Lightweight macro-pixel quality enhancement network for light field images compressed by versatile video coding

IF 2.6 4区计算机科学 Q2 COMPUTER SCIENCE, INFORMATION SYSTEMS Journal of Visual Communication and Image Representation Pub Date : 2024-10-30 DOI:10.1016/j.jvcir.2024.104329

Hongyue Huang , Chen Cui , Chuanmin Jia , Xinfeng Zhang , Siwei Ma

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Abstract

Previous research demonstrated that filtering Macro-Pixels (MPs) in a decoded Light Field Image (LFI) sequence can effectively enhances the quality of the corresponding Sub-Aperture Images (SAIs). In this paper, we propose a deep-learning-based quality enhancement model following the MP-wise processing approach tailored to LFIs encoded by the Versatile Video Coding (VVC) standard. The proposed novel Res2Net Quality Enhancement Convolutional Neural Network (R2NQE-CNN) architecture is both lightweight and powerful, in which the Res2Net modules are employed to perform LFI filtering for the first time, and are implemented with a novel improved 3D-feature-processing structure. The proposed method incorporates only 205K model parameters and achieves significant Y-BD-rate reductions over VVC of up to 32%, representing a relative improvement of up to 33% compared to the state-of-the-art method, which has more than three times the number of parameters of our proposed model.

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通过多功能视频编码压缩光场图像的轻量级宏像素质量增强网络

以往的研究表明，对解码光场图像（LFI）序列中的宏像素（MP）进行过滤，可有效提高相应子孔径图像（SAI）的质量。在本文中，我们针对多功能视频编码（VVC）标准编码的光场图像，提出了一种基于深度学习的质量增强模型，该模型采用了MP-wise处理方法。所提出的新型 Res2Net 质量增强卷积神经网络（R2NQE-CNN）架构既轻便又强大，其中首次采用了 Res2Net 模块来执行 LFI 过滤，并通过新型改进 3D 特征处理结构来实现。所提出的方法仅包含 205K 个模型参数，与 VVC 相比，Y-BD 速率显著降低了 32%，与最先进方法相比，相对改进高达 33%，而最先进方法的参数数量是我们所提出模型的三倍多。

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来源期刊

Journal of Visual Communication and Image Representation 工程技术-计算机：软件工程

CiteScore

5.40

自引率

11.50%

发文量

188

审稿时长

9.9 months

期刊介绍： The Journal of Visual Communication and Image Representation publishes papers on state-of-the-art visual communication and image representation, with emphasis on novel technologies and theoretical work in this multidisciplinary area of pure and applied research. The field of visual communication and image representation is considered in its broadest sense and covers both digital and analog aspects as well as processing and communication in biological visual systems.