimating the aggregate distortion of the current coding unit and the affected future coding units, calculating the propagation factor of the coding unit in the time-domain distortion propagation model, and then passing the more accurate propagation factor Adjust the Lagrangian multiplier to achieve time-domain dependent rate-distortion optimization, and use secondary encoding technology for I-frames to achieve time-domain-dependent rate-distortion optimization for I frames

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  • Time domain rate distortion optimization method based on distortion type propagation analysis
  • Time domain rate distortion optimization method based on distortion type propagation analysis
  • Time domain rate distortion optimization method based on distortion type propagation analysis

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Embodiment Construction

[0071] The present invention is described in detail below in conjunction with embodiment:

[0072] In order to simplify the implementation process of the global rate-distortion algorithm, the propagation factor κ i Modify the global Lagrangian multiplier λ directly in the VTM g . Since subsequent coding units are deriving the propagation factor κ i is not actually coded, so it is necessary to estimate the distortion of subsequent coding units.

[0073] In the case of a high bit rate, the coding distortion of subsequent coding units is likely to be inter distortion, and there is due to B i+1 is not coded, R i+1 unavailable, D i+1 Cannot be computed using (1.21), but at quantization step Q step next B i+1 The coding distortion of can be expressed as

[0074]

[0075] in An F(θ) curve can be fitted based on a large number of experiments with different quantization step sizes and encoding units, and a look-up table is established according to the curve to calculate ...

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Abstract

The invention belongs to the technical field of video encoding and decoding, and particularly relates to a time domain rate distortion optimization method based on distortion type propagation analysis. The method comprises the following steps of: analyzing according to a time domain dependency relationship under an LD structure and distortion propagation under a skip mode and an inter mode; the dependence rate distortion optimization problem based on time domain distortion propagation is reconcluded; a time propagation chain is constructed; estimating aggregation distortion of the current coding unit and the affected future coding unit; and calculating a propagation factor of a coding unit in the time domain distortion propagation model, further adjusting a Lagrange multiplier through themore accurate propagation factor to realize time domain dependence rate distortion optimization, and meanwhile, realizing time domain dependence rate distortion optimization of the I frame by using asecondary coding technology for the I frame.

Description

technical field [0001] The invention belongs to the technical field of video encoding and decoding, and in particular relates to a time-domain rate-distortion optimization method based on distortion type propagation analysis. Background technique [0002] Rate Distortion Theory (Rate Distortion Theory) is the basic theory of lossy coding. The rate-distortion optimization technology RDO (Rate Distortion Optimization) developed based on this theory is one of the important tools to improve coding efficiency and has been widely used in the field of video coding. . [0003] The performance of video coding needs to be measured by both coding bits and reconstruction distortion. On the one hand, when we want better video quality, the video coding bits will increase. On the other hand, at a lower coding bit level, the video distortion will increase. will be greatly increased, so there is a conflicting and mutually restrictive relationship between coding bits and reconstruction disto...

Claims

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Application Information

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IPC IPC(8): H04N19/147H04N19/172H04N19/51
CPCH04N19/147H04N19/51H04N19/172H04N19/567H04N19/109
Inventor 朱策邓玲玲蒋妮王秋月丁可可
Owner UNIV OF ELECTRONIC SCI & TECH OF CHINA
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