基于版式边缘增强算法的倾斜检测

该文针对数字化文档图像的倾斜现象,首先定义了多种变换算子,然后在倾斜检测中,利用这些算子对预处理后的二值化倾斜图像进行变换处理.所得到的变换图像淡化了原文档图像的内部细节特征,同时清晰地反映了原图像版面边界的走势.变换图像通过一个图像块的形式直接表征了原版面的边界信息,增强了版式边缘,使得文档图像的倾斜角度更易检测.最后通过选取有代表性的倾斜版面图像,对该算法进行了实验验证分析,得到了版面倾斜检测的统计结果.     

文档图像分割技术研究

在文档图像分析处理中,分割技术十分必要.本文介绍了目前文档图像分割算法中常用的特征和方式,并对针中文文档图像给出了一种分割方法.该方法首先利用Sobel算子粗略检测出文字边缘区域,利用形态学膨胀方法扩展该区域,接着进行了两次颜色聚类分析,最后根据中文字符的特征进行了一系列启发式处理,很好地分割出了文字区域.     

一种基于消失点和颜色过滤器的车道线检测算法

针对经典霍夫车道线检测方法实用性较差,无法准确区分车道线和路沿与应用道路场景简单等问题,提出 了一种基于消失点和颜色过滤器的车道线检测算法,不仅提高车道线检测的准确率,而且能够应用较复杂行车场 景;首先,对行车视频连续五帧图像进行预处理,获取行车环境下车道线消失点位置,能够自适应选取行车环境图 像的感兴趣区域(Region of Interest,ROI);然后,对 ROI 图像根据车道线颜色特征进行过滤得到二值图像,获取二 值图像中所有连通区域质心和倾斜角等数据,通过结合消失点特征和角度阈值进行限制,筛选记录符合车道线特 征连通区域的数据,接着分割较大区域获取更多质心点,识别漏检符合车道线特征的区域质心点;最后,对获取的 质心点使用最小二乘法进行拟合并标识车道线;实验结果表明:算法能够在多场景道路上快速准确的检测出车道线,与经典霍夫算法进行仿真比较,算法具有一定的鲁棒性和实时性。     

一个改进的车牌号码倾斜校正方法

在智能交通系统中,车牌号码倾斜校正是预处理的重要步骤．论文使用加权最小二乘法,把车牌区域拟合成一条直线,然后求得该直线斜率,并计算倾斜车牌图像的倾斜角％最后把图像旋转一Ⅸ完成倾斜校正．实验结果表明：论文方法能快速准确地检测出图像的倾斜角,并具有较强的适应性．与最小二乘法拟合直线比较,倾斜角精度更高,目标函数值更少;与Hough变换校正相比较,论文算法处理时间更短,倾斜角测量精度更高．     

基于Hough变换的指针仪表读数识别方法

针对广州市宇泰仪表电器有限公司85C1系列仪表的读数识别问题,提出一种基于Hough变换的图像处理方法.该方法采用彩色相机拍摄仪表图像.首先,通过指针的红色特征提取图像中的指针样本点,并应用最小二乘法获取指针的直线方程;其次,由表盘上的圆弧特征之圆心位于指针直线上的假设,利用Hough变换的原理提取出表盘上的圆弧特征;最后,通过图像变换将刻度部分的圆弧线变换成直线,实现了刻度线两端点位置的提取,并完成仪表读数识别.实验表明,该方法能够准确识别仪表读数,具有较高的鲁棒性.     

基于射影不变性的单幅图像测量

设计了一种由正方形及其内切圆组成新的平面模板,在此基础上提出了一种基于射影不变性的单幅图像测量方法。在该方法中,首先利用Canny算子检测出空间平面和平面模板的图像中直线和椭圆的特征;然后运用最小二乘法拟合出直线和椭圆的方程,从而可以得到直线与椭圆的切点;根据射影几何中直线和点的结合性保持不变的性质,得到空间平面上的点与图像特征点间的对应,从而估计出空间平面与图像平面之间的单应矩阵;最后,由单应矩阵实现了对空间平面上任意两点距离的测量。模拟实验和真实图像实验说明本文的方法是可行的。     

人民币纸币冠字号码字符识别方法研究

以倾斜校正算法和模式识别算法2项核心技术为目标,充分利用霍夫变换法和最小二乘法在直线检测中的优点,采用一种结合霍夫变换法和最小二乘法的直线检测算法来求得人民币纸币图像的边缘直线及边缘直线的倾斜角度参数,并采用图像旋转变换算法实现对原倾斜人民币图像的倾斜校正.采用Hopfield神经网络的联想记忆功能,缩小待识模式与标准模板的差异,再用模板匹配法对Hop field神经网络的输出结果进行识别,得到最终的识别结果.实验证明,结合Hopfield神经网络和模板匹配法的人民币冠字号码识别方法具备较高的识别率.     

一种文本图像倾斜校正的方法

文档图像倾斜检测与校正是文档分析的预处理的重要环节.提出了一种基于像素点的方法来检测文档图像的倾斜问题,并通过迭代运算来准确的实现倾斜文档图像的校正.实验结果表明,本算法速度快,精确度高,具有较强的实用性.     

基于回归分析的基因芯片图像倾斜校正方法

基因芯片图像的倾斜校正对图像分析有着重要意义。利用投影信号对图像进行行列分割,对仅包括单行（列）样点的子图像运用回归分析完成初步倾斜校正,利用样点的质心进行直线拟合,完成精确校正。实验表明,对基因芯片图像的倾斜校正有很高的准确性,且算法简单易行。     

基于数学形态学的文档图像段落标记及其应用

随着信息采集技术的发展,文档图像在信息的数字化管理中越来越重要,针对文档图像,本文就文字段落的智能识别进行了研究,给出了段落特征点检测的算法,最后给出了段落检测的一个实际应用.实验表明,本文提出的算法可以有效对段落的特征点进行标记,且具有很强的鲁棒性.     

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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