矢量型电子河道图岸线提取方法研究

为快速准确获取河道岸形线的数据,生成缺乏岸线数据资料的河道矢量型轮廓图,提出一种通过处理雷达图像获取矢量型电子河道图岸形线数据的方法。采用了数学形态学方法实施对雷达图像处理,主要的处理过程包括:雷达图像灰度处理,灰度雷达图像转变为二值图像,二值雷达图像的滤波处理,在以上处理过程的基础上构造了数学形态学结构元素,实施对河道岸线提取,并矢量化处理了离散点。在二值化过程中提出新的方法,针对雷达图像的特点,依据航路规则设计了特殊的滤波过程,提出了提取河道任意边缘的方法。     

基于智能视觉的船体焊接坏点识别

船体焊接坏点识别对保证舰船制造工艺精度具有重要的价值,也是提高舰船建造质量的关键技术。针对当前船体焊接坏点识别精度低的问题,设计基于智能视觉的船体焊接坏点识别方法。首先对船体焊接坏点识别的视觉图像进行采集,并对图像进行增强处理,提高图像的清晰度,然后提取船体焊接坏点的图像特征,采用人工智能技术对船体焊接坏点进行分类和识别。实验结果表明,本文方法可以提高船体焊接坏点识别精度,应用于实际舰船制造工艺中,能够保障舰船建造质量。     

基于信息熵的图像阈值选取算法

阈值法是图像分割的一种重要方法,在图像处理与目标识别中广为应用.信息熵可以表征图像的灰度信息,并用以区分图像中的目标和背景.文中研究了最大熵法的分割效果、对数熵的运算时间,然后使用指数熵代替对数熵,并对二维最大熵法进行了改进,在结合大津法的同时,加入了4邻域外像素灰度的信息.实验结果表明本文所用方法可有效缩短计算时间、突出边缘特征、提高阈值自动选择的准确性和鲁棒性.     

基于图像处理和机器学习的船舶焊接缺陷识别技术

焊接技术在当代船舶建造过程中发挥着重要作用,焊接产品的质量直接关系到船舶安全,为保证焊接质量的可靠性和稳定性,国内外学者对焊接缺陷的提取和识别方法进行了大量研究。本文提出基于深度信息提取焊接缺陷的方法,以及基于SVM的在焊接分类识别方法。实验表明,这种基于图像处理和机器学习的焊接缺陷识别方法可以获得较好的鲁棒性和较高的识别率。     

基于FPGA的高速图像处理技术

随着现代科学技术的发展,图像处理技术取得了巨大进步,在舰船等交通领域得到广泛应用。由于舰船航行条件一般都比较复杂,拍摄出的图像不够清晰,所以需要利用图像处理技术对图像进行处理。本文针对目前舰船图像处理存在的问题,研究基于FPGA图像处理的算法,在现有冒泡算法和一般快速排序算法的基础上,提出一种适用于舰船图像处理的基于横向拓展的新快速滤波算法,并通过QUARTUS9软件和Matlab仿真实验验证。结果表明,新算法在执行速度和图像处理效果上都优于前2种算法,有效提高了FPGA处理图像数据的速度,可以方便地应用于舰船图像处理。     

图像处理技术在航海导航系统中的应用

常规的图像处理技术生成的水下地形图存在对比度误差,导致选择的航行线路不是最优,因此研究新式图像处理技术在航海导航系统中的应用。该技术通过灰度阈值法去除图像背景,实现对图像的二值化处理。识别单连通区域,利用边缘检测算子计算偏差,根据得出目标物的边界值,分割二值图像。提取分割图像中水面上与水面下的地形特征,设置该海域图像的对比度,以此反映此处地形的起伏状态,实现图像处理技术在航海导航系统中的应用。实验结果表明,与常规图像处理技术相比,本文导航系统生成的图像对比度更高,反映出的海域地形更加精准。应用这一技术,航海导航系统生成的路径最优。     

一种基于模糊聚类的火焰色彩特征目标检测

计算机视觉检测是指利用计算机图像处理系统来模拟人类视觉进行检测对象的分类、识别和测量的技术.使用基于模糊聚类的图像RGB分量线性变换后的正交彩色特征,建立了应用于火焰检测的一种混合检测模型,并将其应用于视频序列图像中火焰的自动检测.实验结果验证了该方法的有效性.     

多特征融合的新型火灾图像探测方法研究

针对常用的单特征判据的火灾图像探测技术在复杂场景中难以有效地去除干扰,容易出现误报漏报情况,在对火焰图像的颜色特征和形态学特征的研究基础上,结合计算机图形学、数字图像处理等技术,提取火焰的面积变化,颜色特性,以及尖角特征等多种参数,拓展一种多特征融合的火灾图像探测方法.通过采用七组视频录像对此探测方法进行验证,实验结果表明,该方法能较好地排除干扰信息,探测率高,可靠性好.     

