国外动态

DVB 3DTV的商用指标草案通过 DVB组织已经通过了3DTV帧兼容平面立体视觉系统（Frame Compatible Plano-Stereoscopic System）的商业指标草案,该指标能兼容目前市面上的各种标准。     

3DTV播出系统介绍

本文介绍了3DTV播出系统,包括3DTV编码器系统和3DTV接收机。该系统采用创新的3DTV广播技术,左路和右路图像通过各自的视频编码器编码,再利用MPEG-2系统技术复用,保证了后续与传统的数字电视兼容。     

3D多视点立体显示及其关键技术

作为基于 DTV/HDTV 的二维(2D)显示之后的下一代视频显示技术,三维(3D)多视点立体显示已成为国际上的研究热点之一.为建立多视点立体显示系统,阐述了相关的关键技术,包括:光场表示模型和光场获取系统、高效的与现行视频标准兼容的多视点编码和传输方法、解码端任意位置视点的高效绘制方法、3D显示技术以及多视点自由立体显示.针对上述关键技术,分析了当前国际上的发展趋势及存在的问题,同时提出了一种基于交互式自由立体显示的 3D 视频处理系统的解决方案.     

一种3D视频中立体字幕叠加技术

运用3D字幕视差与背景景深的对应关系,基于立体视觉的双目视差原理叠加3D字幕,实现了基于三维图像内容的景深叠加3D字幕的系统.该立体字幕叠加方法具有简单、稳健等特点,缓解了观看时的视觉疲劳问题,使观众更舒适地观看立体图像和字幕.     

单反相机立体摄取镜头的研制

提出一种单镜头立体照相方案,通过对镜头立体光圈及其控制电路的设计,制造出用于单反数码相机的立体镜头,并分析该技术方案所获立体图像的特点.实践表明,该镜头结构简单、使用方便、能一次性形成多种立体图像,有利于立体照相技术的推广.     

单镜头真3D立体摄像技术*

【】针对集成成像技术记录立体图像显示深度小,图像摄取技术要求高等缺点,提出一种单镜头真3D立体摄像系统,并从系统结构、原理、核心元件参数设计、显示效果几方面对系统进行分析。研究表明,单镜头真3D立体摄像系统能记录与呈现更深的三维场景,并可在一定范围内进行焦距调整,其结构简单,有利于真3D立体图像技术推广,具有较高的研究与应用价值。     

基于单镜头基色立体图像摄取技术的研究

通过分析"双目视差立体成像"中的双机立体成像和双镜立体成像技术的不足,提出了一种用于单反相机的单镜立体照相方案,该方案通过对镜头中的光圈进行设计,可以实现双基色、三基色和七基色立体成像.该镜头与单反相机配合使用,可一次性拍摄多组互补色立体图像和左、右眼视差图像.实验结果表明,利用该技术实现的立体照相设备具有结构简单、操作方便、成像立体感强、无重影等特点,有利于立体照相技术的推广,并可扩展用于立体电视信号的采集、传输与接收系统中.     

裸眼3D技术嵌入式软件设计与研究

嵌入式设备是裸眼3D技术产业化的重要对象,其图像显示技术值得专门研究.应用Android SDK开发工具包及API和类库,在Eclipse集成开发环境下设计裸眼3D图像显示软件,完成自动识别屏幕分辨力、立体图像分辨力,使用低失真缩放与匹配技术完成立体图像融合,从而使双视图的立体图像在3D液晶显示屏上得到正确显示.     

嵌入式设备立体图像显示技术研究

便携式裸眼3D设备屏幕规格众多,在基于嵌入式系统多规格小尺寸液晶屏的便携式设备上实现立体显示效果,需在嵌入式系统支持下对立体图像进行缩放和插值处理,满足左右眼图像的准确观看。文章对安卓操作系统中3D图像处理进行研究,应用安卓提供的函数获取屏幕物理像素和图像实际分辨率,并根据二者的参数使用失真度小的线性缩放技术和列插值融合方法完成左右格式3D视频和图像的立体播放。在多规格普通2D液晶屏的便携式设备上进行了验证得到正确显示。     

基于视觉显著性图的立体图像视疲劳评价

随着立体显示技术的飞速发展,立体图像带来的视疲劳问题引发了人们的广泛关注.视觉显著性区域决定着立体图像的性质,而双目视差和观看时间是影响立体图像视疲劳程度的两个重要因素.为了评价观看立体图像后产生的视疲劳,提出了立体图像视疲劳的评价模型.该模型基于视觉显著性图,根据视差和观看时间得到对立体图像视疲劳的评价.生理心理实验表明,该模型预测结果的可靠率到达了93％以上,依据该评价模型可由视差和观看时间快速、准确地评价立体图像视疲劳,为立体图像视疲劳的评价及立体图像的改进提供了依据.     

Impact of 2D and 3D display watching on EEG power spectra: A standardized low-resolution tomography (sLORETA) study

We investigated whether watching two-dimensional television (2DTV) or three-dimensional television (3DTV) resulted in differences in the brain’s processing of sensory information. We divided 25 participants into 2DTV (n = 13) and 3DTV (n = 12) groups. Participants watched 2DTV or 3DTV for 1, 2, or 3 h on different days. Before and at the end of each session, electroencephalography (EEG) was recorded for 10 min. The Simulation Sickness Questionnaire (SSQ) and the Visual Analog Scale (VAS) were used to assess general discomfort before and after watching. Each frequency band of the resting EEG was transformed into a standardized low-resolution electromagnetic tomographic (sLORETA) image. In the 2DTV group, 2 h of watching increased theta power in the central cortex and 3 h of watching increased beta power in the occipital cortex. In the 3DTV group, 3 h of watching increased delta power in the parahippocampal gyrus and middle frontal cortex. Theta power was significantly higher in the insular cortex after 3 h of 3DTV than after 3 h of 2DTV. SSQ scores were significantly higher after 1 h of 2DTV than after 1 h of 3DTV. Watching 2DTV vs. 3DTV triggered different time-dependent activity patterns. Watching 3DTV for 3 h increased slow-wave activity in the prefrontal cortex, while watching 2DTV increased fast-wave activity in the occipitoparietal cortex. Up to 2 h of 3DTV watching did not cause major changes in fatigue or EEG activity compared with 2DTV. Our findings promise to be useful in designing safety guidelines for watching 3DTV.     

