浅谈绞吸式挖泥船疏浚仿真系统

介绍了疏浚仿真国内外发展现状,分析了疏浚仿真系统的系统功能、系统结构组成,并对系统开发软件工具作了详细介绍,为其它仿真系统的开发提供了很好的借签。     

Fusion of remote sensing images based on nonsubsampled contourlet transform and region segmentation

The purpose of remote sensing images fusion is to produce a fused image that contains more clear, accurate and comprehensive information than any single image. A novel fusion method is proposed in this paper based on nonsubsampled contourlet transform (NSCT) and region segmentation. Firstly, the multispectral image is transformed to intensity-hue-saturation (IHS) system. Secondly, the panchromatic image and the component intensity of the multispectral image are decomposed by NSCT. Then the NSCT coefficients of high and low frequency subbands are fused by different rules, respectively. For the high frequency subbands, the fusion rules are also unalike in the smooth and edge regions. The two regions are segregated in the panchromatic image, and the segmentation is based on particle swarm optimization. Finally, the fusion image can be obtained by performing inverse NSCT and inverse IHS transform. The experimental results are evaluated by both subjective and objective criteria. It is shown that the proposed method can obtain superior results to others.     

我国沿海主要自动化集装箱码头建设方案比较

20世纪90年代,荷兰鹿特丹港建成全球首个自动化集装箱码头;随后,英国伦敦港、日本川崎港和德国汉堡港等相继建成全自动化或半自动化集装箱码头.[1]迄今为止,自动化集装箱码头已发展至第四代,其中:第一代以1993年投入运营的荷兰鹿特丹港ECT码头为代表;第二代以2002年投入运营的德国汉堡港CTA码头为代表;第三代以2008年投入运营的荷兰鹿特丹港Euromax码头为代表;2016年投入运营的我国首个自动化集装箱码头厦门港远海自动化集装箱码头(以下简称"厦门港远海自动化码头")属于第四代自动化集装箱码头,可见我国自动化集装箱码头建设起步较晚但起点很高.     

基于点特征和边缘特征的无人机影像配准方法

为解决变形较大的无人机影像配准问题,提出了点特征和边缘特征相结合的配准方法.用尺度不变特征变换(SIFT)算法提取点特征,完成影像的初步配准,并通过多项式函数对影像进行粗校正.在此基础上提取影像的边缘特征信息,根据距离相似性对边缘特征信息进行配准;依据色彩能量差筛选点特征信息配准结果和边缘特征信息配准结果,采用小面元微分校正的方法对变形影像进行校正.实验结果表明:提出的配准方法能够弥补点特征配准方法和边缘特征配准方法的不足,其配准的鲁棒性提高10%左右,可以较好地完成变形较大的无人机影像配准.      

刍议集体企业电商化采购体系构建应用

市场形势多变,企业运营模式也要不断创新,唯有此才能在激烈的竞争中获得长足发展。在新的发展时期,企业传统的采购模式已经不在适用,企业必须构建更为先进的采购体系。本文结合实际,对集团企业电商化采购体系构建路径与应用策略进行分析论述,希望能为相关工作带来些许帮助。