基于DM64X的红外图像采集系统设计

设计了一种红外图像采集系统,以TI公司DM643为核心器件,选用了MAX9526等新型视频处理芯片,完成了对图像的采集处理传输几部分主要功能。实验表明该系统可以实时实现各种图像处理算法,并进行实时数据传输及完成与其他系统通信的功能,该系统可以作为图像传感器广泛应用到各网络图像获取的系统中。     

基于舰船红外图像的耦合Sine混沌映射加密方法

为了保证船舶在航行过程中对图像的准确识别,提高信息处理的安全性,结合颜色图像分量原理,设计一种舰船红外图像耦合Sine混沌映射加密方法。通过识别和采集舰船红外图像进,并针对不同三维混沌映射加密处理,优化混沌映射加密步骤,保证图像处理效果。最后通过实验证实,舰船红外图像的耦合Sine混沌映射加密方法具有较高的加密安全性。     

Errata

正In the paper"Influence of Fouling Assemblage on the Corrosion Behaviour of Mild Steel in the Coastal Waters of The Gulf of Mannar,India"in Vol.12,No.4,Page:509,References were lost,and the two authors’biographies were identical.The correct text is shown below.We apologize to the authors and our readers for any inconvenience caused by the errors.     

Journal of Marine Science and Application 2014 Sum. Contents

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第34届海洋、离岸及极地工程国际会议(英文)

正St.John's,Newfoundland,Canada,May 31-June 5,2015 OMAE2015 is the ideal forum for researchers,engineers,managers,technicians and students from the scientific and industrial communities from around the world to: meet and present advances in technology and its scientific support;     

联合作战计划和执行系统

全球指挥控制系统(GCCS)实施当前美国海军网络中心战信息基础设施的联合计划网络。联合作战计划和执行系统(JOPES)支持GCCS实现联合计划。JOPES有两类计划：时间不限的精密预案计划生成作战计划、方案计划或职能计划；时间敏感的危机行动计划生成作战命令或战役方案。前者在和平时期创建的作战计划是后者的计划基础，加速应付危机的能力。     

Eastbound or westbound ?

In terms of equal sailing distances, where is the inflexion when ships depart from ports in the Asian Continent to New York via Suez and/or Panama？
The answer is China South Port Group （Hong Kong, Shenzhen and Guangzhou）.     

Recent progress on wave induced loading measurements in warships

Recent measurements of wave induced hull strain and flexure in RN warships are presented together with the derivation of the current design criteria for extreme hull girder bending loads. The history of the development of the shipboard instrumentation used is given and recent developments to improve the quality and ease of analysis of the data are described. An unexpectedly high transverse asymmetry in the longitudinal strains measured in destroyers is shown to be the result of a combination of vertical and lateral bending in oblique seas. Finally recent theoretical comparisons between the loading of Deep-Vee hulls and conventional UK rounded bilge hulls are presented which demonstrate the higher loading experienced by this type of hull form.     

桥梁防撞设施物理模型试验

物理模型试验是预报防撞设施所受撞击力及优化设计方案的主要方法之一。结合杭州湾大桥柔性防撞设施及东海大桥独立式防撞体设计方案,阐述了船—防撞体撞击试验的基本原理、方法、试验方案及相关试验结果。提出了柔性防撞系统的优化方案。试验结果表明,该方案经济有效,可供预报类似桥梁防撞设施撞击力时参考。     

印尼某电厂码头水工建筑物设计

印尼某电厂项目码头水工建筑物包括码头、防波堤和护岸等主要组成部分。在该项目水工建筑物的设计过程中,综合考虑当地的自然条件、施工能力和材料来源等因素,不断优化结构选型和结构断面。根据不同使用要求,护岸分别采用直立式和斜坡式2种结构型式,推荐的设计方案节省投资、施工方便,可供同类工程设计参考。     

Impact of regulation on the performances of long-distance transport services: A comparison of the different approaches in Sweden and Norway

Despite the many socio-economic similarities between Sweden and Norway, differences in jurisdiction, organisation, cooperation, and financing of long-distance passenger train and coach services have led to the development of four distinctively different ways of serving the markets. This paper describes how the train and coach markets have developed in the two countries, with emphasis on regulatory and industrial structure and a couple of performance variables.Looking at passenger rail, both countries separated infrastructure from operation over a decade ago. However, while Norwegian rail is characterised by an almost monopoly supplier, rail services in Sweden are partly decentralised to the responsibility of county authorities and are widely subjected to competitive tendering. The rest of the network is about to be opened up for on-the-track competition. Swedish Rail (SJ) has spent the last decades consolidating its core business (passenger rail) and sold out its other businesses. In contrast, the Norwegian state rail (NSB) has expanded its business to become a major bus operator and property owner, with extensions also into the Swedish market.The coach industry was more recently deregulated in both countries. The Swedish coach market is dominated by privately owned companies operating services to and from Stockholm. In Norway, state-owned NSB is a major coach operator on medium distance routes, and is also the largest partner of Nor-Way Bussekspress which totally dominates long-distance coach services. Further, the Norwegian coach market is characterised by cross-ownership and cooperation which has enabled an extensive route network which covers most of Norway.We find distinct differences in achievements in the two modes and in the two countries. Swedish rail services have succeeded in winning market shares and in renewing and developing both infrastructure and service levels to a greater extent than the Norwegian model. On the other hand, the Norwegian coach market seems to be more developed and efficient compared to its Swedish counterpart.The paper concludes with a discussion on the possible links between the different approaches and the performance observed, with the aim to stimulate further and more detailed research on some important issues.     

开放式数据挖掘系统模型

目前国内已经出现了少量的数据挖掘相关产品。国内数据挖掘软件无论从数量还是质量上比较，都与国外软件存在着较大的差距。随着数据仓库技术的普及，数据挖掘应用的需求越来越强烈，如何缩短这种差距，研发数据挖掘软件产品成为国内业界的一个重要问题。通过引用目前国际通用数据挖掘标准技术来构建开放式的数据挖掘系统模型，该系统模型从可扩展性、可重用性、易用性等方面得到了加强。