基于QuickBird遥感影像的城市道路信息提取方法研究

从光谱提取和特征提取两个重要方面总结了目前城市道路信息提取的基本方法,讨论了这些方法的优缺点。根据昆明市QuickBird遥感影像的特点以及城市道路的特点,提出基于Sobel边缘检测算法提取城市道路的流程以及处理方法,对城市道路信息提取的方法进行研究和探索。     

改进Hough变换在直线铁轨图像边缘检测研究

针对铁路轨道数字图像处理中直线铁轨检测的快速有效问题,提出一种改进Hough变换直线铁轨检测方法.首先对图像进行小波提升,用经典的边缘检测LoG算子进行图像的边缘检测;然后计算图像空间直线斜率重叠度来快速检测出直线;最后将图像转换到参数空间,计算局部极大值点,检测出直线.通过大量的仿真实验证明了该方法对直线铁轨检测的有效性和实用性.     

基于灰度门限分析的海天线检测研究

由于海天线检测在海天背景下的舰船目标检测与跟踪方面具有重要作用,提出了一种基于边缘灰度梯度门限分析和最小二乘直线拟合法的海天线检测方法。通过分析图像以及调整线性滤波器的步长来扩大海天线附近的灰度梯度差。采用门限分析法提取了边缘坐标,采用最小二乘直线拟合法提取了海天线,并利用MATLAB软件进行仿真验证。结果表明,本文算法可准确提取复杂背景下的海天线,且具有较好的适应性与实用性。     

实时图像边缘检测的设计及FPGA实现

传统Sobel算法实现边缘检测是基于静态图像,而在实时图像处理中,边缘检测存在一定的复杂度和难度,文中将FPGA应用于实时图像边缘检测系统,从而实现动态实时图像的边缘检测。通过搭建实验平台仿真验证表明,检测精度和数据处理的运算效率均有所提高。     

Proactive content caching by exploiting transfer learning for mobile edge computing

To address the vast multimedia traffic volume and requirements of user quality of experience in the next‐generation mobile communication system (5G), it is imperative to develop efficient content caching strategy at mobile network edges, which is deemed as a key technique for 5G. Recent advances in edge/cloud computing and machine learning facilitate efficient content caching for 5G, where mobile edge computing can be exploited to reduce service latency by equipping computation and storage capacity at the edge network. In this paper, we propose a proactive caching mechanism named learning‐based cooperative caching (LECC) strategy based on mobile edge computing architecture to reduce transmission cost while improving user quality of experience for future mobile networks. In LECC, we exploit a transfer learning‐based approach for estimating content popularity and then formulate the proactive caching optimization model. As the optimization problem is NP‐hard, we resort to a greedy algorithm for solving the cache content placement problem. Performance evaluation reveals that LECC can apparently improve content cache hit rate and decrease content delivery latency and transmission cost in comparison with known existing caching strategies.     

一种基于差异化服务的MEC应用实例智能迁移机制

基于ETSI提出的MEC系统移动用户应用实例智能迁移机制,提出了一种增强的基于差异化服务的应用实例智能迁移机制。根据需要迁移的用户数量和业务数量定义了 4 种状态消息同步模式,使得运营商可以对具有不同服务性能优先级请求的用户和业务的处理具有更大的灵活性,为实现差异化服务和计费提供了更多的选择。     

基于改进区域生长的红外与可见光图像融合方法

针对红外图像和可见光图像的成像特点, 提出了一种红外与可见光图像融合方法。首先, 采用改进的区域生长法, 提取红外图像目标区域。将提取到的红外目标区域映射到可见光图像中, 进行一次局部信息融合。然后, 将第一步的融合结果与原始红外图像通过一种边缘增强的小波变换融合法得到最终的融合图像。实验结果表明, 该方法得到的融合图像红外热目标突出、背景清晰, 具有良好的目视效果。     

Overview： Electromagnetic Scattering from Ocean Surface

Understanding the sea surface scattering process is very important in the development of models to detect the target above or under the surface. In this paper, both the analytical and the numerical methods applied in sea surface scattering are summarized. Some important problems concerned in this field are discussed. For numerical study, edge effect brings artificial nonrealistic scattering and therefore must be suppressed. Different edge treatment methods are compared in this paper. Scattering of breaking wave surface at very low grazing angle always needs more attentions than other scattering problems. Some numerical results show the existence of the special phenomena at very low grazing angle, for example, the ＂sea spikes＂ and the Doppler splitting.     

基于快速8-连通域标记的视频字幕提取新算法

提出了一种基于彩色Roberts边缘算子、形态学和快速8-连通区域标记的视频字幕提取新方法.首先用彩色边缘算子提取出字幕的边缘信息,再通过形态学处理得到字幕连通区域,最后采用快速8-连通区域标记新方法进行连通区域分析得到最终字幕区域.实验证明,该算法能够快速定位字幕区域,定位精度较高,具有较好的稳健性.