3DV quality model based depth maps for view synthesis in FTV system     

张秋闻  安平  张艳  张兆杨  王元庆 《上海大学学报(英文版)》2011,15(4):335-341

Depth maps are used for synthesis virtual view in free-viewpoint television (FTV) systems.When depth maps are derived using existing depth estimation methods,the depth distortions will cause undesirable artifacts in the synthesized views.To solve this problem,a 3D video quality model base depth maps (D-3DV) for virtual view synthesis and depth map coding in the FTV applications is proposed.First,the relationships between distortions in coded depth map and rendered view are derived.Then,a precisely 3DV quali...  相似文献   

Video retargeting using optimized crop-and-scale     

薛银珠  杜欢  刘志  张兆杨 《上海大学学报(英文版)》2011,15(4):331-334

Mobile devices are increasingly powerful in multimedia transmitting and browsing. However, the small screen and different aspect ratios of mobile devices lower visual quality while watching images or videos. Video retargeting is aim at fitting an existing video into arbitrary size and aspect ratio. Previous content-aware retargeting methods are mostly high computational cost, which limits their applications on the portable devices with low computation ability. In this paper, a new crop-and-scale approach is presented to adapt video to better suit the target display. We automatically find the optimal parameters of cropping window using the dynamic programming method, and then scale it to fit the target display. The cropping window can smoothly shift during a shot to follow the movement of important objects. The retargeting results using our approach introduce no deformation and jitter effects over the whole video. Experimental results show the success of our approach on adapting a variety of source videos to small display sizes.  相似文献   

Language use in kindergarten science lessons: language production and academic language during a video feedback coaching intervention in kindergarten science lessons     

Astrid Menninga  Marijn van Dijk  Annemie Wetzels  Henderien Steenbeek  Paul van Geert 《Educational Research and Evaluation》2017,23(1-2):26-51

This paper aims to gain insight into language production and academic language of 4- and 5-year-old students and their teachers in the course of a teacher intervention during kindergarten science education. The study is based on videotaped classroom observations, and specifically focuses on the academic language use of students (N_intervention = 18, N_controls = 26) and teachers (N_intervention = 5, N_controls = 5). The results suggest that this general teacher intervention yields interesting changes in language use and production. Patterns of change over time confirm the idiosyncratic and non-linear nature of these changes. Science lessons represent an appropriate context in which to acquaint students with academic language, which can be used as a basis to build upon more sophisticated language skills.  相似文献   

网络体育直播的受众互动研究——以腾讯体育NBA频道为例     

张道升  陈子缘 《滁州学院学报》2019,(3):63-65,68

本文在深入剖析腾讯网NBA直播的方式与策略的基础上,提出了目前腾讯直播中存在的创新不够、直播人员专业性有待提高以及对用户服务力度不足等三个方面的问题。然后提出了腾讯体育NBA视频直播未来的发展方向:以互动性创新带动发展、提高直播人员专业性水平、优化用户的观赛体验等。最终以提高腾讯体育直播的受众互动性,从而提高腾讯体育直播在互联网时代多平台竞争下的竞争力,助力于网络视频体育直播的发展。  相似文献   

流媒体课件中流式素材的制作     

陈代武  贺文华 《娄底师专学报》2006,(6):47-49

探讨了流媒体课件中流式素材的制作，主要论述了流式文本、流式音频和流式视频素材的制作方法与制作技巧。给出了具体的制作实例，分析了流化的过程和流式文件的有关属性。  相似文献   

浅论视频会议给现代企业管理带来的机遇     

陈春香 《合肥教育学院学报》2007,24(2):118-120

视频会议是当前发展最快的多媒体通信方式，它克服了传统会议模式的种种弊端，并具备传统会议模式所无法具备的优势，它为企业在越来越激烈的竞争环境中获得更多及时、可信的信息，提高企业的决策速度和水平，从而使企业的管理水平提高，获得更多的市场机会和巨大的利益。  相似文献   

视频信息检索技术的发展及应用   总被引：4，自引：0，他引：4  

陈次白  季春  颜端武 《情报理论与实践》2005,28(5):542-545

今天视频检索的重要性已经越来越被人们所重视。本文总结了视频信息检索技术的发展历程、技术特点及国内外应用现状，最后预测了未来的发展趋势。  相似文献   

我国科技期刊视频摘要的社交化传播及其优化策略研究     

李杨  林芝 《编辑学报》2023,(4):434-438

通过对社交媒体平台上科技期刊视频摘要的实践进行梳理,总结我国科技期刊视频摘要社交化传播现状,并提出优化策略。在微信平台搜索“视频摘要”,并按一定标准筛选,对最终查找到的30本科技期刊的相关数据进行统计和分析。结果显示,社交平台上科技期刊论文视频摘要的识别检索存在一定困难,明确标注使用“视频摘要”的较少,不同科技期刊在公众号或视频号上的视频摘要传播效果存在差异。总体而言,我国科技期刊视频摘要相关实践已取得一定成效,但也存在一定问题,需进一步规范使用与清晰标注,强化社交化、多模态化与有策略的传播,以提升传播效果,并拓展学术成果传播的多样可能。  相似文献   

基于DirectX的多媒体播放器     

孙继红  王琴 《漯河职业技术学院学报》2011,10(2):17-19

利用DirectX9.0c提供的DirectX、AdioVideoPlayback等应用程序接口,用c#语言设计一个多媒体播放软件,实现基本的对音频、视频文件的播放控制,开发平台采用微软Visual Studio 2005。  相似文献   

Acquiring Clinical Knowledge from an Online Video Platform: A Randomized Controlled Experiment on the Relevance of Integrating Anatomical Information and Clinical Practice     

Johannes Grosser  Martina Bientzle  Thomas Shiozawa  Bernhard Hirt  Joachim Kimmerle 《Anatomical sciences education》2019,12(5):478-484

Basic subjects in medical education, such as anatomy, are often taught through teaching formats that do not always sufficiently demonstrate the relevance of this basic information for clinical practice. Accordingly, it is a recent trend in anatomy education to link anatomical information more explicitly to clinical practice. This article presents an online video platform (Tuebingen’s Sectio Chirurgica [TSC]) as one means of explicitly integrating preclinical anatomical knowledge and clinical application. The purpose of the study presented here was to examine the effects of videos through which medical students were educated about Anterior Cruciate Ligament reconstruction. A TSC video about this surgical procedure was compared to a video with a traditional lecture providing the identical information. Participants (n = 114) perceived the TSC video to be superior in comprehensibility of the presentation (P = 0.003) and conceivability of the surgical procedure (P = 0.027), and to be more entertaining (P < 0.001). Moreover, participants in the TSC condition acquired more clinical knowledge than in the lecture condition (P = 0.043) but did not differ in their acquisition of anatomical knowledge. Mediation analyses indicated that the effect on the acquisition of clinical knowledge was mediated by comprehensibility, conceivability, and entertainment. These findings are discussed regarding their implications for medical education in terms of contributing to the general trend of linking preclinical anatomical knowledge to clinical application. A discussion about the limitations of the study and suggestions for future research are also provided.  相似文献