基于NSCT与形状特征的遥感影像道路提取

提出一种基于非抽样Contourlet变换（NSCT）与形状特征的遥感影像道路提取算法.首先对图像进行非抽样Contourlet变换,得到不同尺度、不同方向上的变换系数,对变换系数进行增强处理并通过反变换得到增强图像;然后对增强图像进行分割处理,利用道路形状特征对分割结果进行道路提取;最后利用光谱特征对提取的道路进行判断,并利用形态学方法对道路网进行规整.对比实验结果表明：该算法取得了较好的高分辨率遥感影像道路提取效果.     

基于形态学梯度重构的高分辨率遥感影像分割方法

基于形态学梯度重构提出一种用于高分辨率遥感影像的分割方法.针对遥感图像的特点构建多形状结构元素,然后使用该结构元素对图像提取形态学梯度并进行开闭重构;根据人的视觉特征,对梯度的高对比度区域进行还原,用于保证较高的局部对比度;最后使用浸没式分水岭变换获得分割结果.对IKONOS影像进行分割实验,结果表明了该方法的有效性.     

基于阈值分割与数学形态学的高分辨率遥感影像道路信息提取

从高分辨率遥感影像中快速,有效的提取道路信息,一直是遥感学界研究的热点和难点问题。本文研究了一种基于阈值分割与数学形态学的高分辨率遥感影像道路提取算法,该算法不需人工给出道路种子点,方向等信息,在某种意义上提高了道路提取的自动化程度。提取过程是:首先利用阈值分割将遥感影像分割成包含道路信息的二值图像,然后利用数学形态学运算对二值图像进行处理,根据道路形态特征提取出道路区域。     

结合高分辨率多光谱影像和LiDAR数据提取城区建筑

结合IKONOS影像和LiDAR数据,应用面向对象分类分析方法试验提取高分辨率多光谱卫星影像城区建筑物.处理流程包括如下步骤:(1)影像融合增强;(2)影像分割;(3)影像对象分类;(4)建筑物对象几何形状规则化处理.试验结果表明,面向对象分类分析是一种适于利用高空间分辨率遥感影像数据进行城区建筑物制图的有效方法.该方...     

一种基于Snake模型的遥感影像道路网半自动提取方法

在遥感影像中,道路不仅是一种重要的基础地理信息,而且还是提取其它地物目标的线索和参考,道路的正确提取对遥感影像的深入应用具有重要意义.然而,到目前为止,遥感影像道路网的全自动化提取仍处于探索阶段,现有研究仍多侧重于道路的半自动提取方法.本研究在归纳和总结现有典型的几种道路半自动提取方法基础上,提出了一种基于Snake模型的遥感影像道路网半自动提取方法,针对该方法中能量函数的构造、收敛迭代条件的设置、道路中角点的判断、角点及道路网中交点的提取等问题进行了讨论.最后对所提出的方法进行了实验验证,结果表明:基于Snake模型的遥感影像道路网半自动提取方法能够从覆盖范围大、场景复杂、噪声较多的遥感影像中实现道路网的提取且只需少量的人机交互,从而极大地提高了道路提取的效率.     

利用最小二乘匹配算法提取影像道路网

针对遥感影像道路网提取问题,提出了利用最小二乘匹配算法进行道路网智能化提取的思想,通过对影像进行预处理、种子点选取、最小二乘匹配、道路段筛选和连接来实现道路网的提取.利用多组影像进行验证的实验结果显示:该方法能够较好地对道路网进行识别,且具有较好的鲁棒性.     

高分辨率遥感影像分割提取构筑物评估

面向对象的影像分析已成为针对高分辨率遥感影像信息提取和行业应用的一种先进方法.该方法的实用效果,基础和关键在于对影像中所关注地物目标的影像分割提取效果.针对高分辨率遥感影像地面构筑物的提取,采用经验性符合统计比较法,把自动分割结果与人工分割提取的地面构筑物区域轮廓相对符合程度分为3个等级:良好、可以接受和不可接受,对当前应用广泛的两种多尺度影像分割方法进行了地面构筑物分割提取效果评估.     

