Brown运动的强马氏性及应用

随机过程{xt,t∈R }称为马尔可夫过程,如果已知过程的"过去"和"现在",则过程"将来"的条件概率可依赖于"现在",所谓强马氏性即把可选时τ作为"现在",过程仍具有马氏性,本文讨论证明Brown运动也具有强马性及Brown运动在一些方面的应用.     

视频监控系统中运动检测的研究

运动检测技术在现代的视频监控系统中起着重要的作用。本文分析了相关的技术背景和用户需求,得出了运动检测应该达到的基本目标。基于此分析,设计了一个完整的运动检测系统并给出了部分实现。系统采用MPEG4编解码技术和DirectDraw显示技术,完成显示更新和报警联动功能,可以达到监控系统中运动检测的需要。     

匀速直线运动模糊图像恢复算法研究

通过建立点扩散函数（PSF）．将基于频域变换图的Radon变换和微分自相关方法相结合估计出PSF的两个必要参数,再用Lucy—Richardson滤波进行运动模糊图像恢复。对实际处理中会遇到的频域图中心十字亮纹的问题提出了改进。该方法对模拟的运动模糊图像和真实的模糊图像恢复效果比较稳定。颇具实用价值。     

室内暴力智能监控系统设计

介绍了一种基于视频的室内暴力监控系统。主要通过图像敏感色检测、图像帧序列的运动检测两个方面进行暴力事件监控识别,再利用计算机对监控信息进行分析处理,把计算机分析的结果传送到监控者手中。     

帆船的运动模式及起航探究

帆船运动是一项非常具有挑战性和观赏性的水上运动项目,在20世纪初正式被列入奥运会比赛项目,帆船运动对于锻炼人的意志,增强人的体质方面得到了充分的认可。纵观我国现阶段的帆船运动发展情况,无论是在人们认知的范围上,还是在帆船运动的比赛技巧上,都还没有形成完整的体系。本文首先分析了帆船的结构和各部分的功能,其次解释了帆船的运动原理,最后对起航的流程和注意事项提出了几点建议,期望对读者提供一定的借鉴作用。     

基于UG NX在机用虎钳运动仿真中的应用

NX是一种最普及、最优秀的CAD/CAM/CAE软件。笔者结合近几年的教学及工作经验,借助NX软件强大的实体建模功能进行建模,并利用装配功能完成了虚拟模型的创建,然后进行了详细的运动仿真分析。本文简单介绍NX软件的装配模块以及UGNX运动仿真应用于机械结构设计。     

我国优秀运动员运动技能特点的分析

运动技能学在我国尚未形成独立的学科,多数学者对其研究局限于体育的教学与训练范畴,而对于高水平运动员运动技能的研究相对很少。因此,此研究利用文献资料法、访谈法等,研究我国优秀运动员运动技能特点,从整体上认识与把握其内在的本质特征及相互关系,为我国运动技能学科的形成提供理论依据。     

Estimating physical activity in youth using an ankle accelerometer

This study developed and validated a vector magnitude (VM) two-regression model (2RM) for use with an ankle-worn ActiGraph accelerometer. For model development, 181 youth (mean ± SD; age, 12.0 ± 1.5 yr) completed 30 min of supine rest and 2–7 structured activities. For cross-validation, 42 youth (age, 12.6 ± 0.8 yr) completed approximately 2 hr of unstructured physical activity (PA). PA data were collected using an ActiGraph accelerometer, (non-dominant ankle) and the VM was expressed as counts/5-s. Measured energy expenditure (Cosmed K4b²) was converted to youth METs (MET_y; activity VO₂ divided by resting VO₂). A coefficient of variation (CV) was calculated for each activity to distinguish continuous walking/running from intermittent activity. The ankle VM sedentary behavior threshold was ≤10 counts/5-s, and a CV≤15 counts/5-s was used to identify walking/running. The ankle VM2RM was within 0.42 MET_y of measured MET_y during the unstructured PA (P > 0.05). The ankle VM2RM was within 5.7 min of measured time spent in sedentary, LPA, MPA, and VPA (P > 0.05). Compared to the K4b², the ankle VM2RM provided similar estimates to measured values during unstructured play and provides a feasible wear location for future studies.     

基于惯性测量单元的人体运动测量系统设计

本文对运动测量系统所涉及的坐标定义、姿态算法等进行研究,提出了一种新型人体运动测量方法,本人体运动测量系统主要应用微惯性测量单元(Micro Inertial Measurement Unit,MIMU),按照姿态检测的要求,选取了微机电系统(Micro Electro Mechanical Systems,MEMS)传感器来采集数据,其中包括一个三轴陀螺仪、一个三轴加速度计和一个三轴磁阻传感器;并利用STM32单片机作为主控制单元来实现数据处理,通过串口通信实现上位机数据传输;用C语言编写上位机系统软件,检测识别人体动作。     

High throughput bandwidth optimized VLSI design for motion compensation in AVS HDTV decoder

In this paper we present a motion compensation （MC） design for the newest Audio Video coding Standard （AVS） of China. Because of compression-efficient techniques of variable block size （VBS） and sub-pixel interpolation, intensive pixel calculation and huge memory access are required. We propose a parallel serial filtering mixed luma interpolation data flow and a three-stage multiplication free chroma interpolation scheme. Compared to the conventional designs, the integrated architecture supports about 2.7 times filtering throughput. The proposed MC design utilizes Vertical Z processing order for reference data re-use and saves up to 30% memory bandwidth. The whole design requires 44.3k gates when synthesized at 108 MHz clock frequency using 0.18-μm CMOS technology and can support up to 1920×1088@30 fps AVS HDTV video decoding.