基于SPOT与ETM+影像融合方法的实验及融合质量评价

通过对SPOT影像全色波段和ETM+多光谱影像、ETM+全色波段和ETM+多光谱影像两组数据的实验,从定性、定量的角度对两种融合方法进行了分析和评价,归纳出适用于SPOT全色波段与ETM+多光谱影像和ETM+全色波段影像与ETM+多光谱影像的融合方法.     

北京一号高分辨率影像数据融合效果评价

以不同空间数据分辨率融合算法对北京一号卫星数据进行了效果分析,该数据的影像融合及统计分析结果表明,北京一号卫星数据在多光谱与全色波段融合后不仅很好地保留了全色波段的纹理信息,同时影像的多光谱信息有较大增强,使得影像信息量较融合前大幅提高,其在资源环境遥感监测领域的应用前景也明显改观.     

基于HIS变换融合IKONOS不同分辨率影像

运用基于HIS变换的图像融合方法,将IKONOS遥感卫星获取的天安门附近4m低分辨率多光谱影像和1m高分辨率的全色波段影像进行融合,得到了1m高分辨率的多光谱影像。     

基于IHS变换和小波变换相结合的IKONOS影像融合技术

为了充分利用各种遥感影像的信息,基于多分辨率小波融合的融合方法在近几年来得到了广泛的应用。针对IKONOS卫星的全色波段和多光谱波段的影像,提出了一种基于IHS变换和小波变换结合的影像融合方法。对比实验表明了这种结合两种变换的融合方法能够有效保持IKONOS卫星全色影像高空间分辨率的同时,且能较好地保留多光谱影像的光谱信息。     

基于Brovey融合的卫星影像土地覆盖变化检测

随着高空间分辨率卫星影像的发展,如ETM ,QuickBird,IKONOSE等高空间分辨率卫星,近20年来已相继开发了许多影像融合的方法,如HIS,PC,HPF,SFIM,SVR,Wavekt和Brovey等融合法．传统的影像融合是将时相相同或相近的影像进行融合,以提高影像的空间分辨率和光谱分辨率,提高影像的目视可解度和分类精度等．而本文却是对不同时相的影像进行融合,用Brovey融合法将不同时相的TM(1986年7月26日)和ETM (2000年5月4日)的Pan波段影像进行融合,再对融合后的影像采用无监督分类和PC2分析两种方法将两时相的土地覆盖变化区域提取出来．研究证明融合法能快速、简便、准确的检测出土地覆盖变化的区域。     

SPOT-5遥感影像自身融合方法的比较研究

近年来,遥感影像数据融合已成为学术界研究的新热点.作为在各个领域应用日益广泛的法国SPOT-5遥感卫星影像,其全色波段空间分辨率高,多光谱波段光谱信息丰富,为了既保留丰富的光谱信息又能提高空间分辨率,本文在对IHS变换、主成分变换、Brovey变换融合3种传统像素级融合方法分析、归纳与算法实现研究的基础上,对SPOT-5全色波段与多光谱波段进行了图像融合实验,并从光谱特征与空间纹理特征两个方面对融合效果进行定性与定量评价.分析结果表明,Brovey变换融合法光谱退化最小,同时也最大程度地保持了高几何分辨率全色波段的空间信息.     

不同融合算法对ETM+遥感影像分类精度的影响分析

以福州市南台岛的ETM+遥感影像为基础数据,利用ERDAS Imagine 8.7、ENVI4.0等遥感影像处理软件,运用主成分法(PCA)、乘积法(MLT)、Brovey变换和HIS变换融合算法对ETM+遥感影像全色波段(第8波段)与多光谱波段(第1-5、7波段)进行融合试验;从融合影像的光谱保真度、高频空间信息融入度等角度对融合后的影像进行比较分析;对各种融合后影像进行非监督分类,并评价各种分类结果进行精度,为用户进行影像分类前选择融合方法提供参考.     

SPOT多光谱影像与全色影像融合研究

图像融合是解决多源遥感图像综合的有效技术手段,针对不同数据源选择最佳的融合方法是提高图像融合质量的关键.分析Gram_Schmidt融合算法的理论、算法和融合步骤的基础上,对SPOT的多光谱波段影像和全色波段影像进行融合,目视效果从色调、纹理和清晰度等方面进行定性分析,定量分析是根据均值、标准方差、扭曲程度指标进行分析,对融合后影像质量做出了评价.研究结果表明:SPOT影像采用Gram_Schmidt变换融合效果保持了较高的空间分辨率同时光谱保持较好,Gram_Schmidt融合算法适合高分辨遥感影像融合.     

基于光谱范围的IHS改进融合方法研究

针对Intensity-Hue-Saturation(IHS)融合算法对高分二号卫星多光谱(MS)影像和全色(PAN)影像融合时所产生的光谱失真现象,提出了一种基于光谱范围的IHS融合改进方法(SIHS).该方法首先将多光谱影像进行重采样,使其与全色影像大小相同,然后使用光谱范围对重采样后的多光谱影像各波段加权平均获得亮度分量I,再对全色影像和I进行直方图匹配,最后使用快速IHS融合算法得到最终融合影像.通过实验,将该方法的融合结果与FIHS、Gram-Schmidt和NNDiffuse融合结果进行主客观评价.结果表明该方法在对光谱信息保留上优于其他融合算法,可以更好地支持影像信息的分类和检测.     

基于中巴资源卫星的多源遥感影像融合研究

随着遥感获取数据手段的日益增多,遥感影像的融合技术备受关注。针对资源二号多光谱影像光谱信息丰富、分辨率低,资源二号全色影像分辨率高、纹理信息丰富的特点,以河南省郑州市的资源二号多光谱影像与全色影像为例,分别采用基于主成分分析、小波变换、比值变换和高通滤波法等4种融合方法进行融合实验,并对融合后的影像在均值、标准方差、偏差指数以及光谱保真度等4个方面进行了对比,探讨了资源二号多光谱影像与全色影像融合的方法和效果。     

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.     

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     

On the Thermodynamic Limit for Responses to Static Electromagnetic Fields

For molecular systems,the quantum-mechanical treatment of their responses to static electromagnetic fields usually employs a scalar-potential treatment of the electric field and a vector-potential treatment of the magnetic field.Although the potential for each field separately is associated with the choice of an(unphysical)origin,the precise choice of the origin for the electrostatic field has little consequences for the results.This is different for the