共查询到20条相似文献，搜索用时 421 毫秒
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探讨利用分割和纹理分类技术提取农田信息．利用多分辨率分割快鸟影像4个波段,再对分割所生成的影像目标进行纹理分类．利用自相关函数确定纹理窗口的大小为5×5像元,分类所采用的纹理包括同质度、对比度、不相似度．结果表明该方法分类出的6种农田地物正确分类率在0．918到0．852之间． 相似文献
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处理无人机影像数据时,Harris角点检测算法具有较强的鲁棒性和稳定性。使用Harris角点检测算法时,影像边界处由于影像畸变影响,生成的特征点存在角点聚簇和伪角点的概率非常大,在处理该类问题时,通常是删除影像边界生成的角点。针对影像边缘特征点删除量的合理性进行了实验：先对影像生成特征点面积进行限制,用Harris算法提取特征点。然后用非极大抑制算法选取特征点,去除伪角点和聚簇的角点,生成最佳缝合线进行影像匹配融合。最后对比影像生成特征点面积和最后影像匹配效果,论证影像边缘删除Harris角点的合理量。实验结果表明,相对于传统的直接删除边界Harris角点方法,该方法更可靠更精确。 相似文献
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孙小芳 《闽西职业技术学院学报》2009,11(4):117-120
利用多分辨率分割快鸟影像4个波段,再对分割所生成的影像目标进行分层知识分类。分类所用到的知识包括光谱、纹理、几何、空间、逻辑关系。利用模糊隶属函数表明目标属于8种地物的可能性。结果表明,该方法比基于像元的分类方法效果更优。 相似文献
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黄皖毅 《广东广播电视大学学报》2010,19(4):106-109
遥感技术为人们提供了大量的图像数据,如何从中提取所需信息,是遥感图像处理技术研究的热点。基于多尺度小波变换,可提取城市图像的纹理特征。根据城市影像中地物特征和小波技术的特点,确定合适的窗口大小,采用逐一滑动窗口的方法,对每一窗口提取相应的小波统计特征;应用小波变换的多尺度特性,在不同尺度上提取出子图像特征,构造出纹理特征矢量,为遥感图像的分类提供纹理特征。 相似文献
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针对Geoeye,QuickBird等高空间分辨率遥感影像变化检测精度不高的问题,本文研究了面向对象的分类后比较的变化检测方法。该方法是先利用均值平移法进行图像分割,再以分割对象为基本单元,采用支持向量杌分类器进行分类,最后识别变化区域。该方法充分考虑了影像中地物的光谱、几何、上下文特征,以及目标间的拓扑关系,以弥补基于像素的变化检测方法的不足。最后,用QuickBird多时相影像作为测试数据,验证了本方法能有效提高高分辨率遥感影像变化检测的精度,且有利于GIS数据更新。 相似文献
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将高分辨率遥感图像进行像素级海陆分割是遥感应用领域的一项基础性工作,对海岸线提取和海洋近岸目标检测具有重要意义,但传统阈值方法往往由于高分辨率遥感图像覆盖范围广、地物纹理复杂等特点而难以取得预期效果。为了提升高分辨率遥感影像海陆分割精度,改善传统阈值方法的不足,基于深度神经网络模型利用编码器—解码器架构,并在编码层中引入残差块,以更好地对特征图进行高级语义信息提取,通过解码层将编码层生成的特征图还原成与输入尺寸相同的特征图,最后通过Sigmoid层对图像进行像素级海陆分割。在高分辨率遥感图像数据集上的实验结果表明,该网络模型取得良好了分割效果,准确率和Kappa系数分别达到了94.3%和93.7%。与传统方法相比,海陆分割精确度得到了有效提升。 相似文献
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点云模型区域分割是其数字处理的基础工作。在分析用户交互式边界顶点选取方法基础上,提出一种基于自动生成边界曲线的分割算法。根据点法式方程求解边界点的剖切平面,据此将点云模型分为两部分。实验表明,与适当的用户界面配合,算法可有效实现点云模型的特征区域交互式分割操作,为点云模型参数化及模型编辑等提供支持。 相似文献
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《绵阳师范学院学报》2015,(11):90-94
面对耕地面积日益锐减,耕地矛盾日益突出的形势,准确快速的提取遥感影像中的耕地信息已成为耕地动态监测的基础.本研究以绵阳市某县0.5 m分辨率的航空影像为实验数据,借助RS和GIS技术,采用共生矩阵分析航空影像纹理特征,在此纹理影像上运用最大似然监督分类方法对耕地信息进行了自动提取.实验结果表明:耕地信息提取正确率大于90%,kappa系数大于0.81.该方法提取速度快,自动化程度高,精度好,能够有效利用地物的空间分布信息和结构信息. 相似文献
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罗艳萍 《读与写:教育教学刊》2008,5(6)
The communication of people partially is the communication of cultures. Culture has a direct effect on international commercial activities in all aspects. Different conceptions about time, space, equality, law and the like, lead people to deal with things in different ways. So to know cultures of the counterpart is to facil-itate our enterprises so as to have a smooth and successful communication in commercial activity. 相似文献
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Richard Denner 《海外英语》2007,(4):14-15
Rosco and I wait for the fishermen to return.I sit at a wooden bench near the store at Mt.Baker Resort and watch the clouds change shape. Rosco has my belt around his neck and an eight foot tow chain hooked to a tree. Dogs must be on a leash. Ducks and rabbits are loose. 相似文献