Synchronous 2D/3D Switching System for Service‐Compatible 3DTV Broadcasting

This paper proposes a new broadcasting system for the service‐compatible 3DTV in which the 3D service can coexist with the conventional digital TV broadcast. In the proposed system, the commercial 3DTV service can be implemented via the existing DTV channel without utilizing the dedicated 3DTV system. This 2D/3D system interworks with the conventional system and can switch to 2D or 3D service according to the broadcast programming and schedule. The system also provides a mechanism that can prevent the synchronization mismatch between left and right video streams and between the stream and the associated signaling in the 2D/3D transition periods. The picture quality measurements are carried out based on the ITU‐R recommended test to check the level of quality of service provided by the proposed scheme. The conformity tests are also performed with the conventional channel and the receiver for the DTV system to confirm the feasibility of the proposed one for the commercial service.     

有线网络开展3DTV技术方案与应用研究

提出了有线网络开展3DTV直播、点播、节目注入和有线网络传输、机顶盒解码显示等系列技术方案,介绍了3D影像的技术路标,给出了有线网络开展3DTV技术方案,包括3D电视直播、点播平台以及3DTV传输格式与信道编码.对设计方案进行了应用验证,同时对开展3DTV的商用性进行了分析.     

Small-world brain functional network altered by watching 2D/3DTV

With the development of display technology, the healthy problems caused by watching 2D/3DTV have received more and more attention. This paper utilized resting-state functional magnetic resonance imaging to study the changes of small-world brain network before and after one-hour 2D/3DTV watching, and explored the brain fatigue mechanism caused by watching 2D/3DTV. We conclude that one-hour watching of 2DTV will not increase the burden of brain. On the contrary, one-hour watching of 3DTV requires the brain to regulate the efficiency of brain areas, such as temporal lobe and occipital lobe, which may explain the fact that watching 3DTV can easier cause brain fatigue than watching 2DTV.     

Repetitive Delivery Scheme for Left and Right Views in Service‐Compatible 3D Video Service

This paper introduces a novel repetitive delivery scheme for the left and right views in service‐compatible (SC) 3D video that provides full backward compatibility to a legacy DTV system while retaining HD 3D visual quality without additional bandwidth or a codec over the legacy broadcasting channel. The proposed SC delivery scheme transmits individual view sequences of a 3D video in interlaced form, that is, a left‐view sequence of a 3DTV program to be used repeatedly is transmitted first and stored locally, and the right‐view sequence of the 3D program is then transmitted. This paper specifically describes the signaling, synchronization, and storage format methods used to validate the proposed SC delivery scheme. The experiment results show that the proposed SC delivery scheme can be effectively applied for an SC 3DTV service without degrading the DTV quality using only legacy DTV platforms.     

立体电视技术综述

随着数字电视技术和平板显示技术的发展,立体电视技术逐渐成为当前电视技术发展的新热点。本文主要从获取、压缩和显示三方面入手,结合三维领域多年来的技术进展,对立体电视技术进行了全面的描述,对近期在三维领域出现的新技术、新方法进行了扼要的介绍,探讨了其在立体电视技术中应用的可能性和可行性,并对未来立体电视技术的发展作出展望。     

An HDTV‐Compatible 3DTV Broadcasting System

We introduce a high‐definition three‐dimensional television (3DTV) broadcasting system that is fully compatible with the existing transmission system of high‐definition television (HDTV). Specifically, we developed high‐definition 3DTV broadcasting subsystems including a 3DTV camera, 3DTV video multiplexer and demultiplexer, 3DTV receiver, and 3DTV outdoor broadcast van. To verify the developed subsystems, we performed experimental services of 3DTV broadcasting during the 2002 FIFA World Cup Korea/Japan.. According to our subjective evaluation test, 88% of 273 viewers rated the perceived depth of 3DTV as “Good,” and 36% of the viewers preferred 3DTV to other digital broadcasting services.     

立体电视综合测试卡设计一例

针对于立体电视的质量检测需求,提出了一种立体电视综合测试卡设计,并予以实施。该设计以2D电视综合测试卡为基础,尝试性地将与多项立体成像性能相关的图形要素集中安置在卡的中部,分别用来检查立体显示效果和左右视图的正反,检测左右视图的亮度差、基色差、中心重合度和串扰率(含不同视角),测量3个不同成像层面上(屏前、屏上及屏后)的水平和垂直清晰度。此外,根据实际需要和相关要求,增加了用于检测音视频同步性的要素。     

3D电视系统的构成及发展

主要介绍了3D电视系统的现状与发展,按照由双视点向未来多视点3D电视系统发展的技术路线,依次介绍了各阶段系统的架构.同时,对关键技术的基本原理也做了详细说明,包括过度阶段的帧兼容、多视点视频编码、混合分辨率视频编码、视频与相应深度信息联合编码等解决方案.最后对3D电视系统中有待解决的问题和未来的研究方向进行了总结.