论文标题
Intra Intra 360^o视频编码的扭曲感循环滤波与等值的投影
Distortion-Aware Loop Filtering of Intra 360^o Video Coding with Equirectangular Projection
论文作者
论文摘要
在本文中，我们提出了一个失真感知的循环过滤模型，以提高360 $^o $ $ $ $视频的内部编码性能，该视频通过equirectandular投影（ERP）格式投影。为了实现失真的意识，我们提出的模块根据编码单元（CU）分区掩模分析内容特征，并通过部分卷积对其进行处理以激活指定区域。功能重新校准模块利用级联的剩余通道注意块（RCAB）自动调整通道间和通道内功能，能够自动调整质量不同的水平。感知几何优化与加权平方误差（WMSE）和感知损失相结合，可确保局部视野（FOV）和全局图像重建具有高质量的重建。广泛的实验结果表明，与锚（HM + 360LIB）相比，我们提出的方案可实现明显的比特率节省，从而在PSNR，WPSNR和PSNR方面平均降低了8.9％，9.0％，7.1％，7.1％和7.4％，分别为360^o的Luminance Compents的两种视图组件，以及PSNR。
In this paper, we propose a distortion-aware loop filtering model to improve the performance of intra coding for 360$^o$ videos projected via equirectangular projection (ERP) format. To enable the awareness of distortion, our proposed module analyzes content characteristics based on a coding unit (CU) partition mask and processes them through partial convolution to activate the specified area. The feature recalibration module, which leverages cascaded residual channel-wise attention blocks (RCABs) to adjust the inter-channel and intra-channel features automatically, is capable of adapting with different quality levels. The perceptual geometry optimization combining with weighted mean squared error (WMSE) and the perceptual loss guarantees both the local field of view (FoV) and global image reconstruction with high quality. Extensive experimental results show that our proposed scheme achieves significant bitrate savings compared with the anchor (HM + 360Lib), leading to 8.9%, 9.0%, 7.1% and 7.4% on average bit rate reductions in terms of PSNR, WPSNR, and PSNR of two viewports for luminance component of 360^o videos, respectively.
