裸眼3D视频教育应用价值分析

本文在介绍裸眼3D视频相关概念的基础上,通过介绍四种常见3D显示技术在教育中的应用情况及美国两个典型的裸眼3D视频教学实验案例,分析了裸眼3D视频在教育应用中的效果。进而总结了裸眼3D视频应用于教育的优势,论证了裸眼3D视频在教育中应用的价值所在。     

裸眼3D视频的教育应用研究

在介绍裸眼3D视频相关概念的基础上,简介了4种常见3D显示技术的教育应用特点,并通过设计实验和分析美国两个典型的裸眼3D视频教学实验案例,发现裸眼3D视频在创设身临其境的学习环境和提高学生在教学过程中的参与度方面有较好的成效,进而总结了裸眼3D视频应用于教育的优势,论证了裸眼3D视频在教育中应用的价值所在.     

3D电视视频质量评价的研究

本文在对3D电视视频技术研究的基础上,结合国际国内图像质量评价方法和图像质量评价要求,对影响3D视频节目质量的因素进行分析,并对影响因素进行测定,形成3D视频节目质量客观评价。     

基于三维变换域频谱差的视频显著性检测算法

显著性区域检测是计算机视觉的重要课题,对视频质量评价和感知视频编码算法优化也至关重要.大多显著性检测算法不能权衡准确率和复杂度,限制了它们在视频预处理和实时处理中的应用.提出了一种基于三维变换域频谱差(3DTDSD)的快速视频显著性检测算法,分别以关键帧及其前一帧为中心建立一定数量图像帧的滑动窗,得到两组3D视频体,用傅里叶变换将两组视频变换到三维频域,两组三维数据之间的差值经过反变换得到显著性图,最后通过连通分析、阈值判断等得到显著区域.频域算法具有运算速度快的特点,实验对比和算法复杂度分析证明了该算法的有效性和快速性.     

3D视频的错误隐藏快速算法

具有独特编码结构的3D视频在不可靠信道上传输时遭遇丢包后极易造成错误传播,因此研究基于3D视频的错误隐藏技术十分必要。而且,压缩后传输的3D视频数据量仍然较大,这对解码器的解码速度提出了很高的要求。如何在解码端加速进行错误隐藏是研究重点,通过快速定位静止宏块的方法加速错误隐藏速度。实验结果表明该算法在保证不降低视频的主、客观质量的同时,能有效地降低错误隐藏算法的复杂度。     

3D视频的质量损伤类型分析

首先介绍了3D视频通信系统和人类视觉系统,然后通过结构、颜色、运动和深度的4个视觉子系统,分析每个通信模块中各类立体质量损伤的现象、成因和解决办法.立体损伤与设备、表示方式、编解码算法以及主观感知等多重因素有关,了解质量损伤的类型有助于质量评价工作的进行,进而对系统的其他环节做出优化.     

基于单片机的嵌入式技术在3D视频游戏中的应用

近年来体感3D视频游戏风靡全球,此设计便是对体感3D视频游戏的一次探索和尝试。游戏由下位机和上位机两部分构成,下位机以C8051单片机为核心设计一个硬件电路,连接嵌入到鱼竿模型中的传感器中,负责采集并处理传感器信息。上位机以Virtools为开发工具,负责视频的输出控制。下位机根据上位机的请求通过串口向上位机传送控制信息,实现玩家通过真实的鱼竿在虚拟的屏幕中钓鱼的过程。     

3D立体图文的制作与展示技术

近些年来,随着3D立体显示技术的快速发展,相关硬件设备的逐步普及,市场对3D视频的编辑需求也在逐步上升。3D立体图文编辑作为3D视频编辑的重要组成部分,从最初的简单图文叠加,到目前虚拟三维场景与实际视频场景的完美融合,3D立体图文渲染技术结合智能交互技术,在多媒体交互展示方面也有着广泛的应用。     

基于NS2的IP网络视频传输质量评价研究及应用

分析了NS2中IP网络服务模型和数字视频编解码技术,实现了基于NS2的IP网络视频传输质量评价系统.提出了数字视频监控系统中视频传输质量评价网络模型,传输视频采用尽力而为和区分服务等方式.实验结果表明,该系统能正确评价视频传输的质量.     

基于跨层码率适配和差错控制的3D视频无线传输方法

针对纹理视频加深度序列的3D视频无线传输,本文提出一种基于跨层优化的码率适配和差错控制方法.通过最小化端到端3D视频失真,均衡调整和配置应用层3D视频编码的码率和帧内编码更新比例,以及物理层的调制和编码模式,达到信源码率适配信道带宽以及应用层差错控制和物理层信道保护强度相互平衡的目的,进而提高接收端的3D虚拟视点视频质量.实验结果表明,提出的方法能有效的提高3D视频无线传输的性能.     

