并行计算在机动飞行轨迹生成中的应用

针对现有通用机动轨迹需要较长的预规划时间,无法在机载计算平台实时解算的问题,提出一种利用并 行计算的方式对通用机动框架进行加速的方法。对现有的MCTS 算法叶子节点并行、根节点并行和树并行方式进行 分析,结合叶子节点并行和根节点并行方式各自的优点,对每棵搜索树采用叶子节点并行方法,分别利用Pthread 和CUDA 对并行通用机动框架进行加速,并以筋斗机动为例对加速效果进行测试。实验结果表明：并行通用机动框 架不仅性能优于串行框架,而且可大幅缩短机动解算时间。     

一种丝网印刷间距调整系统的设计

设计了一种用于丝网印刷机的印刷间距调整系统,能够对丝网印刷间距进行实时精确调整,并在丝网印刷机中验证了该系统能够提高印刷品质,稳定工作。     

Long transition analysis for digital video sequences

Video indexing is a technique used to extract objects within a video sequence and index them so that they can be used for future retrieval. In many video sequences, special effects such as fade and wipe are incorporated, and in some cases, it is desirable to be able to include objects within such effects for indexing. In this paper, we introduce an automatic process that determines the type of transition and extracts information from it, so that this information can be used in object extraction. Such a process consists of four stages: shot boundary refinement, shot type determination, frame reconstruction for soft transitions, and shot classification for hard transitions. In this paper, we will give the implementation, timing, and performance analysis for each stage. Long transition analysis bridges the gap between shot boundary detection and object tracking and smoothes the process of automatic video indexing for video databases.     

用于光子晶体光纤研究的超格子构造法

提出应用“超格子构造法”研究光子晶体光纤(PCF)的传输特性。电场用正交完备的厄米-高斯(Hermite-Gauss)函数展开,有中心缺陷的周期性分布的介电常数用两组不同周期的介电常数分布迭加构成超格子，每组介电常数都用余弦函数展开,然后利用波动方程及厄米-高斯函数的正交性。得到光子晶体光纤的传输特性(模场分布、双折射、色散)。模式双折射的大小可用以衡量该算法的精度。     

非饱和业务下帧聚合性能分析(英文)

This paper proposes an analysis model of frame aggregation in error-free channel with unsaturated traffic and fixed aggregation size. Integrated with model of channel access, calculation of MAC (Media Access Control) average service time and queue model of frame aggregation, our model can get the stable result with a recursive algorithm, and it further derive the throughput and latency of frame aggregation in steady state. As the impact of traffic, frame length, collision probability, buffer size, aggregati...     

一种生成VLAN帧的模块的设计

VLAN(Virtual LocalArea Network)是一种通过将局域网的设备逻辑地而不是物理地划分为一个个网段,从而实现虚拟工作组的新兴技术。不同的VLAN内部的广播和单播流量都不会转发到其他VLAN中,从而有助于控制流量、减少设备投资、简化网络管理、提高网络的安全性。本文介绍了一种VLAN帧的生成模块的设计方案,其中包括VLAN插入、剥离、MAC地址的更新与还原以及重写FCS位等。通过对大量相关资料的分析,最后用Verilog-HDL语言成功地对电路进行了设计。     

最小二乘法计算晶格参数

最小二乘法是求解精确晶格参数的基本方法.讨论了使用和不使用校正函数情形下的科恩最小二乘法,给出了所有晶系的法方程、晶格参数、误差估计的计算公式,以及计算晶格参数、校正函数参数的阻尼最小二乘迭代算法,该方法具有普适性,有大的收敛范围和快的收敛速度.作为应用例子,计算了数个不同晶系晶体的晶格参数,说明最小二乘法是获得高精度晶格参数的计算方法;用阻尼最小二乘法计算了ChuG校正函数的参数,表明该方法是获得校正函数参数的有效方法.     

基于视频的车辆闯红灯检测系统设计

设计一种基于改进帧差法的车辆闯红灯检测系统。采用ARM＋FPGA的硬件平台,通过FPGA对视频图像进行实时采集,ARM进行图像处理,采用基于虚拟线圈的车辆检测方法,结合交叉路口的交通信号控制器,对违章闯红灯的车辆进行检测。在功能、安装及可维护性方面优于基于感应线圈的检测系统,在成本方面优于基于DSP的视频检测系统。     

一种简单的动态侦测算法的实现

动态侦测技术已被广泛应用于各种视频监控中,实时、有效的侦测算法成为监控系统的核心。通过对背景重建技术进行研究,利用背景差分技术,提出一种高效、易于实现的动态侦测算法。该算法利用差分结果,对像素点分类标识,并据此对背景像素点实施不同的更新。在文中给出该算法的具体实现方法,并用demo程序的截图展示了该算法的性能。结果证明,该算法在运算并不复杂的情况下,可以很好地完成对监控区域内移动目标的实时侦测。     

Content adaptive video denoising based on human visual perception

In this paper, we propose content adaptive denoising in highly corrupted videos based on human visual perception. We introduce the human visual perception in video denoising to achieve good performance. In general, smooth regions corrupted by noise are much more annoying to human observers than complex regions. Moreover, human eyes are more interested in complex regions with image details and more sensitive to luminance than chrominance. Based on the human visual perception, we perform perceptual video denoising to effectively preserve image details and remove annoying noise. To successfully remove noise and recover the image details, we extend nonlocal mean filtering to the spatiotemporal domain. With the guidance of content adaptive segmentation and motion detection, we conduct content adaptive filtering in the YUV color space to consider context in images and obtain perceptually pleasant results. Extensive experiments on various video sequences demonstrate that the proposed method reconstructs natural-looking results even in highly corrupted images and achieves good performance in terms of both visual quality and quantitative measures.