全向视频可为用户获得身临其境的体验，高动态范围（HDR）立体全向视频能获得更多场景细节，是该领域发展方向。HDR立体全向视频系统的成像、内容表示、显示、交互等方式明显区别于非全向立体视频系统。其内容获取会产生HDR重建失真、拼接失真、绘制失真等，经投影、编码、色调映射等处理后形成更复杂的多失真，可导致视觉体验质量(感知质量与视觉舒适度)下降。同时，HDR立体全向视频通常采用近眼显示的头戴式显示器(HMD)，导致其视觉不舒适问题更突出。如何评价其视觉体验质量是该领域的核心问题。本项目将深入研究该问题，建立面向HMD的HDR立体全向视频的视觉感知特性模型，基于该模型探索不同失真/要素对感知质量与视觉舒适度的影响机理，针对复杂的多失真问题，提出有效的感知质量与视觉舒适度客观评价模型；基于评价模型提出用户端视频内容重建的优化方法，为解决HDR立体全向视频的视觉体验质量评价问题提供相关理论方法。

Omnidirectional video can provide the user with an immersive experience. High dynamic range (HDR) stereoscopic omnidirectional video can get more details of the scene, and is the direction of the development of multimedia system. The imaging, content representation, display and interaction of the HDR stereoscopic omnidirectional video system are obviously different from the non omnidirectional stereoscopic video systems. The content acquisition of HDR stereoscopic omnidirectional video system will produce HDR reconstruction distortion, splicing distortion, rendering distortion, and so on; the followed processing of projection, coding and tone mapping will lead to more complex multi distortion. All of these result in the decrease of visual experience quality (perceptual quality and visual comfort). Meanwhile, HDR stereoscopic omnidirectional video system usually uses a head mounted display with a near eye display, resulting in more prominent visual discomfort. How to evaluate the quality of visual experience is the core issue in this field. This project will study the problem deeply and establish a visual perception feature model for HMD oriented HDR stereoscopic omnidirectional video. Based on this model, the effects of different distortions/elements on perceptual quality and visual comfort are explored. Aiming at complex multi distortion problem, objective evaluation models of perceptual quality and visual comfort will be proposed. Based on the evaluation models, the optimization method of user side video content reconstruction will be discussed, which provides relevant theoretical methods for solving the problem of HDR stereoscopic omnidirectional video visual experience quality evaluation.