基于HSV色彩空间和Otsu算法的无人机影像植被覆盖度自动提取

随着无人机遥感技术的不断发展和普及,其在生态学等领域中的应用已成为当前研究热点。植被覆盖度信息提取是无人机遥感的重要应用领域之一,然而目前无人机影像的植被覆盖度提取存在阈值难以选取、耗费时间过长等问题。为提高植被覆盖度提取的精度和速度,本文提出一种基于HSV色彩空间与Otsu算法的图像分割方法。该方法将无人机影像进行色彩空间变换,在HSV色彩空间中提取H分量并结合Otsu阈值分割方法,全程快速自动地完成植被覆盖度提取。实验结果表明,Otsu算法能显著缩短植被覆盖度提取时间,且提取精度较高,并且在结合HSV色彩空间时,准确度更高,对比传统植被覆盖度阈值提取有较为明显的优势,提高了植被覆盖度提取的时效性。     

基于改进3D-PCNN的中药材彩色显微图像分割

为有效提取中药材彩色显微图像的目标信息,提出了一种基于改进三维脉冲耦合神经网络的图像自动分割方法.首先,从适合处理中药材彩色显微图像的角度出发,对传统模型进行简化与改进;其次,采用RGB颜色空间,利用最大信息熵选择性排列图像,并将结果作为改进模型的输入,进而完成图像分割;最后,用最大综合判定准则选取最佳分割结果,并与最大香农熵、最小交叉熵、色差对比度进行比较.实验结果表明,本文方法可以精确自动地分割中药材彩色显微图像,克服了最大香农熵、最小交叉熵、色差对比度的缺点,分割效率明显优于传统方法.     

彩色航空影像中的建筑物阴影提取

在彩色航空影像中,建筑物阴影能提供大量关于建筑物形状、位置等相关信息。提出了一种基于特性的自动提取建筑物阴影的方法,以获取彩色航空影像中建筑物阴影的形状信息。利用可分离亮度和色调的颜色模型（包括HSV、YIQ、YCbCr颜色模型）提取彩色航空影像中的建筑物阴影,并利用数学形态学处理阴影分割图像。试验结果表明该方法是行之有效的。     

基于灰度迭代阈值的高分辨率影像分割研究

图像分割技术为遥感图像解译和分类的一种重要方法,目前主要应用在中分辨率影像中,由于高分辨率影像的信噪比低,直接进行图像分割,效果不佳．对2010年3月湖北省襄阳市高分辨率的快鸟影像,进行降噪处理及改进阈值策略来改善灰度迭代阈值法的图像分割效果．首先运用数学形态学的闭运算对影像进行降噪处理,然后采用灰度迭代阈值法和最大类问方差法的图像分割对影像进行分割对比研究．结果表明,灰度迭代阈值法在时间效率及影像分割效果方面优于最大类间方差法．     

顾及梯度和彩色信息的高分辨率影像道路分割

针对高分辨率影像中道路灰度值分布不均,“同谱异物”现象难以用简单阈值分割,以及对不同传感器、不同分辨率影像提取效果不一样等问题,提出了一种顾及空间梯度信息和彩色信息的道路阈值分割方法。利用高分辨率影像的多种特征,将梯度值和灰度值进行     

基于自动多种子区域生长的遥感影像面向对象分割方法

在遥感影像分割分类中,种子区域生长算法是一种常见的分割算法.传统的种子区域生长算法只能提取单一连续的、纹理简单的目标地物,而对具有复杂纹理和多光谱特征的遥感影像,分割时存在分割效果差、不能同时有效地提取多个地物的问题.针对以上问题,本文提出了一种改进的面向对象的自动多种子区域生长算法.该方法适用于同时提取多个目标地物,且分割效果好.该方法首先使用一种改进的中值滤波对影像进行平滑处理,使目标内部一致性更高,同时保留纹理信息.然后通过一定的准则进行自动种子选取并进行生长,最后对生长后的区域进行碎斑合并处理,最终得到多种对象的分割结果.本文采用三组不同大小的1m空间分辨率的航空影像进行实验,通过与分水岭以及传统单种子区域生长算法的多组实验对比,发现该方法可以面向全局对象,自动选取覆盖各种地物类型的种子,同时对多种地物目标进行分割处理,可为后续面向对象影像分析和应用提供可靠的数据基础.     

