最小噪声分离变换与Haar小波变换结合的壁画线状特征增强方法

在壁画的保护与修复中,线状特征具有重要的意义。然而由于自然环境等因素的影响,壁画经常出现褪色残缺等病害,导致其线状特征难以辨认。因此,利用高光谱成像与Haar小波变换结合,提出了一种壁画线状特征增强方法。首先,对高光谱影像进行最小噪声分离(MNF)变换,选取前10波段进行MNF逆变换进行重构,实现高光谱影像的降噪处理。其次,对重构后的影像选择真彩色波段变换为灰度图像,对灰度图像进行Haar小波分解。然后,对最小噪声分离变换后的影像,利用最大平均梯度法进行最优波段选择,将最优波段利用Haar小波进行变换,利用其分解后的低频信号与灰度图像分解后的低频信号相融合,高频信号使用MNF逆变换重构后的灰度图像。最后,对优化组合的低频和高频信号进行Haar小波逆变换得到结果图像,达到增强线状特征的目的。经过与原始灰度影像、主成分分析线状特征增强方法对比,验证了线状特征增强方法的有效性。研究结果可为壁画的保护修复提供更丰富、更直观的参考信息。     

关于田野考古绘图的一点思考

本文试图在科学、规范的要求下,重新界定田野考古绘图中探方分层平面图的涵义及其命名方式,强调对于地层分布线记录的重视,探讨了探方分层平面图绘制的一般性原则。对考古绘图的发展前景,及其在未来的考古学研究中的作用作了一点思考。     

西安地区出土玉器述要

西安地区早在新石器时代仰韶文化时期就已出现玉器,汉唐时期这里还成为全国的主要玉器加工和贸易中心.西安地区秦以前玉器在造型和纹饰上有着明显的"秦式"特征,地域风格鲜明.秦汉隋唐时期各地玉器风格趋同.五代以后,当地制玉业衰落,现在西安地区所能见到的此期玉器,出土的很少,传世的相对较多,且多为东部地区加工制作的.     

试论休闲时代发展阶段及特点

本文通过对休闲时代概念的界定,划分了休闲时代的发展阶段,着重阐述了休闲时代的多元特征。在此基础上,分析了我国体闲时代的发展现状,并借鉴国际经验,提出了我国休闲时代发展的建议和对策。     

工业旅游产品个性特征的认知

摘要：本文通过归纳分析总结了工业旅游产品所具有的以工业为主题、科普性强、工业生产与旅游生产同步等个性特征,为加深人们对工业旅游产品个性特征的认识提供思路、案例。     

基于机器学习技术的旅游方式偏好研究——以南京市为例

从人口特征和个人价值两方面探讨引起旅游方式偏好差异的关键因素。首次采用新型机器学习算法C4.5-RulePANE对以南京市民为样本的调查数据进行分析建模,从中获取反映偏好团队游或自助游的典型人群特征的预测规则。研究表明:(1)在人口特征变量中,收入、家庭生命周期、学历对旅游方式偏好起到重要的影响作用;(2)个人价值变量对旅游方式偏好亦起到重要的影响作用;(3)利用机器学习技术建立多维因素到目标概念的非线性映射模型,比仅对一维因素分析更准确、全面;(4)通过建模能够获取反映人们旅游方式偏好的预测规则,该规则从多个角度对偏好团队游或自助游的典型人群特征进行描述。     

休闲产业初探

休闲产业作为一种新的服务产业业态，对全球经济的健康发展起到了相当大的推进作用，已经在国内外引起广泛的关注。休闲产业的发展，对拉动我国内需市场、促进产业经济结构的调整，将产生现实和深远的影响。     

River landscapes: The origin and development of the printed river map in the Netherlands, 1725–1795

Abstract

River management in the province of Holland in the eighteenth century was co‐ordinated by a Hydraulic Department which worked closely with local, regional and other provincial authorities to maintain river beds and channels. To perform its function efficiently, all the Hydraulic Department's main river maps followed general precepts laid down as early as 1725 by the surveyor Nicolaas Cruquius (1678–1754). The basic principle was to create clear maps with uniform scale and design which contained only the topographical information relevant to the work of the department. Experiments with depth contours were made, and profiles and diagrams were included in order to portray as accurately as possible the invisible natural processes which influenced the river landscape. The cartographical model thus established was followed consistently throughout the eighteenth century.     

Autobiographische Darstellung des Lebensganges und des wissenschaftlichen Lebenswerkes 1

ABSTRACT

Few maps mirror the history of the twentieth century as closely as the International Map of the World (IMW). A proposal for a map of the entire globe on a scale of 1:1 million, using standard conventional signs, was presented at the Fifth International Geographical Congress in Berne in 1891 by the German geographer Albrecht Penck. More than two decades later, the final specification was finally published shortly before the outbreak of the First World War, a crisis that brought a halt to the international collaboration on which the project depended. The IMW’s fortunes waxed and waned over the next three decades, necessitating a major review of its continuing value after the Second World War. A new IMW Executive Commission under the chairmanship of John Kirtland Wright, Director of the American Geographical Society, was established at the 1949 Lisbon conference of the International Geographical Union. Drawing on Wright’s correspondence in the AGS archives, this paper examines the debates between the national cartographic agencies and related societies involved in the future of the IMW, with particular reference to the transfer of the project’s Central Bureau from the British Ordnance Survey in Southampton to the United Nations in New York in the early 1950s. This discussion, which focused mainly on the need to combine the IMW with an internationalized version of the US-dominated 1:1 million World Aeronautical Chart, reveals the on-going tensions between the ideals of scientific internationalism embodied in the IMW’s original proposal and the harsh realities of national self-interest in the early years of the Cold War.