H.264在网络视频监控系统中的应用研究

由于具有压缩率高、图像失真率低、网络适应性强的特点,H.264已经成为网络视频监控系统应用研究中的热门。针对视频压缩效率和实时传输之间的矛盾,以及视频图像质量要求的提高,根据H.264和网络监控系统的技术原理,分析了H.264在网络视频监控系统中的应用优势和可行性,旨在提出一套基于H.264的网络监控系统解决方案。     

Web search engine multimedia functionality

Web search engines are beginning to offer access to multimedia searching, including audio, video and image searching. In this paper we report findings from a study examining the state of multimedia search functionality on major general and specialized Web search engines. We investigated 102 Web search engines to examine: (1) how many Web search engines offer multimedia searching, (2) the type of multimedia search functionality and methods offered, such as “query by example”, and (3) the supports for personalization or customization which are accessible as advanced search. Findings include: (1) few major Web search engines offer multimedia searching and (2) multimedia Web search functionality is generally limited. Our findings show that despite the increasing level of interest in multimedia Web search, those few Web search engines offering multimedia Web search, provide limited multimedia search functionality. Keywords are still the only means of multimedia retrieval, while other methods such as “query by example” are offered by less than 1% of Web search engines examined.     

射频识别技术在图书档案馆中的应用研究

对射频识别技术的系统组成及工作原理进行概述,并比较射频识别技术与条形码技术的不同。对射频识别技术在国内外图书档案馆中应用的实例进行分析,对使用射频识别技术的利弊进行比较,得出应在图书档案馆中推广使用射频识别技术的结论,并指出射频识别技术在图书档案馆中的应用前景。     

谈Delphi中的流

数据流是面向对象程序设计语言中面向对象思想的典型体现,它彻底地取代了早期的利用函数实现输入输出的功能,克服了用函数实现输入输出功能的诸多弊端。简单来说,流就是建立在面向对象基础上的一种抽象的处理数据的工具。在Delphi的早期版本Turbo Pascal中就曾有流(Stream)、群(Collection)和资源(Resource)等专门用于对象式数据管理的类。在Delphi中,这些功能得到了大大的加强。Delphi将对象式数据管理类归结为Stream对象(Stream)和Filer对象(Filer),并将它们应用于可视部件类库(VCL)的方方面面。它们不仅提供了在内存、外存和Windows资源中管理对象的功能,还提供了在数据库BLOB字段中对象的功能。本文介绍Delphi编程中流的概念及应用。     

一种基于视频的DEW水印算法

采用差分能量水印(DEW)算法,对视频数字作品进行了数字水印的嵌入、检测和提取研究。实验结果表明,该算法计算简单、速度快、易于实现,视频信号里可编码的数据量大,可以隐藏较多的信息,并且还可以满足水印的实时嵌入和提取。     

Childhood emotional abuse characteristics moderate associations with adult psychopathology and caregiving

As the consequences of childhood maltreatment for adult adjustment become increasingly established in the literature, investigations of individual differences in these effects must evolve to examine more nuanced components of the maltreatment experience. This is particularly true for studies of childhood emotional abuse (CEA), which represents an umbrella label for numerous qualitatively different experiences. The present study examined the distinct contributions and potential interactive effects of CEA frequency and intensity on adult psychopathology, caregiving behaviors, and caregivers’ representations of the caregiver-child relationship in a diverse sample of 62 female caregivers of 4-year-old children, all of whom had experienced CEA. Frequency and intensity emerged as orthogonal characteristics of CEA with differential effects on adult adaptation. Higher CEA frequency predicted increased adult psychopathology, whereas higher CEA intensity predicted increased boundary dissolution in caregivers’ representations. Further, an interaction between frequency and intensity predicted negativity in caregivers’ representations, such that higher frequency of high intensity, but not low intensity, CEA predicted decreased negativity. Neither frequency nor intensity of CEA predicted observed caregiving behaviors. These results provide evidence that characteristics of CEA signal important differences in its experience, with differential implications for later adjustment. The specific differences in caregiving representations associated with high vs. low intensity CEA suggest that diverging mechanisms by which these experiences eventuate in adult outcomes should also be investigated. Above all, this study suggests that the measurement of CEA, and childhood maltreatment broadly, will benefit from enhanced attention to specific characteristics of individuals' experiences.     

Flash中声音与动画同步的实现

在Flash中利用“NULLSOUN”stream技术可以比传统的声音stream技术节约90%的文件体积大小,并保持声音和动画完全同步．     

视频会议系统及其在远程教育中的应用

本文论述了视频会议系统的概念、分类、特点及系统的组网标准，阐述了正确选用标准的重要性并介绍了最新视频传输技术的协议规范H．323标准。文中重点讨论了视频会议系统应用于远程教学的主要功能及典型应用方案。     

大学视频公开课的价值探讨及案例分析

大学视频公开课是在线开放课程中的一种,它仅通过授课视频完成课程内容的教学,具有明显的导论和科普特征。提高公众的科学、文化素养是大学精品视频公开课的价值所在。建设视频公开课,需要明确课程教学目标,并依据教学目标来选择、提炼教学内容。在制作教学视频时要关注学习者的体验,确保成片中的多媒体演示及板书完整、清晰。