Liqun Lin , Yanting Wang , Jiaqi Liu , Hongan Wei , Bo Chen , Weiling Chen , Tiesong Zhao
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引用次数: 0
Abstract
The popularity of 360° video is due to its realistic and immersive experience, but the higher resolution poses challenges for data transmission and storage. Existing compression schemes for 360° videos mainly focus on spatial and temporal redundancy elimination, neglecting the removal of visual perception redundancy. To address this issue, we exploit the visual characteristics of 360° equirectangular projection to extend the popular Just Noticeable Difference model to Spherical Just Noticeable Difference. Our modeling takes advantage of the following factors: regional masking factor, which employs an entropy-based region classification and separately characterizes contrast masking effects on different regions; latitude projection characteristics, which model the impact of pixel-level warping during equirectangular projection mapping; field of view attention factor, which reflects the attention variation of the human visual system on 360° display. Subjective tests show that our Spherical Just Noticeable Difference model is consistent with user perceptions and also has a higher tolerance of distortions with reduced bit rates of 360° pictures. Further experiments on Versatile Video Coding also demonstrate that the introduction of the proposed model significantly reduces bit rates with negligible loss in perceived visual quality.
期刊介绍:
Signal Processing: Image Communication is an international journal for the development of the theory and practice of image communication. Its primary objectives are the following:
To present a forum for the advancement of theory and practice of image communication.
To stimulate cross-fertilization between areas similar in nature which have traditionally been separated, for example, various aspects of visual communications and information systems.
To contribute to a rapid information exchange between the industrial and academic environments.
The editorial policy and the technical content of the journal are the responsibility of the Editor-in-Chief, the Area Editors and the Advisory Editors. The Journal is self-supporting from subscription income and contains a minimum amount of advertisements. Advertisements are subject to the prior approval of the Editor-in-Chief. The journal welcomes contributions from every country in the world.
Signal Processing: Image Communication publishes articles relating to aspects of the design, implementation and use of image communication systems. The journal features original research work, tutorial and review articles, and accounts of practical developments.
Subjects of interest include image/video coding, 3D video representations and compression, 3D graphics and animation compression, HDTV and 3DTV systems, video adaptation, video over IP, peer-to-peer video networking, interactive visual communication, multi-user video conferencing, wireless video broadcasting and communication, visual surveillance, 2D and 3D image/video quality measures, pre/post processing, video restoration and super-resolution, multi-camera video analysis, motion analysis, content-based image/video indexing and retrieval, face and gesture processing, video synthesis, 2D and 3D image/video acquisition and display technologies, architectures for image/video processing and communication.