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Sakunthala Yatigammana Ekanayake 《Learning, Media and Technology》2014,39(2):229-249
This article reports a study into how mobile phones could be used to enhance teaching and learning in secondary school science. It describes four lessons devised by groups of Sri Lankan teachers all of which centred on the use of the mobile phone cameras rather than their communication functions. A qualitative methodological approach was used to analyse data collected from the teachers' planning, observations of the lessons and subsequent interviews with selected pupils. The results show that using images and video captured on mobile phones supported the teachers not only in bringing the outside world into the classroom but also in delivering instructions, in assessing students' learning and in correcting students' misconceptions. In these instances, the way the images from the mobile phone cameras supported students' learning is explained using a variety of approaches to understand how images support learning. 相似文献
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数码相机抖动模糊图像的恢复 总被引：1，自引：0，他引：1
张博夫 《深圳职业技术学院学报》2010,9(5):36-41
分析数码相机抖动过程,根据曝光时间的长短,将相机抖动模糊图像分为匀速运动模糊失真图像和双影模糊失真图像2类．匀速运动模糊失真图像的点扩散函数（PSF）为矩形,直接调用MATLAB中点扩散函数的创建函数和维纳滤波图像恢复函数,可实现图像恢复．双影模糊失真图像的点扩散函数较复杂,在一定的先验假设条件下,本文提出斜坡型、正弦型、抛物线型等3种近似模型,分别给出它们的数学表达式,并在MATLAB平台上创建相应的点扩散函数,再调用MATLAB中的维纳滤波图像恢复函数,可实现图像恢复． 相似文献
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Inés Márquez Chisholm 《Technology, Pedagogy and Education》2013,22(2):213-228
ABSTRACT American classrooms are experiencing a rapid growth in cultural and ethnic diversity, as well as an increase in educational classroom computing. Because culture directly affects classroom organisation and classroom learning, teachers need to understand, incorporate, and support their students’ cultures. Furthermore, since educational computing is not culturally neutral, teachers in culturally diverse settings must integrate the computer culture, the classroom culture, and students’ learning preferences. To meet the need for culturally and technologically competent multicultural teachers, teacher education programs must first define both cultural competency and computer competency. After examining the relationship between culture and educational computing, the paper explores some essential components of cultural and technological competency for multicultural teachers. Finally, it indicates the need for further research on the interaction of culture and technology in the multicultural classroom. 相似文献
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李俊霞 《湖北广播电视大学学报》2013,(11):98-99
摄像头的安装与使用在预防和打击违法犯罪,保障公民人身财产安全方面发挥着强大的作用,但是“铺天盖地”的摄像头也催生了许多的法律纠纷,如侵犯公民隐私权的情况频频出现.有鉴于此,摄像头的安装和使用亟待法律规制,否则其用途就有可能被异化. 相似文献
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针对目前智能手机人工贴屏精度差、效率低、成本高的现状,文章提出了一种基于双目机器视觉的高速高精度自动贴屏解决方案。该方案采用两个CCD相机分别采集手机机身和手机屏幕图像,经图像采集、图像预处理后,快速提取图像边缘信息,准确快速计算XY轴向偏差和R向角度偏差,并由XYR对位平台快速完成对位调整。经测试,该设备定位精度≤±0.005mm,重复定位精度≤±0.005mm,贴屏速度≥300片/小时,屏幕贴合平整度≤±0.005mm,能大幅提升贴屏精度和效率,具备一定的应用和推广价值。 相似文献
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王丹 《沈阳教育学院学报》2004,6(3):102-103
虚拟演播室技术是目前电视领域里应用的比较广泛而且比较成熟的技术。它的应用大大减少了制作节目的成本和制作的周期，更重要的是为节目制作场景提供了更广阔的想象空间。同时也克服了传统布景不宜随便搬动，灵活性差，场地不能重复利用的缺点。 相似文献
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基于ARM体系的RISC设计思想,给出了基于ARM处理器的USB摄像头视频播放器的设计方案.通过基于三星公司的S3C2410A作为图像处理和中央控制芯片硬件平台上配置嵌入式Linux操作系统,并将Linux上编译好的视频采集程序镜像移植到硬件平台上,来采集连接在USB接口上的USB摄像头,并显示在与S3C2410A相连接的液晶显示器上. 相似文献
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Bubble formation in an opposite-flowing T-shaped microchannel with 40 μm in depth and 120 μm in width was real-time visualized and investigated experimentally by means of a high speed camera. N2 bubbles were generated in glycerol-water mixtures with different concentrations of surfactant sodium dodecyl sulfate (SDS). And the images were captured by the high speed camera linked to a computer. Results indicated that the bubble formation process can be distinguished into three consecutive stages, i.e., expansion, collapse and pinching off. The bubble size decreases with the increase of liquid flow rate and viscosity of liquid phase as well as the decrease of gas flow rate. The surface tension of the liquid phase has no measurable influence on the bubble size. Moreover, a new approach to predicting the size of bubbles formed in the T-shaped microchannel is proposed. And the predicted values agree well with the experimental data. 相似文献