改进的主动形状模型在植物叶形分类上的应用

本文在继承主动形状模型以地标点序列表示对象形状轮廓,通过归一化序列间的统计关系来研究形状间的相似性和差异性,以及用识别率来体现识别效果这三个基本特征的同时,针对植物叶片识别的特点,对模型进行了改进：增加了独立参数和粗分类步骤,使叶片识别免受非形状分类因素的干扰;在归一化进程中分别应用覆盖面积半径和生物学参照点进行伸缩变换和旋转变换,使归一化更符合生物学特征;在分类时通过设置相似度阈值,强化了同类叶片的标准,从而减少了一些非同类的误归入事件的发生;最后设计了三组实验来研究各影响因素独立变化时对识别率的影响,同时引入了误差矩阵和相似度矩阵,分别来体现错分的事件的分布情况并揭示了产生错分的原因。经过这些改进,本文实现植物叶片图像的批量识别和分类,提供了一种查询错分分布的方法并指出提高识别率的研究方向。     

植物叶片图像边缘检测Canny/SUSAN算法比较

植物叶片图像的边缘检测是基于图像分析的植物叶片识别技术中的重要环节.图像边缘检测算法的合理选取与叶片识别的准确度紧密相关.运用Canny算法和SUSAN算法分别对10种具有典型叶形特征的植物叶片图像进行边缘检测,并作主观分析和客观评价.结果表明,植物叶片的叶形和叶脉特征对算法效果的影响较大,在实际应用中应考虑这2种算法对叶形的选择性.     

序列超声图像边缘检测与跟踪的改进Snake模型

提出了一种序列超声图像边缘检测与跟踪的离散动态模型.在基于动态规划的Snake模型中,引入目标边缘的形状信息改进了内部能量约束形式;充分利用序列图像相邻层间的灰度相关信息弥补了传统Snake模型中图像梯度能量对噪声敏感的不足.实验结果表明,改进的Snake模型仅需少量的用户交互就能快速、准确地从超声序列图像中检测、跟踪出目标物体的边缘,在医学图像分析中具有一定的实用价值.     

基于叶缘特征的植物图像分类检索

叶缘是植物属种识别分类可以参照的主要特征之一.与叶片形状特征相比,叶缘描述了尺度更细微的特征,对于弥补叶形识别特征的不足、以及从多尺度识别植物属种都有重要意义.在借鉴已有研究成果的基础上,设计了7个新的叶缘特征描述符、提出了以语义字典组织植物属种多层分类中的层间继承关系、以及通过叶节点成员相似性评估确定植物属种的技术框架和方法.通过分支结点描述符组合分类实验,证明了叶缘凸残差与叶局部面积比、右边长与左边长比对划分不同的非裂叶植物、以及划分不同的非全缘叶植物有效;叶缘凸残差均值等描述符对于划分不同的非全缘叶植物有效.通过多描述符组合的多层分类将30种非裂叶植物划分到多个叶节点,平均全局精度优于81.21%.而叶节点成员属种概率评估实验,进一步论证了这种多层分类和相似性检索框架的合理和有效性.     

应用于人脸识别的基于Candide-3特定人脸三维重建

针对不同的姿态对人脸识剐的影响,提出了一个基于Candide-3参数模型的特定人脸三维重建方法.该方法同时利用了主动形状模型和主动表观模型的优点,较好地提高了特定人脸三维重建的时间效率和准确程度.将该方法对输入的图像进行姿态校正之后再进行识别,极大提高了识别正确率.对CMU-PIE数据库中4种不同姿态集的识别结果表明了方法的有效性.     

差分特征融合改进的动态手势识别分类网络模型

通过卷积神经网络和长短期记忆网络进行多模型结合,实现动态手势识别分类建模,并使用数据增强算法增加数据的多样性,通过差分特征融合改进网络。7种动态手势动作识别分类的实验结果显示,使用数据增强算法增加数据的多样性后,结合模型的识别率最佳可提升286%;通过差分算法改进网络,序列间差分特征融合模型识别率达到8381%,维度差分特征融合模型识别率达到8762%。表明多模型结合可解决单一模型的局限性,处理更加复杂的动态手势分类问题,两种不同形式的差分特征融合改进都可提升动态手势动作的识别率,从而验证了所设计的差分特征融合改进的动态手势识别分类网络模型的有效性和可行性。     

一种改进的基于主动形状模型的人脸特征定位方法

主动形状模型是目前一种常用的人脸特征定位方法.针对传统的主动形状模型过度依赖模型初始参数的设置问题,提出了一种改进的基于主动形状模型的人脸特征定位方法.首先,通过样本学习得到输入新图像的灰度重构系数,并将这组系数用于人脸形状的重构,再由重构出的人脸形状得到主动形状模型的初始参数,然后通过不断调整模型参数减少模型与目标轮廓的距离误差,最后在数次迭代后达到模型与实际人脸特征轮廓的匹配.与基于传统主动形状模型的特征定位相比,改进的主动形状模型具有较高的准确性,能快速定位出各目标特征.     

基于隐马尔可夫模型的DNA序列识别

利用隐马尔可夫模型训练中不同结构的DNA序列的L值分布范围不同的特点,对传统多类投票模型进行改进,提出一种优于传统算法的快速训练算法,该算法只需训练出一类隐马尔可夫模型参数.对DNA内含子和外显子序列进行识别,平均识别率达到了90.8%.与支持向量机相比,隐马尔可夫模型在解决多分类问题方面具有优势,不但计算时间少,而且识别率高.     

基于改进EfficientNetV2网络的脑肿瘤分类方法

针对脑肿瘤磁共振图像分类问题中过拟合及分类准确率较低的问题,提出一种基于改进EfficientNetV2网络的脑肿瘤分类方法.该方法在EfficientNetV2网络中引入坐标注意力机制,该注意力机制将同时从垂直和水平两个方向获取脑肿瘤的特征信息,精准识别脑肿瘤的病灶特征,从而帮助模型更全面、准确地定位和识别病灶区域信息,有效抑制背景信息对检测结果的影响,使模型分类精度更高,解决了因获取特征信息不足导致分类精度低的问题.为进一步提升分类准确率,引入Hard-Swish激活函数,该激活函数不仅可以提升脑肿瘤分类网络模型的运算速度,也可有效提高分类精度.同时,改进后的模型搭配了Dropout层和归一化层,可更好抑制过拟合的发生,加快模型收敛速度,提高模型的鲁棒性,且分类精度有明显提升.实验结果表明,改进后的模型在验证集中获得了98.4%的分类准确率,通过对比实验和消融实验验证了改进后的模型在脑肿瘤分类任务中的有效性.     

课堂教学评估的多层次贝叶斯网络分类器方法

课堂教学是为实现一定的教学目标而展开的信息传递、过程控制和策略实施过程.依据课堂教学的特点给出了课堂教学评估的指标体系,并在此基础上建立了课堂教学评估的层次贝叶斯网络分类器模型.为提高分类器的分类识别准确率,在连续属性中引入形状参数,实验结果显示,通过形状参数的优化能够显著提高分类器的分类识别可靠性.     

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.     

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