便携式地空导弹武器系统作战效能的模糊综合评价

为科学评估便携式地空导弹的作战效能,本文对便携式地空导弹武器系统进行了全面分析,建立了便携式地空导弹武器系统作战效能综合评价的指标体系。并利用模糊数学方法,确立了该系统的综合评价模型,从而为便携式地空导弹武器系统作战效能的综合评价提供了一种方法。     

面向仿真数据的电网运行方式可视分析

对真实电网提出故障发生的假设并通过计算检验,观察故障对真实电网的影响。电网仿真能有效发现电网运行中的问题,被广泛应用于电网规划与电网运行方式调整。然而,在实际仿真计算过程中,往往需要依据经验调整电网配置和计算参数,以得到稳定、收敛的电网运行方式。大规模的仿真数据、调整的未知性加之分析的片面性会影响传统人工调整的准确性,为此提出了基于可视化的仿真计算调整方法。分析人员通过与可视分析系统的交互,可以快速认识电网的整体状态,发现问题元件,从而实现高效的仿真调整与计算。最后通过案例分析验证了本可视分析系统的有效性。     

Aerial Video Trackers Review

Target tracking technology that is based on aerial videos is widely used in many fields; however, this technology has challenges, such as image jitter, target blur, high data dimensionality, and large changes in the target scale. In this paper, the research status of aerial video tracking and the characteristics, background complexity and tracking diversity of aerial video targets are summarized. Based on the findings, the key technologies that are related to tracking are elaborated according to the target type, number of targets and applicable scene system. The tracking algorithms are classified according to the type of target, and the target tracking algorithms that are based on deep learning are classified according to the network structure. Commonly used aerial photography datasets are described, and the accuracies of commonly used target tracking methods are evaluated in an aerial photography dataset, namely, UAV123, and a long-video dataset, namely, UAV20L. Potential problems are discussed, and possible future research directions and corresponding development trends in this field are analyzed and summarized.     

转换屏发光光谱对闪光照相成像质量影响研究

转换屏的X射线激发发光光谱与透镜系统的匹配偏差会对闪光照相光电接收系统的成像质量造成影响.提出了一种一维线阵全分辨的模拟计算方法,对在理想光源照射下系统成像视觉全分辨能力进行了模拟计算.用白光光源加滤波片照明分辨率板的实验方法,对不同光源照射下系统的成像质量进行了评估.分析表明,转换屏发光宽光谱及其中心波长与透镜系统不匹配均对成像分辨率造成一定影响,而对图像对比度造成较大影响.只有在透镜系统针对的消像差波段540～550 nm附近窄带发光的转换屏,其成像质量才能基本不受匹配影响,近似于模拟计算的结果.     

The Influence of Visual and Spatial Reasoning in Interpreting Simulated 3D Worlds

This paper explores the way in which young children (6 year olds) made sense of screen-based images on the computer. The participants were required to interpret 3D-like representations and relate these images to objects in their environment. Both static and relatively dynamic software programs were used in the investigation. Some of the children could not make links between the screen representation and the intended three-dimensional (3D) objects. It is argued that young children should be exposed to activities that establish explicit links between 2D and 3D objects ``away' from the computer before attempting the more difficult links required to interpret and represent 3D objects in ICT contexts. This revised version was published online in July 2006 with corrections to the Cover Date.     

一种基于视觉注意模型的可移动目标检测方法

提出了一种基于视觉显著性的目标检测算法,用于对位于地面上的车辆、飞 机等地面可移动目标进行检测和定位。针对地面可移动目标在场景中较小的特点,设计了一种用于对 目标检测进行引导的基于视觉注意机制的目标显著模型。首先,提取图像目标的颜色特征、强 度特征和方向Gabor特征,并将其结合起来用于计算显著图。然后以超像素为单位对 显著值进行计算,并结合人眼视觉敏感度对不同距离的超像素之间的差异进行加权处理。实 验结果表明,本文算法可以有效地检测并定位出复杂背景中的地面可移动目标。     

梯度表面能材料上液滴运动特性实验

对水平和30°倾角放置梯度表面能材料表面上液滴运动特性进行了可视化实验,分析了液滴在梯度表面上运动速度的变化规律,以及液滴大小和表面倾角对运动速度变化的影响.实验结果表明:在梯度表面能材料上,液滴能获得较大的宏观运动速度,并可以沿30°倾角放置的梯度表面材料上自下而上的运动;大液滴较小液滴的峰值运动速度大,运动距离更远;液滴在运动过程中出现蠕动的现象.     

可见区分光光度法测量水体色度

针对目前水质色度测量方法的局限性,采用分光光度法测量相关色度学参数,通过色度学参数与国家标准方法的色度值建立数值关系,从而测定水体的色度值.该方法不仅保证测量结果与现行国家标准测量结果一致,而且客观性强,稳定可靠,灵敏度更高,也更准确.克服了目视比色法需要水体与标准溶液色调一致的局限性,可以推广到其他色调的废水色度测量...     

基于后验概率度量的粒子滤波跟踪算法研究

 针对遮挡、光照变化、尺度变化等复杂环境中的视觉跟踪问题,提出一种基于后验概率度量的粒子滤波跟踪算法。由于后验概率指标与Bhattacharyya系数指标相比具有更强的峰值特性,采用后验概率指标作为相似性度量函数,通过粒子的更新、推广、观测、估计等步骤实现跟踪算法。通过对实际视频图像序列进行目标跟踪实验,实验结果表明:传统算法只有约50%的图像能够实现尺度自适应,而本文算法采用传统算法25%的粒子就能够收敛逼近目标的真实轨迹,达到更强的抗遮挡能力,90%以上的图像序列都能够实现良好的尺度自适应效果。