淋巴细胞自动阈值分割算法的研究

本文根据淋巴细胞的彩色特征,结合临床病理专家的先验知识,提出了基于RGB彩色空间和HSI彩色空间的淋巴细胞自动闽值分割算法。采用基于最小二乘法的曲线拟合的算法分别在两彩色空间中进行直方图曲线拟合,求出分割阈值序列,并定义评价函数,从中选取最优阈值,从而实现淋巴细胞的细胞核与细胞浆的分割。实验证明,该方法可以取得较好的分割效果。     

基于粗糙熵和K-均值聚类算法的图像分割

针对基于粗糙熵的图像分割算法不能满足复杂图像的多类目标提取的需要,本文先利用K-均值聚类算法对图像进行区域分割,再利用基于粗糙熵的方法对分割结果进行目标提取,从而达到多阈值分割的目的。通过对遥感图像进行分割处理,证明了改进后算法的有效性。     

一种基于白帽变换的细小水体信息提取方法

提出一种基于形态学白帽变换的线性特征增强处理技术,从而有效提取遥感影像中的细小水体信息.通过白帽变换对改进的归一化差异水体指数(MNDWI)影像进行线性特征增强处理,获取形态学细小水体指数(MNWI)特征影像,并采用经验阈值和自动阈值相结合的方式实现水体样本信息双阈值分割提取,解决细小水体与线状道路容易混淆的问题.利用多幅Landsat影像测试本文方法,结果表明,本文方法能较好地提取细小水体信息,较好地保持细小河道形态的连续性,细小水体提取精度达到80%以上.     

无人机复垦区植被覆盖度提取方法优选

为探寻无人机遥感对矿业复垦区域植被指数覆盖度的快速提取方法,以四川古蔺某硫磺复垦区为研究对象,通过ZC-6型无人机获取高分辨率遥感影像,采用多种植被指数计算方法作为分类器的选择,使用直方图峰谷法、基本全局阈值法及其融合方法确定图像最佳分割阈值,从而获取研究区植被覆盖度结果.结果表明:不同植被指数分类后的结果有所差异,EXG和VDVI植被指数分类后影像界定较为清晰,而NGBDI指数分类最为模糊;单一直方图峰谷法和基本全局阈值法所得分割结果不理想,而将二者融合后的阈值确定法能结合彼此的优势,弥补灰度不明显或多峰现象的缺点;植被覆盖度(FVC)提取精度显示,基于VDVI提取的人为干预条件下FVC的绝对误差和提取误差分别达到0.0409和7.05％,而基于EXG提取的自然条件下FVC的绝对误差和提取误差分别达到0.0366和6.94％,表明利用VDVI和EXG结合B-H融合的方法可有效用于复垦区条件下的FVC提取.     

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.     

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.     

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.     

Characterization of Ordovician carbonate reservoirs, southeastern Saskatchewan, Canada

The discovery of the prolific Ordovician Red River reservoirs in 1995 in southeastern Saskatchewan was the catalyst for extensive exploration activity which resulted in the discovery of more than 15 new Red River pools. The best yields of Red River production to date have been from dolomite reservoirs. Understanding the processes of dolomitization is, therefore, crucial for the prediction of the connectivity, spatial distribution and heterogeneity of dolomite reservoirs.The Red River reservoirs in the Midale area consist of 3～4 thin dolomitized zones, with a total thickness of about 20 m, which occur at the top of the Yeoman Formation. Two types of replacement dolomite were recognized in the Red River reservoir: dolomitized burrow infills and dolomitized host matrix. The spatial distribution of dolomite suggests that burrowing organisms played an important role in facilitating the fluid flow in the backfilled sediments. This resulted in penecontemporaneous dolomitization of burrow infills by normal seawater. The dolomite in the host matrix is interpreted as having occurred at shallow burial by evaporitic seawater during precipitation of Lake Almar anhydrite that immediately overlies the Yeoman Formation. However, the low δ18O values of dolomited burrow infills (-5.9‰～ -7.8‰, PDB) and matrix dolomites (-6.6‰～ -8.1‰, avg. -7.4‰ PDB) compared to the estimated values for the late Ordovician marine dolomite could be attributed to modification and alteration of dolomite at higher temperatures during deeper burial, which could also be responsible for its 87Sr/86Sr ratios (0.7084～0.7088) that are higher than suggested for the late Ordovician seawaters (0.7078～0.7080). The trace amounts of saddle dolomite cement in the Red River carbonates are probably related to "cannibalization" of earlier replacement dolomite during the chemical compaction.     

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.     

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.     

橡胶颗粒沥青混合料低温抗裂性试验研究

以AC-13级配为基础,将橡胶颗粒代替部分集料掺入混合料中,以低温弯曲试验为评价方法对不同橡胶颗粒掺量下沥青混合料的低温抗裂性进行研究,并引入应变能密度值对混合料的低温抗裂性进行综合评价.试验结果表明:橡胶颗粒沥青混合料试件的破坏微应变均超过2 300,满足冬寒区的技术指标;无论是否掺加橡胶颗粒,随着温度的下降,沥青混合料破坏时的最大弯拉强度增大,弯拉应变降低,劲度模量增大;弯曲应变能密度在胶粒掺量为1%左右时具有较大的弯曲应变能密度值,此时橡胶颗粒沥青混合料具有较好的低温抗裂性.     

A computer generator for randomly layered structures

AcomputergeneratorforrandomlylayeredstructuresYUJia shun1,2,HEZhen hua2(1.TheInstituteofGeologicalandNuclearSciences,NewZealand;2.StateKeyLaboratoryofOilandGasReservoirGeologyandExploitation,ChengduUniversityofTechnology,China)Abstract:Analgorithmisintrod…     

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.