音视频传输系统中的网络融合

基于音视频系统对IT技术的需求,分析在进行AV传输系统设计中,重点考虑网络拓扑结构、服务质量管理、PTP时钟三个问题。     

一种免除二值化的视频叠加中文字符识别方法

提出一种新的用于识别视频中字幕文字的方法。鉴于视频中文字的大小、颜色、渲染风格和分辨率的不同,以及视频中各种复杂背景的影响,识别视频中的叠加文字是一个尚未解决的问题。目前,大多数视频叠加文字识别方法都基于视频文字的二值化和传统OCR引擎的结合。然而,二值化过程容易引入噪声和文字笔划信息的丢失。另外,传统OCR技术主要专注于高分辨率的扫描打印文档,这些文档具有背景单一、噪声少和笔划信息较完整的特点。因此,传统OCR引擎用于识别叠加文字二值化后的结果可能不够鲁棒。为解决这个问题,直接从未二值化的叠加视频文字图像中提取Gabor特征用于训练二层字符识别器。实验结果表明,本文提出的方法在多字体视频叠加中文文字识别上有良好的效果。     

摄像与计算机辨析终点裁判管理系统的研制

阐述了利用摄像与计算机图像辨析技术完成终点计时、裁判工作的必要性和可行性.通过系统结构、系统运用原理、使用结果,说明运用该系统可以使体育比赛的编排、记录、计时、裁判工作实现自动化,终点计时、裁判管理科学化和现代化,做到比赛公正、高效.     

浅议字幕机在视频系统中的迎接和使用

字幕机是音像教材制作必不可少的设备之一，将其以不同的方式与视频系统相互连接，与视频切换台相互配合，取长补短，方能产生完美的特技效果。     

‘You should collaborate,children’: a study of teachers’ design and facilitation of children’s collaboration around touchscreens

Touchscreens are being integrated into classrooms to support collaborative learning, yet little empirical evidence has been presented regarding how children collaborate using touchscreens in classrooms. In particular, minimal research has been directed towards how teachers can design for and guide children’s touchscreen-based collaboration. Concurrently, the Programme for International Student Assessment and other international organisations have highlighted collaboration and ICT skills as crucial competencies for mastery in the twenty-first century. Accordingly, this article presents three narrative cases from a touchscreen project in Denmark, where 41 second-grade children and three teachers from two classrooms participated. The cases are based on ethnographic field data and 150 hours of video footage of natural occurring interaction in classroom settings. The ethnographic field data and video footage are examined using a collaboration model and embodied interaction analysis. Each case presents features of the subtle processes of children’s collaboration around touchscreens and teachers’ role in designing and guiding such collaboration. Thus, this article illustrates teachers’ and children’s situated processes of integrating touchscreens for collaborative activities in their classrooms.     

局域网客户机有盘与无盘的快速切换

本文介绍一种可根据教学安排 ,将局域网的全体客户机切换成无盘工作站进行DOS教学 ,切换成有盘工作站进行Windows98教学的快速、有效方法 .     

搜索技术的现状及发展前景

对搜索引擎的排序规则、语义理解能力、双字节处理水平和个性化搜索的技术局限和发展现状进行了分析,对桌面搜索、视频搜索和搜索引擎的细化、全能化发展趋势进行了研究。     

现代通信技术在教学中的应用

本文介绍了现代通信技术在教学上应用的重要性及其应用领域,建校园Intranet网并应用WWW是最好的途径。     

A coach’s political use of video-based feedback: a case study in elite-level academy soccer

This paper examines the video-based pedagogical practices of Terry (pseudonym), a head coach of a professional junior academy squad. Data were collected through 6 in-depth, semi-structured interviews and 10 field observations of Terry’s video-based coaching in situ. Three embracing categories were generated from the data. These demonstrated that Terry’s video-based coaching was far from apolitical. Rather, Terry strategically used performance analysis technologies to help fulfil various objectives and outcomes that he understood to be expected of him within the club environment. Kelchtermans’ micropolitical perspective, Callero’s work addressing role and Groom et al.’s grounded theory were primarily utilised to make sense of Terry’s perceptions and actions. The findings point to the value of developing contextually grounded understandings of coaches’ uses of video-based performance analysis technology. Doing so could better prepare coaches for this aspect of their coaching practice.