高噪声率椒盐噪声污染图像滤波

针对高噪声率椒盐噪声污染的数字图像,改进了基于灰色绝对关联度的像素类型判别,可识别出离散噪声(或边缘点)、聚集噪声与非边缘点。对于离散噪声(或边缘点),采用自适应中值滤波算法进行平滑,兼顾噪声滤除和细节保存。对于聚集噪声,在去除邻域内噪声点后取剩余像素均值作为滤波结果;而对于非边缘点则直接保留。实验结果表明,滤波算法对于高噪声率椒盐噪声具有良好的滤波效果,还能较为有效地保留图像细节。     

基于噪声检测的彩色图像滤波算法

对于被脉冲噪声污染的彩色图像,提出了基于噪声检测的彩色图像滤波算法。运用脉冲噪声检测器,估计出图像中的噪声像素,应用后续滤波算法,只对检测出来的噪声像素进行滤波,而对非噪声像素(即信号像素)保持其值不变。并对基于相似度的自适应滤波算法加以改进,作为后续的滤波算法。实验结果表明,提出的滤波算法与传统滤波算法相比,在有效消除噪声的同时,更能够保留图像中的边缘和细节特征。     

一种新的自适应加权矢量方向距离滤波器

针对已有的的矢量滤波器不能自适应地确定滤波器窗口内像素之间的空间距离对滤波效果的影响等问题,提出一种新的自适应加权矢量方向距离滤波器。该滤波器将彩色像素当作1个三维矢量,结合有序统计方法,利用彩色矢量问的距离信息和方向信息,并通过捕食者一食饵微粒群算法优化获得滤波器窗口的最优权值,体现滤波器窗口内像素之间的空间距离对滤波效果的影响,实现彩色图像的自适应滤波。与其他滤波算法的性能相比以及仿真结果表明,采用所提出的算法得到的平均绝对误差、均方误差和归一化的色度误差等明显比现有的彩色图像滤波方法的低,能在去噪与图像的细节及边缘保护方面达到平衡。     

一种基于模糊逻辑的图像自适应去噪算法

为克服单一使用中值滤波方法去除脉冲噪声会造成图像细节信息丢失,使图像变模糊的缺陷,提出一种新的基于模糊逻辑的图像自适应去噪算法.新算法通过分析像素不同方向邻域像素灰度值分布情况来检测脉冲噪声点,另外为更好地保持图像边缘等细节特征,使用改进MMEM(maximum-minimum exclusive median)算法对噪声像素点的灰度值进行估计.最后,新算法通过引入模糊逻辑规则,更加合理地进行噪声污染像素点的灰度值复原.仿真结果表明,与其他改进中值滤波算法相比新算法在去除脉冲噪声时能取得更好的效果.     

基于CIELab颜色空间的矢量彩色图像放大算法

提出了一种基于CIELab颜色空间和矢量滤波器的彩色图像放大算法.该算法利用彩色图像各颜色通道的固有相关性,在CIELab颜色空间中利用矢量滤波器将彩色像素作为矢量集合进行处理,首先将彩色图像从RGB空间转换为CIELab颜色空间,然后在CIELab颜色空间利用矢量滤波器进行空间插值,最后将插值后的图像从CIELab空间转换为RGB颜色空间,得到放大后的彩色图像,保持了彩色图像的空间和频率特性.实验结果表明该算法优于传统算法.     

基于Alpha稳定分布模型的彩色图像边缘检测新算法

 在彩色图像的边缘检测中,如何去掉噪声的干扰及怎样更精确的检测出边缘是图像处理中一个非常重要的问题。本文提出了一种去除脉冲噪声干扰的彩色图像的边缘检测算法。首先,提出一种基于Alpha稳定分布模型的图像去噪算法。其次,利用改进的各向同性边缘检测器和快速熵阈值技术自动确定图像边界,并考虑了像素与其邻域像素的颜色距离进一步精确定位图像的边缘。实验证明,该算法能够克服脉冲噪声的影响,较精确的检测出彩色图像的边缘。     

基于自适应中值滤波器和TV修复的椒盐噪声去除

提出一种两步式椒盐噪声去除方法．第一步利用自适应中值滤波器来识别出被噪声污染的候选点;第二步利用一种边缘保持技术（全变差图像修复）来恢复出被噪声污染的点．由于椒盐噪声点的灰度值和原始像素灰度独立,所以在采用恢复技术时不使用噪声点自身的灰度信息．在噪声率不很高的情况下,这种方法可以获得比现有最好方法更高的信噪比;当噪声率高达70％以上时,该方法的信噪比与现有方法非常接近,但是主观视觉效果（例如边缘保持能力）更佳．     

一种基于粗集的彩色图像边界噪声迭代滤除方法

边界噪声的处理在图像去噪中占有重要位置,该文提出了一种图像边界噪声处理方法.该方法将边界噪声和内部噪声分开处理,降低了二者在处理过程中的相互影响.文中将粗集和矢量DDF(Directional Distance Filter)滤波相结合,首先对图像中除边界以外的内部噪声,以迭代的形式进行滤除.由于在内部像素滤除之前已对边界像素进行了检测,因此边界噪声不会作为内部滤波器的输入像素,有效地避免了边界噪声的传播.待内部噪声完全滤除后,再取特定的窗口对边界噪声进行滤除.因为粗集与矢量DDF滤波的结合在噪声滤除率、颜色保持、细节保护各方面都有优势,使得内部噪声像素去除效果比较好,不会影响到边界噪声的去除.仿真实验表明该方法能有效滤除边界噪声.     

一种去除灰度及彩色图像椒盐噪声的新方法

 提出了一种新的用于去除灰度、彩色图像椒盐噪声的方法.首先,通过简单而有效的检测识别可能的噪声像素.然后,用其邻近非噪声像素替换识别出的噪声像素.实验结果表明此方法在去除噪声,保护细节方面优于传统的算法和近年来提出的改进算法.     

一种彩色图像的自适应混合滤波

设计了一种彩色图像的自适应混合滤波方法.该方法先判断窗口内含噪类型,然后用矢量加权均值滤波抑制高斯噪声,用矢量加权中值滤波抑制脉冲噪声,其权值均由滤波窗口内像素与窗口中心像素的距离得到.该混合滤波算法能够自适应地选择滤波方式,提高了滤波性能.     

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.     

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     

Call for Papers

<正>"The Journal of Shanghai Normal University:Mathematics"is published by Shanghai Normal University as regular issues of The Journal of Shanghai Normal University each year from 2014 in English.The editors-in-chief of the issues are professors Yuhao Cong and Maoan Han.The Journal of Shanghai Normal University was started in 1958 with     

Journal of Donghua University ( English Edition) Contents of Volume 31

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