基于视觉重要区域的立体图像视觉舒适度客观评价方法

先进的立体视频技术能给观众带来深度感和沉浸感,但也容易使人产生视觉疲劳,造成观看体验质量的下降,因此,如何对立体视频/图像的视觉舒适度进行有效评价是目前的研究难点。该文提出一种基于视觉重要区域的立体图像视觉舒适度客观评价模型,该模型主要包括3个部分：(1)利用图像显著图和视差图像得到立体图像视觉重要区域;(2)提取视觉重要区域的视差幅度特征、视差梯度边缘特征以及空间频率特征,作为反映立体图像视觉舒适度的感知特征信息;(3)通过支持向量回归建立特征信息与立体图像舒适度平均主观评分值的关系,预测得到立体图像视觉舒适度的客观评价值。实验结果表明,与现有的方法相比较,在相同的立体图像测试库上,采用该文提出的客观评价模型可以获得更好的评价性能。     

基于感兴趣区的图象近无损压缩

无损感兴趣区（Lossless Region of Interest (ROI)图象压缩方法,即在感兴趣区采用无损压缩,而在其他区域采用有损压缩,从而保证了重要信息不丢失,并尽可能提高衅象的压缩比,在整形小波变换（IWT）和嵌入式零树编码的基础上,实现了无损感兴趣区（Lossless ROI)的图象近无损压缩,并提出了一种小波变换域形状编码算法－－树映射形状编码,同时给出了算法的原理及实现,并进行了相关实验,实验结果表明,该算法能够提高压缩效率,且压缩效率取决于感兴趣区的大小以及对不感兴趣区图象的质量要求。     

Constructing a typology of H2 in cities and regions: An international review

This paper primarily develops a seven-fold conceptual typology of place-based hydrogen initiatives. Through an international review of place-based hydrogen initiatives we reveal a plethora of projects, demonstrations, test-beds, ambitions and expectations at a wide range of spatial scales. We ask whether there is anything distinctive about how these different spatial scales attempt to develop the hydrogen economy. In particular, we seek to identify whether patterns emerge around the social interests involved at different scales of activity and the degree to which hydrogen links to different place-based agendas—political and resource autonomy, economy and employment. The paper addresses these questions and draws out a series of three key conclusions. First, there is wide ranging and significant diversity in the motivations for cities and regions to become involved in hydrogen economy developments—wider than conventional energy policy objectives. Second, there are still significant overlaps between different scales of action. Third, there is a tension between the more bounded concepts of using hydrogen to build self-reliance at a particular scale and those initiatives oriented around developing a more systemic technological system which is rolled out elsewhere. Finally, we argue that a key issue for further research is in understanding the social interests and institutions that attempt to both learn from across these activities at different scales and provide some sense of coordinated action between them. In our review the role of corporates—rather than national government—seems to be critical to such attempt to provide coordination across places and needs to be the focus of further research.     

Oracle 7的空间数据管理技术

由于空间数据的非结构化特点,传统的管理方法是采用文件系统,导致数据一致性、完整性及完全性等问题。如何利用数据库技术管理空间数据是同行关注的问题。Ｏｒａｃｌｅ７的空间数据管理技术成功解决了两个关键问题：如何在单一数据库中存取及管理不同类型的数据;如何改善拥有浩翰空间数据的空间数据库的性能。本文拟详细分析和讨论该技术。     

Frameworks, Networks and the UK Regional Agenda: nature planning for landscapes?

Planning at the landscape scale in Britain has had limited application. The origins, implementations and likely outcomes of new approaches to nature planning in Britain in which the spatial scale of planning could be 'landscape enabled' are traced. These approaches are termed 'framework' strategies, within which 'ecological networks' can be developed in order better to reflect species' behaviour and to overcome the restrictions of designation-based nature conservation. Currently, planning structures are subject to change and debate: published planning documents and other sources are examined for a case study of the North West of England, where experiments in ecological networks are underway. Evidence is sought for the incorporation into new planning structures of key concepts relevant to the achievement of network implementation. Evaluation is made of likely critical 'pinch points' in implementation using experience of network planning in the Netherlands for comparison. These include availability of data on habitats and species, the relationship of planning to agriculture, and the need for co-operation from stakeholders.     

蜀地"三国演义"漫谈成都当前的建筑创作格局

针对当前成都三种建筑创作“势力”鼎足的局面,文章研究了来自境外设计机构、国内发达地区和蜀地本土设计力量的博弈,评述了他们各自的创作特点、影响力和发展趋势,并对今后成都的建筑创作格局,尤其是本土力量的创作进行了展望。     

新疆地域建筑的过去与现在

本文通过回顾新疆地域建筑的发展历程,分析影响创作的诸多因素,试图寻找地域创作的新契机。     

长江三角洲多中心城市区域与多层次管治

多中心城市区域已经成为世界各地城镇密集地区发展的主要空间形态。在这一城市区域空间内也出现了多层次的管治,以应对全球化环境下愈演愈烈的城市竞争。本研究对长江三角洲进行实证研究,发现长三角正在呈现多中心的发展态势。同时由于地方政府的非理性发展,长三角地区出现了投资争夺、基础设施建设冲突和产业结构等问题。为解决这些问题,从国家到县（市）的不同层面,出现了各种管治新形式,相互交织,并正在逐渐形成多层次的区域管治体系。