基于图像变化检测的CFA插值算法

提出了基于变化检测的CFA插值算法.该算法分为两个步骤:首先采用矢量线性相关法对CFA图像的绿色分量图像进行变化检测,然后在发生变化的区域内进行插值,未发生变化区域内的图像数据被CFA插值后直接拷贝到当前帧的相应位置,避免了在每帧图像内逐点进行插值计算.与现有的插值算法相比,CFA插值算法复杂度大大降低,同时获得较高质量的视频图像.     

基于学习的彩色人脸图像超分辨率重构研究

提出了一种基于四元数模型的彩色人脸图像超分辨率重构算法.该算法利用主成分分析的主要思想,同时结合插值算法的理论,前期进行整体约束,后期进行分块处理,对人脸图像进行超分辨率重构.同时使用奇异值分解去除彩色图像中的噪声,针对主成分分析算法不太忠实于原图像的弱点进行改进;使用四元数表示彩色图像,将R,G,B三个分量同时进行处理.分析结果表明,该算法既利用了彩色分量的相关性,又提高了运算效率.     

基于贝尔模板的文本图像压缩及重构算法的研究

针对文本图像提出了直接对CFA原始数据进行压缩的算法,即首先把贝尔CFA图像从RGB色空间转换到YCrCb色空间,然后把不利于压缩的高频分量中比较多的亮度分量进行低通滤波,再用结构分离法把梅花形的亮度分量转化为矩形,最后分别采用JPEG2000压缩亮度和色度通道。为了估计解压恢复的CFA模板丢失的彩色分量,应用改进的自适应模糊匹配插值算法,对它周围四个相邻连接的像素分配一个模糊隶属度,从而利用相邻信息,且把这个隶属度作为加权平均工具来重构全彩图像。通过实验验证,这种贝尔数据直接压缩方法带来的失真很小,插值后恢复的全彩图像在主观视觉和客观质量评价中也能获得令人满意的效果。     

一种降低复杂度的CCD彩色图像重构算法

为了提高视频展台的图像质量和帧率,提出一种基于边缘检测的低复杂度插值方法。首先重构绿色分量图像,然后按照实验确定的阈值T划分图像平滑区域和边缘位置,分别对平滑部分、边缘位置进行双线性插值和Laplacian二阶校正项插值,来重构红、蓝色分量图像,最后对红蓝分量图像的平滑区域进行中值滤波以抑制伪彩失真。该算法与传统的两阶段图像重构算法相比,计算量显著降低,提高了图像重构实时性,并保持满意的图像质量,PSNR值达到33 dB以上。     

一种亚像元遥感图像的小波插值及滤波方法

该文分析了亚像元技术及相关的几种传统插值方法.针对传统插值方法拟合精度不高的缺点,提出了对两帧错半个像元的遥感图像进行小波插值与滤波的方法,即利用图像中已知点的全局信息对小波系数进行逐层估计.最后通过信息融合,将图像重构为一幅信息更丰富、分辨率更高的遥感图像.由于考虑到图像的全局信息,该算法对图像细节信息保持较好.实验结果证明了该算法优于传统方法,为采用亚像原成像技术提高航天遥感系统空间分辨率提供了一种图像融合重构的新方法.     

基于多小波的贝尔图像有损压缩研究

在评价贝尔图像压缩方法性能时,一般将图像压缩比、图像质量、算法的复杂程度、硬件实现难易程度等作为重要评价指标。以往使用的压缩方法中,插值后压缩机制采用国际标准算法,优点是能够获得较大的压缩比,但是它的复杂程度高,计算量大;直接压缩贝尔图像的优点是避免了在成像设备上使用复杂的插值算法,但是获得的压缩比较低。在实际应用场合,需要以较低的复杂程度对贝尔图像直接压缩,并在保证重构图像质量的同时,获得较高的压缩比。为此,本文提出基于多小波变换的贝尔图像有损压缩算法。     

自然光图像反射分量分离

针对传统方法不能直接去除自然光图像高光的问题,提出了一种基于多通道梯度一致性的反射分量分离方法.首先依据多通道梯度一致性检测同质高光像素、并构建反射分量分离张量.然后用反射分量分离张量对图像梯度进行变换,将其分解为镜面反射分量梯度和漫反射分量梯度.最后从漫反射分量梯度重构出估计的漫反射分量.实验结果表明该算法可直接去除自然光图像高光而不需预先估计光源色度,简化了自然光图像反射分量分离过程,并能更准确地去除归一化图像的高光.     

基于梯度局部一致性的自适应Bayer模式彩色图像恢复算法

基于图像局部梯度具有明显一致性先验,提出了一种基于梯度局部一致性的自适应Bayer模式彩色图像恢复算法。算法在恢复绿色通道时首先从垂直和水平两个方向的进行插值,得到候选插值结果。然后根据彩色通道结构相似的特点,提出利用多通道梯度线性加权估计图像局部梯度,并利用引导滤波实现用时域图像边缘结构对图像局部梯度进行一致化校验,从而提高边缘估计的精度。然后将一致化校验后的梯度特征与候选插值进行自适应融合得到最终绿色通道插值。最后依据图像通道之间的结构相似性先验,利用绿色通道结构细节实现对红色和蓝色通道重构图像的修正,从而恢复完整的去马赛克彩色图像。通过在Kodak和IMAX两个数据库进行的有效性验证,并与其他最新方法进行的性能对比,结果表明恢复图像主观视觉特性和客观评价指标都优于传统方法。此外,由于不涉及迭代和网络训练,具有高效性。     

自适应比例合成反马赛克算法的提出与应用

为解决实际应用中的反马赛克问题,给出一种自适应比例合成算法.对G通道进行梯度比例合成插值,R,B通道采用G通道的梯度校正双线性插值结果,从复合峰值信噪比(CPSNR)和计算量两个角度,将自适应比例合成算法与其它几种典型的反马赛克插值算法进行对比.自适应比例合成算法以较小的计算量获得较高的CPSNR,适合于实际应用.该算法已应用在某多通道CMOS图像采集系统中,效果理想.     

基于图割和Sobel算子的视频分割算法

针对前景和背景交界处对比度较低的图像分割问题,提出了基于图割和Sobel算子的视频分割算法.首先建立包括颜色分量和对比度分量的能量函数;然后对当前帧和背景求梯度,使用背景的像素梯度来减弱当前帧中背景部分强边缘的梯度值,同时对由颜色模型建立的图像进行Sobel边缘检测,将得到的边缘检测的结果应用到颜色分量和对比度分量中来增加前景和背景对比度;最后,使用图割算法,对能量函数进行最小化求解最终得到分割结果.实验结果表明,当前景和背景交界处颜色相近时,本文分割算法能有效降低分割错误率.     

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