排序方式: 共有55条查询结果,搜索用时 265 毫秒
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摄像机校准和初始定位是基于机械跟踪的虚拟演播室系统的关键技术之一。分析了基于机械跟踪方式的虚拟演播室系统的结构特点和性能要求,提出了基于Tsai算法的虚拟演播室摄像机校准算法和基于主动配准的虚拟演播室摄像机初始定位算法。仿真和实际应用结果表明,算法操作简便,满足了虚拟演播室高精度定标的要求。 相似文献
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在卫星覆盖特性分析中,一般仅考虑卫星的波束主轴(及覆盖圆锥中心线)通过地心时的覆盖情况,主要研究卫星姿态发生偏转后,波束主轴偏离地心时的覆盖情况,并进行了动态覆盖仿真,模拟并分析了几种卫星及星座在姿态发生偏转时覆盖区域的变化情况。 相似文献
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基于图像的虚拟战场环境 总被引:1,自引:0,他引:1
简要总结了IBR技术的发展和现状,比较了各种模型的特点,分析了虚拟战场环境生成应包含的内容,提出了实现该环境需解决的关键技术.采用多同心圆可以构建大范围场景视点模型,分析了一种基于基础矩阵的相机参数标定方法,实现了一种基于面积和特征线的图像整合算法,对战场图像采集存储提出了初步方法.最后提出了系统实现的基本框架,为进一步研究打下了良好的基础. 相似文献
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针对路径覆盖测试,给出了一般循环结构的一种简化处理方案及把按此方案得到的控制流图转化为自由边控制流图方法,并探讨了基于自由边控制流图进行路径覆盖分析的实现方法和优点。 相似文献
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边界附近的点对程序故障更加敏感.针对这一特征,提出了一种基于程序域边界分析的测试方法.从被测程序本身出发,进行定义域确定及子域划分,分析定义域边界和子域边界,并跟据其边界测试点产生测试用例,以检测域边界附近的处理.实验表明对定义域边界及其子域边界进行测试,可有效地提高故障覆盖率. 相似文献
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This study investigates a clustered coverage orienteering problem (CCOP), which is a generalization of the classical orienteering problem. The problem is widely motivated by the emerging unmanned techniques (eg, unmanned surface vehicles and drones) applied to environmental monitoring. Specifically, the unmanned surface vehicles (USVs) are used to monitor reservoir water quality by collecting samples. In the CCOP, the water sampling sites (ie, the nodes) are grouped into clusters, and a minimum number of nodes must be visited in each cluster. With each node representing a certain coverage area of the water, the objective of the CCOP is to monitor as much as possible the total coverage area in one tour of the USV, considering that overlapping areas provide no additional information. An integer programming model is first formulated through a linearization procedure that captures the overlapping feature. A two-stage exact algorithm is proposed to obtain an optimal solution to the problem. The efficiency and effectiveness of the two-stage exact algorithm are demonstrated through experiments on randomly generated instances. The algorithm can effectively solve instances with up to 60 sampling sites. 相似文献
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针对无人机自主着陆过程中卫星导航系统易被干扰的问题,提出了一种基于地基多传感器融合的无人机自主着陆引导方法。首先采用主动式激光照射的方式,获取机载反射棱镜的近红外成像,在红外图像中对无人机目标进行识别;然后通过坐标转换将识别结果映射到可见光图像中,在可见光图像中选择的感兴趣区域进行可见光目标识别,从而在降低计算量的基础上获得更加精确的无人机相对角度信息;最后利用距离测量信息和引导系统角度信息可以获得精确的无人机相对位置。无人机着陆引导试验结果表明,该方法能够提供精确的无人机位置信息,能有效适应于复杂背景下的无人机自主着陆引导。 相似文献
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The allocation of underwater sensors for tracking, localization, and surveillance purposes is a fundamental problem in anti-submarine warfare. Inexpensive passive receivers have been heavily utilized in recent years; however, modern submarines are increasingly quiet and difficult to detect with receivers alone. Recently, the idea of deploying noncollocated sources and receivers has emerged as a promising alternative to purely passive sensor fields and to traditional sonar fields composed of collocated sources and receivers. Such a multistatic sonar network carries a number of advantages, but it also brings increased system complexity resulting from its unusual coverage patterns. In this work, we study the problem of optimally positioning active multistatic sonar sources for a point coverage application where all receivers and points of interest are fixed and stationary. Using a definite range sensor model, we formulate exact methods and approximation algorithms for this problem and compare these algorithms via computational experiments. We also examine the performance of these algorithms on a discrete approximation of a continuous area coverage problem and find that they offer a significant improvement over two types of random sensor deployment. 相似文献