Video diaries: a tool to investigate sustainability-related learning in threshold spaces     

Jane Roberts 《Environmental Education Research》2011,17(5):675-688

This paper takes as a case study an undergraduate field class from a UK university to rural Uganda. It describes and evaluates the use of video diaries as a tool for investigating the process of transformative learning in the context of education for sustainability. The applicability of threshold concept theory to this learning is investigated. Results show the video diary technique to be much more successful in capturing the development of student learning than written diaries. Despite some practical difficulties, rich data were generated. Analysis demonstrated that learning met three of the five criteria for threshold concepts: the learning was transformative, integrative and troublesome. Further research could test whether the learning in this case study met the threshold concept criterion of irreversibility. Further elaboration of the theoretical relationship between threshold concepts, transformative learning and education for sustainability is also needed. It is concluded that the video diary method is potentially transferable to other educational research contexts and may be particularly suitable for researching learning in threshold spaces.  相似文献   

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   

物体表面不同角度采集的三维图像配准的一种新算法     

衡伟 《东南大学学报》2005,21(4):411-413

提出了一种能有效实现物体表面三维图像数据配准的算法.该算法利用了三维数据采集时的三维点的阵列信息,这些三维点的阵列信息在采集原始三维数据时可以很容易获得,同时,还利用了三维数据矢量/顶点相似特征作为数据匹配的基础.采用迭代最小均方误差算法来自适应优化变换矩阵参数.这些方法可以有效地提高三维图像配准的性能,加快匹配过程的运算速度.实验结果表明该算法可以获得较好的配准后三维图像的主观效果.尽管该方法主要针对人头模型,但经过少许修改后即可适用于其他物体.  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   

开放式多通道数据采集系统硬件平台设计     

赵智宏  王庆琪  赵龙 《实验室研究与探索》2003,22(6):91-92

描述一个以ISA总线为依托而扩展成的多通道数据采集系统硬件平台，在这个平台上，用户可以根据自己的需要组成不同位数及不同采样速率的多通道数据采集系统。  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