共查询到19条相似文献,搜索用时 156 毫秒
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大多数传统的跟踪门技术仅使用目标的运动学量测信息,在多目标、多杂波跟踪场景中会导致较大的关联不确定性。考虑到属性传感器可以获取目标的类型信息,提出了基于目标联合状态类型概率密度的跟踪门方法。首先给出目标状态与类型的联合概率密度表示,从而导出以类为条件的跟踪门构建方法。为了适用于实时的非线性跟踪系统,门限的计算采用了基于仿真的算法。场景 1显示如果目标的量测预测密度为偏斜函数时,基于仿真的门限算法可以获得最优的跟踪门;场景 2为地面编队目标的跟踪过程。与使用传统的跟踪门相比,以类为条件的跟踪门技术在很大程度上提高了目标量测到航迹的关联率。 相似文献
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运动目标空间位置激光跟踪测量是计量测试领域的前沿课题,该测量系统集激光干涉测距、光电检测、精密机械、计算机及控制系统和现代数值计算于一体,对空间运动目标进行跟踪并实时测量其坐标和姿态。测量范围1-10m,测量精度50μm/m。采用多个激光干涉仪进行冗余设计,对测点造成过定位,通过解最小二乘方程组计算出被测点的坐标。文中论述了多站法跟踪测量的原理并建立了计算坐标的数学理论模型。 相似文献
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光电跟踪测量系统的测量精度与成像质量受成像系统动态分辨率的影响.成像系统动态分辨率受光电跟踪测量系统跟踪精度的影响.分析与试验表明,光电跟踪测量系统的动态成像分辨率主要取决于静态分辨率和跟踪精度;工作过程中的光电跟踪测量系统的动态成像分辨率比光电跟踪测量系统的静态成像分辨率低;与传感器的积分时间相比,高频目标与低频目标对动态成像分辨率的影响模型不同;在传感器积分时间、目标的运动状态及对动态分辨率要求确定的条件下,可对静态成像分辨与控制系统进行优化设计. 相似文献
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提高光电经纬仪跟踪快速运动目标能力的一种方法 总被引:12,自引:2,他引:10
考虑到系统稳定性,光电经纬仪跟踪伺服系统一般设计成Ⅰ型系统。Ⅰ型系统存在速度、加速度动态滞后误差。动态滞后误差的大小不但与跟踪系统有关,还与目标运动特性有关。在跟踪快速运动目标时,会因速度、加速度动态误差的增大,导致目标脱离视场,丢失目标。因此提高光电经纬仪跟踪快速运动目标的能力,一直是光电跟踪伺服系统努力的方向。本文给出了一种提高光电经纬仪跟踪快速运动目标的能力的方法:动态1 Ⅰ控制法,并利用SIMULINK建立了跟踪伺服系统动态1 Ⅰ控制法仿真模型。仿真结果表明动态1 Ⅰ控制法是一种提高光电经纬仪踊跃快速运动目标能力的有效方法。 相似文献
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机载光电跟踪系统连续帧图像快速识别定位 总被引:3,自引:0,他引:3
针对机载光电跟踪系统连续帧图像快速识别、准确定位的要求,本文在深入分析连续图像序列特性和机载光电跟踪系统特点的基础上,结合精密转台的运动变化信息,提出了基于转角信息的连续帧图像处理算法.该方法根据精密转台的转角变化信息,采用连续的图像序列进行多帧间差值运算以获得目标残差图,残差图之间相乘.除去大部分随机噪声点,结合中值滤波和自适应渡门跟踪算法,大大的减小了运算量,实现了运动目标的快速跟踪定位.通过对目标实测图像序列的试验,结果表明,该算法具有快速、稳定等优点,能满足机载光电跟踪系统实时图像跟踪的要求. 相似文献
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Bashford G.R. von Ramm O.T. 《IEEE transactions on ultrasonics, ferroelectrics, and frequency control》1996,43(3):376-384
This article describes a new angle-independent method suitable for three-dimensional (3-D) blood flow velocity measurement that tracks features of the ultrasonic speckle produced by a pulse echo system. In this method, a feature is identified and followed over time to detect motion. Other blood flow velocity measurement methods typically estimate velocity using one- (1-D) or two-dimensional (2-D) spatial and time information. Speckle decorrelation due to motion in the elevation dimension may hinder this estimate of the true 3-D blood flow velocity vector. Feature tracking is a 3-D method with the ability to measure the true blood velocity vector rather than a projection onto a line or plane. Off-line experiments using a tissue phantom and a real-time volumetric ultrasound imaging system have shown that the local maximum detected value of the speckle signal may be identified and tracked for measuring velocities typical of human blood flow. The limitations of feature tracking, including the uncertainty of the peak location and the duration of the local maxima are discussed. An analysis of the expected error using this method is given 相似文献
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改进的EKF算法在目标跟踪中的运用 总被引:5,自引:3,他引:2
过程噪声和测量噪声影响Kalman滤波的性能,通常很难得到它们准确的值。提出观测噪声和过程噪声实时估计的自适应算法。该算法可以用在非线性和机动目标跟踪问题中,不必预先知道准确的噪声方差。重新估测观测噪声方差矩阵,可以较好地消除由观测噪声带来的误差;建立一个简单的线性Kalman滤波器对过程噪声进行实时估计,这对于机动目标来说是必要的,因为原有的过程噪声将受到加速度影响,不能包含全部的信息。实验表明,该算法保证EKF稳定性,提高了跟踪性能。模拟实验300次后,X,Y方向位置均方误差分别为7.8099,9.6838。 相似文献
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Owing to the importance of video surveillance in the public area, tracking finds significant applications using computer vision algorithms to observe the activity of human. In tracking, multi-object tracking is an active research to analyse and detect the activity of anomalies in the crowded scenes. Accordingly, different multi-object tracking algorithms are proposed in the literature to track the human behaviour of the crowded scenes. In this paper, we have presented a zero-stopping criteria-based hybrid tracking algorithm for high-dense crowd videos. Here, head objects are detected using the proposed objective function which considers both colour and texture property of videos. Then, tracking based on motion is performed using the proposed HSIM measure which includes structural similarity (SSIM) and the proposed similarity function. Along with, the data prediction model, exponential weighted moving average (EWMA), is also utilised to track the spatial location of human objects. These two tracking models are then hybridised to obtain the final tracked output. The experimentation is performed with three marathon sequences and the performance is evaluated with particle filtering-based algorithm using tracking number, tracking distance and optimal subpattern assignment metric (OSPA). 相似文献
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There is a real need to develop a sensory system that can monitor and track the behavioral status of a person in real time while protecting his/her privacy. In addition, it is important to have the ability to detect stationary and moving objects in real time to support dynamic navigation needs for mobile robots. This paper describes the development of intelligent fiber-grating (FG)-based 3-D vision sensory system that enables real-time object detection, monitoring, and tracking. This system uses the richness and the strength of the vision while reducing the data load and computational cost by encoding the working space using a limited number of spatially interrelated 2-D laser spots. The sensor system generates the laser spots by projecting a coherent laser beam on two perpendicularly overlaid layers of FGs. The presence of a target within the visible operational view of the sensor disturbs the part of the projected laser spots' pattern where the target appeared. By calculating the displacement of the disturbed spots within the CCD image plane, the sensor system can detect, in a short time, an object/human and provide relevant information in terms of range, approximate shape, and position. To facilitate faster detection and real-time tracking, the author has developed two strategies that decompose the working space into zones and virtual planes 相似文献