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Given a graph G,a subgraph C is called a clique of G if C is a complete subgraph of G maximal under inclusion and |C|≥2. A clique-transversal set S of G is a set of vertices of G such that S meets all cliques of G. The clique-transversal number, denoted as TC (G), is the minimum cardinality of a clique-transversal set in G. The clique-graph of G, denoted as K (G), is the graph obtained by taking the cliques of G as vertices, and two vertices are adjacent if and only if the corresponding cliques in G have nonempty intersection. Let F be a class of graphs G such that F={G|K(G) is a tree}. In this paper the graphs in F having independent clique-transversal sets are shown and thus TC (G)/|G|≤1/2 for all G ∈ F. 相似文献
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《海外英语》2007,(5):10-11
Many college freshmen arrive woefully unprepared to do college work, and as disadvantaged populations continue to grow, the share of the American work force that has made it through college is expected to plummet. Many experts blame that educational failure not just on high schools but also on colleges. School & College, a special report by The Chronicle, looks at efforts to fix the system. What reforms would better prepare students for college? What should schools and colleges be doing differently? How should state and federal officials help? 相似文献
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陈美曦 《山东教育学院学报》2008,23(2):103-107
Different nations have different social cultures, and the social culture of every nation is developing with the development of the nation, language is greatly influenced by social culture, which enables language to possess national and historical characteristics. Word is the smallest, independent, meaningful linguistic unit of language. It can well reflect the national and historical characteristics. From synchronic aspect, the social and cultural influence on word meaning is mainly embodied in conceptual and associative meanings of word. The incorrespondence of word meaning is a phenomenon that exists in both conceptual and associative meanings of word among different languages. From diachronic aspect, the development of social culture causes some changes of word meaning to some extent. Therefore, social culture plays a key role in vocabulary learning and mastery of a language. 相似文献
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邱崇丙 《唐山师范学院学报》2014,(1):21-23
汉字的六书,《说文》对“转注”一类,语焉不详。后世学者提及转注,也仅限于许慎所举出的例字。《汉字例说》一文,作者从转注的角度综合考虑,对部分现代常用字作了分析,跟传统的解释有所不同。希望能抛砖引玉,互相切磋,以推进学术研究。 相似文献
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《海外英语》2007,(4):36
There are numbers of crossroads on our long and unpredictable life journey where we totally have no idea about which direction to choose. No matter what our decision is, we should not turn back, but face the music and go ahead instead. I am this kind of girl who always does try without regretting, one example is how I dealt with my love. 相似文献
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Migration occurs behind a variety of reasons and has a great effect on the whole world. People may migrate in order to improve their economic situation, or in order to escape civil strife, persecution, and environmental disasters. The impact of migration is complex, bringing both benefits anddisadvantages. This paper briefly talks about the causes of migration, the allocation of benefits, and the ways in which individual countries and the international community deal with this important subject. 相似文献