基于小波变换的多尺度图像边缘检测算法

针对边缘检测算子的抑噪能力和定位精度之间矛盾,提出了一种基于B样条小波变换的边缘检测方法.首先对图像进行小波多尺度分解,在每种尺度下分别提取图像边缘;而后利用边缘信息的多尺度特性,融合多尺度边缘得到了单像素宽边缘.通过计算机仿真对该方法进行验证,实验结果表明该方法不仅能准确检测出图像边缘,而且能有效地抑制噪声,效果优于传统的边缘检测算法.     

基于小波变换的多尺度图像边缘检测算法

针对边缘检测算子的抑噪能力和定位精度之间矛盾,提出了一种基于B样条小波变换的边缘检测方法。首先对图像进行小波多尺度分解,在每种尺度下分别提取图像边缘;而后利用边缘信息的多尺度特性,融合多尺度边缘得到了单像素宽边缘。通过计算机仿真对该方法进行验证,实验结果表明该方法不仅能准确检测出图像边缘,而且能有效地抑制噪声,效果优于传统的边缘检测算法。     

基于二进小波变换的图像边缘检测算法研究

图像边缘是图像最基本的特征,是分析理解图像的基础.图像边缘信息的改变意味着图像基本内容或结构的变化.本文研究了利用二进小波变换的方法进行图像边缘特征提取,并通过图像边缘相关算子的理论区分边缘特征点和噪声,然后将不同尺度下的图像边缘特征点,根据小波变换模值跨尺度传递特性,进行多尺度下的图像边缘融合.实验结果表明,该方法克服了传统梯度运算对噪声的放大影响,同时也克服了单尺度下噪声抑制与边缘细节提取精度之间的矛盾.     

多尺度小波边缘检测算法研究

根据采用小波变换提取图像边缘的多尺度特性,对小波多尺度间的相关性进行了分析,提出多尺度小波变换相关算子,分析了相关算子的滤波特性,利用相关算子对图像的多尺度边缘信息进行了优化。既保留了图像中重要的细节边缘信息,又剔除大量的冗余边缘和虚假边缘,有效地提取出了图像的特征边缘。     

基于小波变换的图像边缘检测

基于信号与噪声在不同尺度下小波系数模的变化特征，利用小波变换系数模局部极大值来提取图像的边缘特征。实验结果说明了这种特征提取方法能够较准确地提取图像的边缘并有效地降低噪声。     

基于小波分解的痕迹灰度图像边缘检测

针对痕迹图像边缘检测的特征，给出了一种新的基于小波多尺度分解的分层图象边缘检测方法，其基本思想是先对源图像进行小波多尺度分解，其次在不同尺度的子带图像上进行基于局部区域特征的软阈值滤波。最后再进行小波重构，以提取图像的边缘。实验结果表明，该算法比其它算法提高了痕迹图像边缘的检测精度，是十分有效的。     

基于小波变换的多尺度图象边缘检测

边沿作为图像视觉的最主要特征 ,成为图像信息获取的重要内容 .而小波变换具有检测局域突变的能力 ,而且可以结合多尺度信息进行检测 ,因此成为图像信息边缘检测的优良工具 .基于信号与噪声在不同尺度下小波系数模的变化特征 ,利用小波变换系数模局部极大值来提取图像的边缘特征 .实验结果说明这种特征提取方法不仅有效地降低了噪声 ,而且也能较准确地提取图像的边缘及降低计算量 .     

基于小波变换的图像边缘检测

基于信号与噪声在不同尺度下小波系数模的变化特征,利用小波变换系数模局部极大值来提取图像的边缘特征.实验结果说明了这种特征提取方法能够较准确地提取图像的边缘并有效地降低噪声.     

一种基于小波变换的边缘检测方法

基于信号与噪声在不同尺度下小波变换系数模不同的变化特征,提出了一种边缘检测方法,该方法通过对图像的小波变换域中由噪声引起的小波变换系数模进行处理,再利用小波变换系数模局部极大值来提取图像的边缘特征,实验结果说明这种特征提取方法可以有效地降低噪声,同时又较准确地提取出图像的边缘。     

基于小波变换的人脸图象特征的边缘提取算法

人脸图象识别是模式识别、计算机视觉和人工智能领域的一个热点,而人脸图象的特征提取又是人脸图象识别的关键步骤.小波变换以其多分辨率分析和多通道分解的独特分析方法在图象处理领域中有着广泛的应用.文章利用二进小波变换多尺度的特性,结合一些常规的边缘提取算法,在人脸图象特征的边缘提取方面取得了令人满意的结果,实验表明是一种有效的人脸图象特征边缘提取算法.     

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