示温漆色彩量化及其图像分割算法研究

提出了一种基于颜色聚类和区域特征相结合的示温漆图像分割算法。利用PGF滤波算法进行图像的噪声滤波,通过聚类算法在HSV颜色空间对示温漆图像进行色彩量化,最后利用区域增长和合并方法达到分割目的。实验结果表明,与其它针对自然真彩图像分割的算法相比,本算法的计算复杂度相对较小,对示温漆图像分割的效果良好。     

基于云理论的图像分割新方法

针对区域生长算法的种子点初始化和生长准则问题,提出了一种基于云模型和区域生长的图像分割方法.该方法首先利用云变换对图像进行变换生成云模型,然后利用云模型的Ex作为区域生长的种子点,以云的极大判定法则作为区域生长准则进行区域生长,获得最终的分割结果.这种分割方法不但克服了区域生长法种子点和生长准则选取不当而产生过分割和欠分割的不足,而且很大地提高了云模型分割图片的速度,实验结果证明,该方法可以准确地分割出目标,是一种有效的图像分割方法.     

基于区域过划分和再融合的全幅视觉图像分割

研究对移动机器人采集的视觉图像进行全局精确分割问题. 针对全幅道路图像分割问题提出:首先利用区域生长算法对视觉图像在HSV颜色空间下进行基于颜色特征的全局过分割,再利用傅里叶变换提取周向谱纹理特征,根据空间位置的相邻性和周向谱的分布特性,对过分割的全幅视觉图像进行基于纹理特征的再融合. 实验结果表明,该算法能够准确实现全幅图像的分割,比单纯利用颜色或纹理特征进行全幅图像分割具有更高的精度和可靠性.     

基于机器视觉的颗粒识别计数

针对检测种子千粒重时种子图像在不同光照条件下的分割问题,研究了RGB空间以及HSV空间的颜色特征,并对其进行了分析对比,然后引入像素灰度级和邻域灰度级构成的二维直方图,提出了一种基于种子色调特征的自动分割算法。由于基于二维直方图的分割算法增加了各个像素点的邻域信息,从而增强了抗干扰能力,提高了分割的准确性,进而再结合极限腐蚀的方法实现对种子的计数。实验结果表明:采用本文的算法可对不同光照强度下的种子图像进行有效的分割及识别计数。     

类人足球机器人彩色目标识别与头部视觉跟踪

为了在机器人足球比赛中能够快速准确地跟踪运动目标,提出了一种颜色识别与头部视觉跟踪相结合的方法.利用HSV色彩空间颜色阈值的判别和种子点区域生长的填充算法识别物体,计算物体质心并判断其位置,然后通过舵机控制机器人头部的转动跟踪目标.实验结果表明,该方法具有较高的跟踪速度与准确性.     

融合云模型和比重阈值的唐卡破损区域分割

针对唐卡破损区域分割问题,提出了融合云模型和比重阈值提取破损区域的算法。首先获取RGB彩色图像的灰度图、HSV空间的V分量、YIQ空间的Y分量、LUV空间的L分量,合并这四个分量得到融合图像;其次利用云模型过滤融合图像,得到云过滤图像;然后计算云过滤图像的比重度并进行局部比重阈值分割,得到分割结果 1;再分块粗分割融合图像得到分割结果 2和分割结果 3;最后合并分割结果 1、2和3得到分割结果 4,对分割结果 4去除过分割区域,得到最终分割结果。实验结果表明,与一维最大熵法、OTSU算法、数字形态学算法等算法相比,该算法的分割效果较好并具有一定的稳定性。     

基于HSV颜色空间的视频镜头检测

为了克服光线变化和运动对视频镜头检测的影响,本文提出了一种新的视频镜头检测算法.该算法把视频图像从RGB颜色空间映射到HSV颜色空间.再重新量化图像的H与S分量到127个色度区域,最后通过比较帧间图像在色度区域的重叠程度来检测镜头的变化.同时采取有效的虚假镜头分割分析机制以减少图像快速变化的影响.实验结果表明,本算法具有较高的准确率和查全率,并且有较快的处理速度,在视频镜头分割检测领域具有一定的实用价值.     

基于纹理和邻域信息的肤色分割算法

为有效分割图像中的肤色信息,提出一种基于纹理和肤色点的邻域信息肤色分割算法.首先,根据图像中的肤色点在RGB颜色空间上的分布规律,利用统计直方图模型对肤色部分进行初步分割;其次,为提取图像中的纹理信息,采用Gabor滤波器进一步过滤掉与人类皮肤颜色接近但纹理粗糙的区域;最后,采用掩码图像中的肤色点作为种子点进行邻域信息的扩散,得到最终掩码图像.实验结果表明,与统计直方图肤色模型相比,该方法肤色分割效果更好.     

人脸检测的自适应肤色分割算法研究

为寻找候选人脸区域,从复杂的背景中分割出肤色信息成为一种有效的方式。作者分析了几种常用的彩色空间,提出一种自适应肤色分割算法,即检测出彩色图像中的肤色区域。算法选择了分割效果很好的HSV彩色空间,对Sandeep等人提出的方法进行改进,克服了因为皮肤区域的颜色随着拍摄的光照、角度等因素难于分割的不足。实验结果表明,该算法能有效地从复杂背景中分割出肤色区域,显示出更强的鲁棒性(robust),在人脸检测系统中具有很好的应用价值。     

非结构环境下一种改进的区域生长点云分割方法

针对非结构环境下目标零件识别过程中零件相互堆叠造成分割困难的问题,提出了一种改进的区域生长点云分割算法。首先,采用直通和统计滤波器对获取的点云进行预处理,得到去除冗余数据后的点云;其次,使用八叉树建立点云之间的拓扑关系,提高后续点云分割的效率;最后,选择基于局部径向基函数的曲率计算方法,通过计算选取曲率最小点为初始种子点,并设定空间阈值范围进行区域生长。实验结果表明:该方法能有效解决非结构环境下零件堆叠导致的分割困难问题,分割准确度高且效率满足工业实时需求。     

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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