Local algorithms on dense two-frame stereo matching

Stereo matching is a fundamental and crucial problem in computer vision. In the last decades, many researchers have been working on it and made great progress. Generally stereo algorithms can be classified into local methods and global methods. In this paper, the challenges of stereo matching are first introduced, and then we focus on local approaches which have simpler structures and higher efficiency than global ones. Local algorithms generally perform four steps: cost computation, cost aggregation, disparity computation and disparity refinement. Every step is deeply investigated, and most work focuses on cost aggregation. We studied most of the classical local methods and divide them into several classes. The classification well illustrates the development history of local stereo correspondence and shows the essence of local matching along with its important and difficult points. At the end we give the future development trend of local methods.     

非均匀分布的无线传感器网络分簇路由算法

针对无线传感器网络(WSN)现有分簇路由协议中选举的簇头节点在监测区域内分布不均的问题,提出一种基于局部区域传感器网络节点分布数量控制簇头节点选举概率的算法HNDCRA。该算法通过对传感器网络检测区域的网格划分,计算出网格局部区域的传感器节点分布,并以此为依据确定传感器节点当选簇头的概率,来保证选举后每个网格都有簇头节点,且节点数量多的区域节点当选簇头概率较大,使得簇头随节点分布密度“均匀”,达到能耗均衡的目的。性能分析和仿真实验表明,与经典的LEACH协议相比,HNDCRA能够更好地将簇头“均匀”分布到网络区域,均衡全网能耗分布,提高能量利用率,从而延长网络生存时间。     

带有局部控制因子的图割光流估计

提出一种带有局部空间项控制因子的图割光流估计算法,能判断和处理光流场的平移遮挡现象。文中分析了平移遮挡的形成机理,构造了遮挡判别公式,基于本次的正向和反向光流场,依靠遮挡判别结果调节局部空间项控制因子,建立下次的能量泛函,加强背景区域对遮挡区域的平滑作用,隔绝运动区域对遮挡区域的平滑作用,从而构造出新结构的网络流图。另外,该算法被证明可以阻断遮挡误判在各次图割优化过程间的传递,从而使逐次α-扩散移动图割光流算法具有自适应处理遮挡的能力。通过与Ground-truth光流场的实验对比,表明该算法能较好地判断与处理遮挡导致的光流场无效区域。     

滑动窗口式三维Watershed算法实现视频序列分割

视频序列分割是实现视频对象提取、处理和识别的基础,也是基于内容的视频压缩和检索的前提。目前普遍采用的watershed算法是全局涨水算法,用于视频分割时占用的存储和处理空间巨大。针对这一问题本文提出了新的滑动窗口式三维watershed算法(SW3DW),通过时间轴上的局部窗口对视频序列进行观察和分割,而在相邻窗口间采用水源区标号传递和局部流域更新相结合的方法,以较小的存储和处理空间实现了局域和全局处理的一致性。理论分析和实验证明该算法能有效性地实现视频序列的分割,为后续视频对象提取和处理创造了条件。     

我国地方高水平大学建设的现状、困境与路径

地方高水平大学的崛起是我国高等教育改革和发展进程中的新趋向,对我国现有高等教育格局带来很强的冲击。在建设高等教育强国和高等教育强省目标引领下,加快地方高水平大学建设成为我国高等教育发展的主旋律。论文从我国地方高水平大学兴起的缘由入手,深入分析地方高水平大学建设的现状及存在的问题,并针对性地提出解决思路与举措。目的在于全面认识当前我国地方高水平大学的发展形势及未来发展态势,为加快建设地方高水平大学提出积极建议。     

A novel technique for local mass transfer measurements

A novel electrodeposition technique is developed to estimate time‐averaged convective local mass transfer coefficients. This method is based on the diffusion‐controlled deposition rate of copper. With an electrolyte solution consisting of H2SO₄ and CuSO₄, copper is dissolved at the anode and deposited onto the nickel cathode. The thickness of the copper, measured with an optical microscope, provides an estimate of the time‐averaged local mass transfer coefficient for the given location, and by depositing multiple layers, the coefficients under different flow conditions can be obtained from one cathode. The results for laminar flow in a smooth, round pipe showed good agreement with those calculated from the analytical Leveque solution. Results were also obtained for turbulent flow and demonstrate the potential for acquiring convective local mass transfer coefficients for various flow configurations.     

引进设备与技术的价格确定

探讨了引进设备与技术的价格计算方法，对当前尚未明确的取费基数及计算公式进行了确认，对国外运输费、国外运输保险费、关税等从属费用的计取进行了规范。     

Models for circular data from time series spectra

Circular data are those for which the natural support is the unit circle and its toroidal extensions. Numerous constructions have been proposed which can be used to generate models for such data. We propose a new, very general, one based on the normalization of the spectra of complex-valued stationary processes. As illustrations of the new construction's application, we study models for univariate circular data obtained from the spectra of autoregressive moving average models and relate them to existing models in the literature. We also propose and investigate multivariate circular models obtained from the high-order spectra of stationary stochastic processes generated using linear filtering with an autoregressive moving average response function. A new family of distributions for a Markov process on the circle is also introduced. Results for asymptotically optimal inference for dependent observations on the circle are presented which provide a new paradigm for inference with circular models. The application of one of the new families of spectra-generated models is illustrated in an analysis of wind direction data.     

广义文脉与规划设计教育

城市规划设计教育不仅应关注历史化,还应关注自然、社会和经济;不仅应关注地方和传统,还应关注全球和未来。城市规划教育应掌握正确的发展观和方法论,肩负起发展地万脉的历史使命,保护社会公众的利益,推动城市持续发展。     

循环流化床燃烧室换热系数试验研究

利用自制的热流计和物料浓度取样器,在７５ｔ／ｈ循环流化床锅炉上测定了不同灰浓度下床对受热面壁面的换热系数,分析了床对受热面换热系数的影响因素,确定了固体物料浓度与换热系数的关系,开发了综合考虑床温、流化速度的半经验模型,与文献值相比吻合得较好。