Compressed video quality enhancement method based on spatio-temporal information balance

A video quality, spatiotemporal technology, applied in the field of video processing, can solve the problems of limited effect, limited enhancement effect, lossy video, etc., to achieve the effect of improving the effect

Active Publication Date: 2022-07-29
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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Problems solved by technology

However any error in the optical flow calculation will introduce new artifacts around the image structure in the aligned adjacent frames
At the same time, accurate optical flow estimation is itself challenging and time-consuming, so the quality enhancement effect of this invention is still limited
And a separate model is used for PQF, although it can improve the enhancement effect of PQF, it will significantly increase the computational cost
[0008] To sum up, due to the limitations of storage devices and transmission bandwidth, video is usually compressed in a lossy manner
However, although lossy coding reduces the size

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  • Compressed video quality enhancement method based on spatio-temporal information balance
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  • Compressed video quality enhancement method based on spatio-temporal information balance

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[0039] For the convenience of those skilled in the art to understand the technical content of the present invention, the following technical terms are first described:

[0040] H.264 / AVC: H.264 is a highly compressed digital video codec standard proposed by the Joint Video Group jointly formed by the ITU-T Video Coding Experts Group (VCEG) and the ISO / IEC Moving Picture Experts Group (MPEG).

[0041] H.265 / HEVC: It is a new video coding standard developed after H.264, which retains some technologies of the original H.264 coding standard and improves some technologies at the same time. New techniques are used to improve the relationship between code stream, encoding quality, latency and algorithm complexity in order to achieve optimal settings.

[0042] Quantization: refers to the process of mapping a continuous value of a signal (or a large number of possible discrete values) into a finite number of discrete values, so as to realize many-to-one mapping of signal values.

[00...

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Abstract

The invention discloses a compressed video quality enhancement method based on spatio-temporal information balance, which is applied to the field of video processing and aims to solve the problem that the video quality is reduced in the existing compression technology. According to the method, a plug-and-play spatio-temporal information balance module is adopted, spatial features and time features are extracted, and the extracted time features and spatial features are aligned again in a feature space; noise and redundant time information introduced by alignment can be effectively removed; meanwhile, the space-time information proportion can be adaptively balanced, and the unified modeling problem of the PQF and the non-PQF is solved. And the effect of the existing video quality enhancement method can be obviously improved.

Description

technical field [0001] The invention belongs to the field of video processing, and particularly relates to a video compression technology. Background technique [0002] The most commonly used H.265 / HEVC standard now adopts a block-based hybrid coding framework, and its core processes include: predictive coding, transform coding, quantization and entropy coding, and block-based prediction. Transform and quantization operations ignore block-to-block correlations, resulting in coded reconstructed images exhibiting blockiness, i.e. apparent discontinuities at block boundaries that can be perceived by the human eye (when the step size is large and the bit rate is low, these The effect is more obvious); at the same time, quantization is based on block expansion in the transform domain, and this quantization process is irreversible. In addition, high-precision interpolation in motion compensation is prone to ringing effects. Due to the accumulation of errors in the inter-frame co...

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Application Information

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IPC IPC(8): H04N19/154H04N19/20H04N19/48
CPCH04N19/48H04N19/154H04N19/20
Inventor 叶茂王泽洋
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA
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