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.     

基于视频加深度格式的立体视频技术分析

对现有视频加深度格式的立体视频进行了概括分析,简要介绍视频加深度的技术要点,即深度图像的获取、深度图像的压缩编码,以及图像的合成和质量的评价。同时提出了目前该格式存在的一些技术问题。该项技术尽管使现有深度提取技术有了很大进步,但建立精确的深度图仍然比较昂贵和困难。因此,如何获取高精度的深度图是该格式未来发展的关键,针对深度图像的压缩编码方案也需要进一步研究。     

3D visual experience oriented cross-layer optimized scalable texture plus depth based 3D video streaming over wireless networks

3D video streaming over the mobile Internet generally incurs the inferior 3D visual experience due to the time-varying characteristics of wireless channel. The conventional video streaming optimization methods generally neglect the harmony among different networking protocol layers. This paper proposes a cross-layer optimized texture plus depth based scalable 3D video streaming method to improve the expected 3D visual experience of the user by systematically considering the application layer texture-video/depth/FEC bit-rate allocation, MAC layer multi-channel allocation, and physical layer modulation and channel coding scheme (MCS) selection. In the cross-layer optimization, a networking-related 3D visual experience model which fuses the overlapped retinal view visual quality and depth sensation with mimicking human vision system is established to predict the 3D visual experience under the specific parameter configurations of different protocol layers. The efficiency and effectiveness of the proposed cross-layer optimized 3D video streaming method has been validated by subjective and objective experimental results.     

多视点与深度视频编码技术研究综述

多视点与深度视频(MVD)可以有效表示自由视点视频,减少了需传输视点的个数,该表达形式正受到越来越多的关注,如何对MVD进行高效编码尤为重要.介绍了自由视点视频的发展现状及国内外研究概况,详细讨论了深度图像的高效编码技术及多视点与深度联合编码技术,并对多视点与深度视频编码技术进行了总结及展望.     

3D Perception Algorithms:Towards Perceptually Driven Compression of 3D Video

In this paper, we summarize 3D perception-oriented algorithms for perceptually driven 3D video coding. Several perceptual effects have been exploited for 2D video viewing; however, this is not yet the case for 3D video viewing. 3D video requires depth perception, which implies binocular effects such as conflicts, fusion, and rivalry. A better understanding of these effects is necessary for 3D perceptual compression, which provides users with a more comfortable visual experience for video that is delivered over a channel with limited bandwidth. We present state-of-the-art of 3D visual attention models, 3D just-noticeable difference models, and 3D texture-synthesis models that address 3D human vision issues in 3D video coding and transmission.     

3D自由视点视频技术及其在中国馆中的应用

阐述了3D自由视点视频应用系统相关的关键技术,包括显示、内容获取与生成、编解码重构等,并对大屏幕3D自由视点视频技术在2010年上海世博会中国国家馆中的成功应用作了简要介绍。     

分布式2D视频到3D视频转换系统

2D-to-3D video conversion is a feasible way to generate 3D programs for the current 3DTV industry. However, for large-scale 3D video production, current systems are no longer ade-quate in terms of the time and labor required for conversion. In this paper, we introduce a distributed 2D-to-3D video conversion system that includes a 2D-to-3D video conversion module, architecture of the parallel computation on the cloud, and 3D video cod-ing in the system. The system enables coope-ration among multiple users in the simultane-ous completion of their conversion tasks so that the conversion efficiency is greatly pro-moted. In the experiments, we evaluate the system based on criteria related to both time consumption and video coding performance.     

Scalable 3D video streaming over P2P networks with playback length changeable chunk segmentation

3D video distribution over P2P networks has been thought as a promising way for 3D video entering home. The convergence of scalable 3D video coding and P2P streaming can provide diverse 3D experiences for heterogeneous clients with high distribution efficiencies. However, the conventional chunk segmentation and scheduling algorithms originally aiming at the non-scalable 2D video streaming are not very efficient for scalable 3D video streaming over P2P networks due to the particular data characteristics of scalable 3D video. Based on this motivation, this paper first presents a playback length changeable 3D video chunk segmentation (PLC3DCS) algorithm to provide different error resilience strengths to video and depth as well as layers with different importance levels in the 3D video transmission. Then, a hybrid-priority based chunk scheduling (HPS) algorithm is proposed to be tied in with the proposed chunk segmentation algorithm to further promote the overall 3D video P2P streaming performance. The simulation results show that the proposed PLC3DCS algorithm with the corresponding HPS can increase the success delivery rates of chunks with more important levels, and further improve the user’s quality of 3D experience.