人体运动图像边缘处理     

邹亮畴  范毅方  袁支润  丁焕香 《广州体育学院学报》2004,24(2):35-37

根据人体运动图像的特点，引用图像层的平滑处理和图像层的边缘处理获得了较好的人体运动边缘图像，通过轮廓跟踪能较好地提取了人体运动图像边缘，为研究人体运动图像质心定位作好了准备。同时也为处理人体运动图像提供了一种新的方法。  相似文献   

How repeated studying and testing affects multimedia learning: Evidence for adaptation to task demands     

《Learning and Instruction》2016

Two biases can occur in multimedia learning: overconfidence and over-reliance on text processing. The present research sought to identify these biases and to investigate whether they can be reduced, and hence learning fostered, when studying and testing are repeated. In 2 experiments (Exp.1: N = 79, Exp.2: N = 52), students learned either with text only or with text and pictures (multimedia) about how the toilet flush works, gave judgments-of-learning (JOLs), were tested on the learning contents; afterwards this study-test cycle was repeated. Results from both experiments revealed stronger overconfidence due to multimedia in both study-test cycles (JOLs higher than learning outcomes). Eye movement data showed a relative increase in attention on the picture versus text from cycle 1 to cycle 2; this relative increase in attention was related to better learning outcomes. Repeated studying and testing thus helped to reduce over-reliance on text processing in multimedia learning, fostering performance.  相似文献   

一种在轨海上多运动舰船目标检测和跟踪方法     

矫腾章  胡玉新  吕鹏  张凯  台宪青 《中国科学院大学学报》2020,37(3):368-378

传统遥感卫星图像处理采用在地面进行目标检测和跟踪处理的模式，卫星将拍摄到的图像数据下传至地面数据处理中心，由地面数据处理系统对接收到的遥感图像数据进行目标检测和跟踪。然而，随着遥感图像分辨率的不断提高，需要下传的数据量增大，导致星地数据传输的时间大大增加，最终造成目标检测和跟踪的时效性降低。针对上述问题，提出一种基于多特征量判别的Canny边缘检测和联合概率数据关联的在轨海上多运动舰船目标检测和跟踪方法。将该方法利用中国科学院微小卫星创新研究院的高分微纳卫星实测数据在模拟星载的嵌入式开发平台上进行验证，结果表明该方法能够在轨对海上多运动舰船目标进行快速、准确的检测和跟踪。  相似文献   

Socioeconomic segregation between and within curriculum tracking     

《International Journal of Educational Development》2021

Previous studies have documented social segregation for single types of tracking, but little previous research has compared levels of segregation across different institutional tracking arrangements. This paper uses extensive administrative data of the Chilean educational system to estimate the magnitude and evolution of socioeconomic segregation between- and within-school curriculum tracking. Results indicate that the unequal distribution of students by socioeconomic status between tracks narrows when tracking takes place within schools, mainly in the presence of market incentives that lead schools to focus on particular student populations.  相似文献   

错误结果反馈对追踪任务学习迁移的影响   总被引：1，自引：0，他引：1  

金亚虹  章建成  任杰 《上海体育学院学报》2010,34(2)

采用电脑追踪任务探讨错误结果反馈(KR)对运动技能学习迁移的影响.抽取在校大学生,随机分为正确KR组、错误KR组、混合KR组(组间性别均衡设计).在第1-3 d,3组受试者练习时分别获得正确的KR、错误的KR,或者获得25次正确KR后,再获得25次错误KR.正确的KR是每次追踪误差的毫秒数,错误的KR则是正确KR数值+10 mm.在第4 d,3组受试者分剐在无KR的条件下,用原任务进行保持测试10次,之后再操作两个迁移任务各10次.显示:KR在一致性时机任务和电脑追踪任务中的作用机理类似,当可以获得KR时,学习者将它作为觉察和纠正操作错误的信息源:错误KR会带来迁移测试绩效的偏差.提示:学习者形成自身觉察错误能力是运动技能学习的关键,实践工作者应根据运动情境的特点,合理地提供结果反馈,以促进运动技能的学习.  相似文献   

