基于扩展目标的不变矩跟踪算法

 提出基于边缘区域的不变矩计算方法，在此基础上，针对在运动中形状、尺寸和方位不断变化的扩展目标，提出一种以不变矩作为跟踪特征，粗、精阶段相结合的相关跟踪算法，并根据目标图像的相关性给出一种新的跟踪置信度。实验结果显示算法迅速、有效、匹配精度高，对于复杂背景，较强噪声和运动状态发生变化条件下的扩展目标跟踪稳定可靠。     

一类统一混沌系统的追踪控制与同步

对一类统一混沌系统进行控制，设计出一种含参控制器，使受控系统追踪任意给定的一维参考信号和三维参考信号，利用Lyapunov方法证明在此控制器作用下该系统按指数速率收敛到参考信号。同时研究了此受控统一混沌系统的自同步及异结构同步问题。利用Chen′s混沌系统进行数值仿真，其结果说明了此控制器设计方法的有效性。     

基于M5705的DVD-Player的数字伺服技术

研究了基于M5705芯片的DVD播放机数字伺服技术问题。给出了此数字伺服系统的基本要求与构成以及分析了M5705芯片的功能特点。并且给出了其数字伺服系统功能流程图。     

基于矢量水听器的一种时间方位历程目标跟踪方法

文章简要介绍了时间方位历程显示方式的原理，针对时间方位历程中最大值自动跟踪方法存在的弊端，提出了应用矢量水听器解决多目标跟踪问题的一种新方法，并应用于海试数据处理中，取得了良好的效果。     

水平管道中段塞流的跟踪模拟

本文对以unit cell模型为基础建立起来的段塞流跟踪模型进行了改进。利用改进后的模型对水平管道中空气-水段塞流的压降、液塞平移速度、液塞长度等特征参数进行了模拟研究,并将模型预测结果与相应的试验结果进行了比较。结果表明,改进后的模型可以有效地预测以上各参数的演变规律。模拟和试验结果均表明,水平管道中段塞流的液塞平移速度符合正态分布,液塞长度符合对数正态分布。     

一个临界系统与Lorenz系统和Chen系统的异结构同步

对最近提出的一个临界系统，设计了一个非线性控制器，使得系统的第一个状态信号以指数收敛速度追踪任意给定的参考信号；利用Active控制实现了这个临界系统与Lorenz系统以及Chen系统的异结构同步.大量数值实验验证了理论结果. 关键词： 追踪控制 异结构同步 混沌系统     

A powerful approach to real-time mobile objects tracking in crowded environments utilizing 3D video analysis of fixed camera,particle filter and neural network

A powerful approach in the area of real-time mobile objects tracking in crowded environments, utilizing 3D video frames analysis is now taken into real consideration, as a candidate to be improved. The method presented here is able to track a number of real-time mobile objects in the real complex situations in the presence of occlusion, overlapping and various shifts. This is a development of probabilistic estimation theory via particle filter. In one such case, the whole of chosen new features of mobile objects, which are unconsidered in the present probabilistic estimation, should first be analyzed through a novel neural network. Subsequently, the probabilistic estimation in each one of frames may be made in a better outcome, as long as all the mentioned components are integrated. Evaluation of the proposed approach through PETS-09 database has been finally carried out, once the results with respect to a number of standard benchmark procedures indicate that 12% accuracy improvement is acquired.     

Small moving infrared space target tracking algorithm based on probabilistic data association filter

Numerous false alarms for low signal-to-noise ratio (SNR) would seriously debase the performance for infrared low observable (LO) space target tracking. Due to the motion (i.e. azimuth, elevation and their derivative velocity), amplitude and size of infrared target are almost invariable and highly correlative, a multi-feature association approach based on probabilistic data association (PDA) is presented to track target in this paper. Firstly, the motion, amplitude and size of target are modeled as stationary random signal afforded Gaussian distribution. The probability of motion, amplitude and size of measurement originated as the target of interest is then estimated by Gaussian distribution, and that of false alarm is distributed uniformly. Subsequently, the combined probability of motion, amplitude and size is derived by PDA, and their weight coefficients are estimated adaptively according to their fluctuations. Finally, the relevant parameters including combination measurement are predicted and updated. Some experiments are included and the results show that the performance of target tracking by the proposed approach is significantly enhanced.     

玻璃带实时质量检测新方法研究

目前,浮法玻璃缺陷妨碍了它在重大技术领域中的应用,它不但影响了产品的外观,而且由于它的不平整度及屈光度的影响,使得人们透过玻璃观察实物时受到障碍。为此必须研制新的检测方法在浮法玻璃带退火窑出口处至浮法线切割之间区域进行质量检测,对不符合质量标准的玻璃缺陷在线切割。本文提出一种新的检测方法实时相移数字云纹检测方法,该方法不仅能够对气泡、结石、锡点以及其它类缺陷进行有效的分类,而且能够进一步地测出缺陷的尺寸、形状、位置及屈光度等质量参数,并且最小缺陷尺寸的检测量级能达到0.5mm。本文还开发出了一套完整的检测系统,其硬件系统包括高速线阵摄像机、荧光灯、光栅、PC机;软件系统由改进的边缘跟踪算法、求相解相算法、噪声处理及各种图像处理算法组成。     

Flow structure of microbubble-laden turbulent channel flow measured by PIV combined with the shadow image technique

The turbulence structure of a horizontal channel flow with microbubbles is experimentally investigated using combined particle image velocimetry (PIV) in order to clarify the mechanism of drag reduction caused by microbubbles. A new system which simultaneously measures the liquid phase and the dispersed bubbles is proposed, based on a combination of particle tracking velocimetry (PTV), laser-induced fluorescence (LIF) and the shadow image technique (SIT). To accurately obtain the velocity of the liquid phase, tracer particles which overlap with the bubble shadow images are almost entirely eliminated in the post-processing. Finally, the turbulence characteristics of the flow field are presented, including measurements for both phases, and the bubble effect on the turbulence is quantified.