融合图像显著区域二维形状特征的图像检索

为研究在基于内容的图像检索中形状特征对图像检索效果的影响,提出了一种融合图像显著区域二维形状特征的图像检索方法。提取图像中显著区域的形状特征,融合图像的纹理和颜色特征来对图像进行检索。当目标存在变形和大小存在巨大差异时,目前缺乏完善的数学模型来提取图像的形状特征,该方法很好地弥补了这种缺陷。通过实验结果表明,该方法能够提高图像检索的准确率。     

基于颜色纹理和形状特征相结合的图像检索系统

灰度共生矩阵是一种有效的纹理图像分析方法,为了更有效地进行图像检索,定义了一种新型的灰度共生矩阵描述子,该矩阵描述子能够有效结合颜色、纹理和形状特征,通过描述像素的空间相关性来进行基于内容的图像检索. 利用该矩阵描述子进行图像检索时,先在RGB颜色空间中计算彩色梯度,然后利用灰度共生矩阵来描述图像特征. 实验结果表明其检索性能优于传统的普通灰度共生矩阵.     

基于综合特征的图像检索

 基于内容的图像检索在多媒体数据库管理中得到越来越多的重视,介绍分别基于颜色、形状、纹理特征3种图像检索的方法.在利用单一特征检索的基础上,进行了组合特征的检索比较,提出了1种特征匹配算法的动态分配.对真实图像数据库的检索实验表明,这种方法的检索效果很好.     

基于多特征融合的海洋生物图像检索方法的研究

基于内容的图像检索技术主要是通过提取图像的颜色、形状、纹理等可视特征作为图像检索依据,对图像库进行近似检索.针对海洋生物图像的特点,将离散余弦变换技术应用到图像检索中,计算基于圆环分割的图像块的DCT能量矩得到图像的纹理信息.在此基础上,提出了一种综合DCT能量矩和不变矩的多特征融合的图像检索方法,并将其应用到海洋生物图像检索中.实验结果表明,使用该方法可以提高海洋生物图像检索的准确率,且对图像的旋转、缩放和平移具有不变性.     

结合彩色边缘与LBP纹理的图像检索算法

基于图像颜色、纹理和形状单一特征的特征提取和匹配的方法很多,各有优缺点,因此,本文提出了将图像中心区域的uniform模式的LBP纹理与环形分块彩色边缘相结合的图像检索算法。常用的形状检索算法只能对连续封闭曲线才有好的检索效果,而对自然彩色图像检索效果较差,而本文将图像分成几个环形分块,对每一环形分块内的图像提取彩色边缘并形成颜色直方图用于图像形状描述。纹理采用uniform模式的LBP描述,最后采用加权法融合形状特征和纹理特征。根据实验比较,该算法能较大提高大多数类别图像检索的查准率。     

基于内容的卫星云图检索方法

为了有效地管理和利用大规模卫星云图数据库,需要为其增加检索功能,尤其是基于内容的检索.探讨了将基于内容的图像检索(CBIR)技术应用于卫星云图检索,选择使用了颜色、纹理和形状特征方法.颜色特征包括:灰度直方图和灰度聚合向量;纹理特征从小波子图提取,采用直方图拟合法和分块直方图拟合法;形状特征提取采用了新提出的一种专门针对云目标的"可变形模型"方法——圆形基元法.对每种特征定义了图像距离或者相似度,进行了检索比较实验.结果表明,CBIR用于卫星云图检索是可行的,形状特征方法因融入了领域知识而具有较突出的检索效果,但效率仍需提高.     

基于内容的图像检索

本论文系统介绍了基于内容的图像检索技术。所谓基于内容的检索,就是查询时针对的是对象而不是标识,它需要从图像中提取指定的特征(如颜色、纹理、形状等),然后从图像库中检索相似的图像或者视频内容。由于基于内容的图像检索能够提供比传统的基于文本的图像检索更丰富的内容及实用的功能,因此已成为国际上的研究热点。本文结合用户感兴趣物体的颜色,形状和纹理信息进行图像检索,取得了良好的检索效果。     

一个多特征结合的图像检索技术

图像数据库应用日益广泛,如何高效、准确地进行图像的检索成为一项重要的研究领域。传统的图像检索主要依赖颜色、纹理、形状、空间关系等单一视觉特征,检索效果往往不够理想。针对这一实际问题,提出一种新的图像检索方法,通过对图像进行小波变换,获得纹理和形状的综合特征,对综合特征进行归一化处理,并将其作为图像相似性的衡量依据。实验证明基于纹理和形状特征的图像检索具有很好的效果。     

基于内容的彩色细胞图像检索

提出了一种结合颜色、纹理和形状特征的细胞病理图像检索方法．首先,运用K-均值聚类方法提取出细胞核,并且采用多域值分割算法去除细胞图像中的背景区域．提取的特征包括颜色、纹理和形状等,这些特征能很好地表征单核细胞的主要特性．由于提取的特征数值范围以及物理意义不尽相同,对特征进行了归一化处理．最后提出了相关的反馈系统．该系统可以自动地调整不同特征的权值,提高了图像检索的准确率．运用该方法进行细胞图像的检索更符合人的视觉感觉要求,比仅仅提取一个特征的方法更加准确．     

基于特征关联融合的图像检索方法

鉴于单一特征检索效果的不足,提出基于颜色和纹理特征相互关联融合的图像检索新方法。利用非等间隔量化HSV颜色空间,提取图像的颜色特征,利用Gabor小波提取图像的纹理特征;对内容分布简单的检索图像,采用图像底层特征串行关联(FSC)方法,对内容分布复杂的检索图像,采用基于典型相关分析(CCA)的图像底层特征并行关联(FPC)的方法,融合颜色特征和纹理特征进而检索图像。     

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.     

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.     

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.     

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.     

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.     

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.     

Achieving Unusual States of Matter Under High Pressure

正The periodicity of the elements and the non-reactivity of the inner-shell electrons are two related principles of chemistry,rooted in the atomic shell structure.Within compounds,Group I elements,for example,invariably assume the+1 oxidation state,and their chemical properties differ completely from those of the p-block elements.These general rules govern our understanding of chemical structures and reactions.Using first principles calcula-     

Exchange-Correlation and Electronic Excitation Energies from Pairing Matrix Fluctuations

We have developed an adiabatic connection to formulate the ground-state exchange-correlation energy in terms of pairing matrix linear fluctuations.This formulation of the exchange-correlation energy opens a new channel for density functional approximations based on the many-body perturbation theory.We illustrate the potential of such approaches with an approximation based on the particle-particle Random Phase Approximation(pp-RPA).This re-     

Density Functional Theory for the Response of Periodic Systems to Electric Fields Based on the Vector Potential Approach

正The electronic and nuclear(structural/vibrational)response of 1D-3D nanoscale systems to electric fields gives rise to a host of optical,mechanical,spectral,etc.properties that are of high theoretical and applied interest.Due to the computational difficulty of treating such large systems it is convenient to model them as infinite and periodic(at least,in first approximation).The fundamental theoretical/computational problem in doing so is that