基于双层案例推理模型的高分辨率遥感影像道路提取方法

为实现高分辨率遥感影像道路信息的自动提取,引入案例推理思想,提取道路影像的光谱、形状、纹理和影像间拓扑关系特征信息,构建多层案例库,在传统案例推理模型的基础上进行改进,提出多层案例推理模型.结合影像预处理、权重分配和分层检索,实现多层案例推理模型的高分影像道路信息提取.通过道路信息提取、案例自学习、案例适用试验及与SVM方法对比分析,证明该方法基本实现道路信息提取的目标.     

基于相似度滤波算法的视网膜血管分割

在计算机辅助眼底图像视网膜血管分割中,基于匹配滤波算法的应用非常广泛.而传统匹配滤波器算法存在分割细小血管效果较差、噪声多以及视盘干扰等问题.本文提出一种相似度滤波算法的眼底图像视网膜血管分割方法.首先用多层阈值和水平集算法提取视盘干扰区域,利用高斯模糊去除视盘干扰区域.然后采用相似度滤波运算对去除视盘干扰的彩色眼底图像进行处理.最后,将余弦相似度图进行二值化后与余弦相似度加强图进行区域连通性判断,实现眼底图像视网膜血管分割.结果 表明,该算法能较好地分割细小血管以及去除视盘干扰,能更为准确地提取眼底图像视网膜血管.     

不同尺度下高分辨率遥感影像道路信息提取

道路作为衡量城市发展的主要因素,是城市发展过程中更新最快的要素之一,其发展直接影响城市功能用地的布局,因此基于高分辨率遥感影像的道路信息提取具有重要而现实的意义.在综合分析各种高分辨率影像道路提取方法的基础上,提出了基于不同尺度进行影像特征基元分割、并结合知识辅助实现基元分析的方法.该方法能够有效地通过面向对象方式将影像中的道路进行精确地提取,并可根据用户研究尺度的不同提取出不同规模的城市道路,最后结合具体实例对这种方法进行了分析.     

Markedness and its Interpretation in Language Use

Language markedness is a common phenomenon in languages, and is reflected from hearing, vision and sense, i.e. the variation in the three aspects such as phonology, morphology and semantics. This paper focuses on the interpretation of markedness in language use following the three perspectives, i.e. pragmatic interpretation, psychological interpretation and cognitive interpretation, with an aim to define the function of markedness.     

Lower Paleozoic oil relationships within Williston Basin, Canada

The Williston Basin is a significant petroleum province, containing oil production zones that include the Middle Cambrian to Lower Ordovician, Upper Ordovician, Middle Devonian, Upper Devonian and Mississippian and within the Jurassic and Cretaceous. The oils of the Williston Basin exhibit a wide range of geochemical characteristics defined as "oil families", although the geochemical signature of the Cambrian Deadwood Formation and Lower Ordovician Winnipeg reservoired oils does not match any "oil family". Despite their close stratigraphic proximity, it is evident that the oils of the Lower Palaeozoic within the Williston Basin are distinct. This suggests the presence of a new "oil family" within the Williston Basin. Diagnostic geochemical signatures occur in the gasoline range chromatograms, within saturate fraction gas chromatograms and biomarker fingerprints. However, some of the established criteria and cross-plots that are currently used to segregate oils into distinct genetic families within the basin do not always meet with success, particularly when applied to the Lower Palaeozoic oils of the Deadwood and Winnipeg Formation.     

An Analysis of Catherine＇s Character——Wuthering Heights

Wuthering Heights, Emily Bronte＇s only novel, was published in December of 1847 under the pseudonym Ellis Bell. The book did not gain immediate success, but it is now thought one of the finest novels in the English language. Catherine is the key character of this masterpiece, because everybody and everything center on her though she had a short life. We can understand this masterpiece better if we know Catherine well.     

Characterization of Ordovician carbonate reservoirs, southeastern Saskatchewan, Canada