基于协同表示的目标跟踪算法     

王海军  张圣燕 《中国科学院大学学报》2016,33(1):135-143

提出一种基于协同表示的新的目标跟踪算法.在贝叶斯框架下,采用基于重构误差的观测似然函数和考虑遮挡的模型更新机制设计一个鲁棒的跟踪器.用l₁范数来建模重构误差以更好地容忍奇异值,同时用协同表示对编码系数进行约束.实验结果表明,和其他算法相比,本文算法能够战胜遮挡、尺度变化、光照变化、背景混乱等干扰因素,具有较高的准确度和鲁棒性.  相似文献   

Validity of Self-Reported Pedometer Steps per Day in College Students     

Brittany Star Overstreet  Scott E. Crouter  George A. Butler  Cary M. Springer  David R. Bassett 《Measurement in physical education and exercise science》2016,20(3):140-145

The purpose of this article was to examine the validity of self-reported pedometer steps/day. Forty-seven participants were provided a New Lifestyles NL-2000 (NL-2000; Lees Summit, MO, USA) pedometer and a physical activity (PA) diary for 3 weeks, but not informed of the data-storing capabilities. For weeks 2 and 3, each participant was given a step goal of 3,000 steps/day above week 1 average. A 2 × 3 repeated measures analysis of variance (ANOVA) was used to examine differences between reported steps/day. Bland–Altman plots assessed the mean bias and limits of agreement between reporting methods. Mean self-reported and NL-2000 steps/day were 9,264 ± 3,555 and 8,971 ± 3,590 steps/day (n = 26, p > .05). Mean biases were 216 ± 1,753 (week 1), –506 ± 1,355 (week 2), and –590 ± 1,360 (week 3) steps/day. Negative mean bias values indicate higher self-reported steps/day. Mean steps/day were similar between recording methods, but large differences were observed among individuals, suggesting self-reported steps/day may be valid for PA research at the population level, but not the individual level.  相似文献   

建设项目全过程跟踪审计探讨     

阎春彩  刘平 《河北工业大学成人教育学院学报》2007,22(3):55-58

建设项目全过程跟踪审计是接受业主委托,对工程项目进行全过程的跟踪审计工作。其具体内容包括在工程招标阶段协助业主起草招标文件提供咨询服务;在工程施工阶段参加图纸会审,现场勘查,隐蔽工程验收,工程变更、洽商、签证的确认,工程进度拨款的控制,以及最后对工程结算进行的审核。对工程进行全面、详细的跟踪审计工作,协助业主实现建设项目投资控制目标,以便最大的发挥业主投资效益。  相似文献   

基于视频的城市快速路交通流检测及车辆行为监控     

蔡英凤  王海  张为公 《东南大学学报》2011,(2):164-168

提出一种针对城市快速路的视频监控系统,完成交通流及道路异常行为检测.流量检测模块对车辆进行实时跟踪获得各类交通流统计数据,实现快速路车辆运行状况的全面掌控.异常监控模块运用隐马尔科夫模型,对带有时间和空间信息的车辆轨迹进行训练,获得路径划分后对道路车辆轨迹进行参数匹配,提取诸如超低(高)速行驶、违章停车、违规掉头等异常...  相似文献   

What makes a skilled writer? Working memory and audience awareness during text composition     

Denis Alamargot  Gilles Caporossi  David Chesnet  Christine Ros 《Learning and individual differences》2011,21(5):505-516

This study investigated the role of working memory capacity as a factor for individual differences in the ability to compose a text with communicative efficiency based on audience awareness. We analyzed its differential effects on the dynamics of the writing processes, as well as on the content of the finished product. Twenty-five graduate students composed a procedural text explaining how to assemble a model turbine. They were free to consult a documentary source, featuring captioned pictures of turbine parts and assembly steps, at any time. Graphomotor and eye movements were recorded using ‘Eye and Pen’ software with an eye-tracker and digitizing tablet. Results showed that high WM capacity writers used a different strategy to explore the visual source, making longer writing pauses and producing more detailed procedures, and achieved the communicative goal more efficiently, by introducing more reader supports. In conclusion, we discuss the feasibility of audience awareness training.  相似文献