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An Efficient QP Variable Convolutional Neural Network Based In-loop Filter for Intra Coding

Authors :
Huang, Zhijie
Guo, Xiaopeng
Shang, Mingyu
Gao, Jie
Sun, Jun
Publication Year :
2020

Abstract

In this paper, a novel QP variable convolutional neural network based in-loop filter is proposed for VVC intra coding. To avoid training and deploying multiple networks, we develop an efficient QP attention module (QPAM) which can capture compression noise levels for different QPs and emphasize meaningful features along channel dimension. Then we embed QPAM into the residual block, and based on it, we design a network architecture that is equipped with controllability for different QPs. To make the proposed model focus more on examples that have more compression artifacts or is hard to restore, a focal mean square error (MSE) loss function is employed to fine tune the network. Experimental results show that our approach achieves 4.03\% BD-Rate saving on average for all intra configuration, which is even better than QP-separate CNN models while having less model parameters.<br />Comment: Accepted by DCC2021

Subjects

Subjects :
Computer Science - Multimedia

Details

Database :
arXiv
Publication Type :
Report
Accession number :
edsarx.2012.15003
Document Type :
Working Paper