The discovery of the prolific Ordovician Red River reservoirs in 1995 in southeastern Saskatchewan was the catalyst for extensive exploration activity which resulted in the discovery of more than 15 new Red River pools. The best yields of Red River production to date have been from dolomite reservoirs. Understanding the processes of dolomitization is, therefore, crucial for the prediction of the connectivity, spatial distribution and heterogeneity of dolomite reservoirs.The Red River reservoirs in the Midale area consist of 3～4 thin dolomitized zones, with a total thickness of about 20 m, which occur at the top of the Yeoman Formation. Two types of replacement dolomite were recognized in the Red River reservoir: dolomitized burrow infills and dolomitized host matrix. The spatial distribution of dolomite suggests that burrowing organisms played an important role in facilitating the fluid flow in the backfilled sediments. This resulted in penecontemporaneous dolomitization of burrow infills by normal seawater. The dolomite in the host matrix is interpreted as having occurred at shallow burial by evaporitic seawater during precipitation of Lake Almar anhydrite that immediately overlies the Yeoman Formation. However, the low δ18O values of dolomited burrow infills (-5.9‰～ -7.8‰, PDB) and matrix dolomites (-6.6‰～ -8.1‰, avg. -7.4‰ PDB) compared to the estimated values for the late Ordovician marine dolomite could be attributed to modification and alteration of dolomite at higher temperatures during deeper burial, which could also be responsible for its 87Sr/86Sr ratios (0.7084～0.7088) that are higher than suggested for the late Ordovician seawaters (0.7078～0.7080). The trace amounts of saddle dolomite cement in the Red River carbonates are probably related to "cannibalization" of earlier replacement dolomite during the chemical compaction.     

Features of Women's language

Language is a means of verbal communication. People use language to communicate with each other. In the society, no two speakers are exactly alike in the way of speaking. Some differences are due to age, gender, statue and personality. Above all, gender is one of the obvious reasons. The writer of this paper tries to describe the features of women＇s language from these perspectives： pronunciation, intonation, diction, subjects, grammar and discourse. From the discussion of the features of women＇s language, more attention should be paid to language use in social context. What＇s more, the linguistic phenomena in a speaking community can be understood more thoroughly.     

Design and analysis of generic LBS application developing platform

Location based services is promising due to its novel working style and contents.A software platform is proposed to provide application programs of typical location based services and support new applications developing efficiently. The analysis shows that this scheme is easy implemented, low cost and adapt to all kinds of mobile nework system.     

橡胶颗粒沥青混合料低温抗裂性试验研究

以AC-13级配为基础,将橡胶颗粒代替部分集料掺入混合料中,以低温弯曲试验为评价方法对不同橡胶颗粒掺量下沥青混合料的低温抗裂性进行研究,并引入应变能密度值对混合料的低温抗裂性进行综合评价.试验结果表明:橡胶颗粒沥青混合料试件的破坏微应变均超过2 300,满足冬寒区的技术指标;无论是否掺加橡胶颗粒,随着温度的下降,沥青混合料破坏时的最大弯拉强度增大,弯拉应变降低,劲度模量增大;弯曲应变能密度在胶粒掺量为1%左右时具有较大的弯曲应变能密度值,此时橡胶颗粒沥青混合料具有较好的低温抗裂性.     

A computer generator for randomly layered structures

AcomputergeneratorforrandomlylayeredstructuresYUJia shun1,2,HEZhen hua2(1.TheInstituteofGeologicalandNuclearSciences,NewZealand;2.StateKeyLaboratoryofOilandGasReservoirGeologyandExploitation,ChengduUniversityofTechnology,China)Abstract:Analgorithmisintrod…     

低渗透非均质砂岩油藏启动压力梯度研究

理论推导与室内实验相结合,建立了低渗透非均质砂岩油藏启动压力梯度确定方法。首先借助油藏流场与电场相似的原理,推导了非均质砂岩油藏启动压力梯度计算公式。其次基于稳定流实验方法,建立了非均质砂岩油藏启动压力梯度测试方法。结果表明:低渗透非均质砂岩油藏的启动压力梯度确定遵循两个等效原则。平面非均质油藏的启动压力梯度等于各级渗透率段的启动压力梯度关于长度的加权平均;纵向非均质油藏的启动压力梯度等于各渗透率层的启动压力梯度关于渗透率与渗流面积乘积的加权平均。研究成果可用于有效指导低渗透非均质砂岩油藏的合理井距确定,促进该类油藏的高效开发。     

On Tragic Consciousness In The Works By Ernest Hemingway

As an American modern novelist who were famous in the literary world, Hemingway was not a person who always followed the trend but a sharp observer. At the same time, he was a tragedy maestro, he paid great attention on existence, fate and end-result. The dramatis personae's tragedy of his works was an extreme limit by all means tragedy on the meaning of fearless challenge that failed. The beauty of tragedy was not produced on the destruction of life, but now this kind of value was in the impact activity. They performed for the reader about the tragedy on challenging for the limit and the death.