排序方式: 共有29条查询结果,搜索用时 917 毫秒
11.
In this paper, a novel change detection approach is proposed for multitemporal synthetic aperture radar (SAR) images. The approach is based on two difference images, which are constructed through intensity and texture information, respectively. In the extraction of the texture differences, robust principal component analysis technique is used to separate irrelevant and noisy elements from Gabor responses. Then graph cuts are improved by a novel energy function based on multivariate generalized Gaussian model for more accurately fitting. The effectiveness of the proposed method is proved by the experiment results obtained on several real SAR images data sets. 相似文献
12.
针对腹部CT图像中组织分割的问题,提出了一种基于图割与改进的快速水平集的交互式分割方法。首先对人工给定的一个待分割目标的初始轮廓作膨胀运算,将所得内部边界所有像素点作为源点、外部边界像素点作为汇点构造图,并通过图割方法对CT图像进行初步分割,然后以膨胀所得内部边界作为初始轮廓,通过基于区域竞争主动轮廓模型(RCAC)的... 相似文献
13.
针对高分辨率遥感影像分割方法提取的建筑物边缘不准确和不规则等问题,提出了一种新的边缘轮廓信息提取方法:首先,通过一维Gabor滤波器获取建筑物的角度纹理特征,并结合光谱特征构造待分割的特征矢量,在运用高斯混合模型(Gaussian mixture model,GMM)构造图的基础上,利用图割法(graph cuts)获取建筑物候选点,经数学形态学处理得到建筑物斑块;然后,根据Radon变换检测建筑物主方向,构建最小二乘匹配模板,并利用该模板在建立的轮廓缓冲区内精确地提取建筑物拐角点;最后,连接拐角点,完成了轮廓信息的提取。采用合成图像和高分辨率遥感影像提取建筑物轮廓信息的实验证明了该方法的可行性。 相似文献
14.
根据电法,人工地震勘探和钻孔资料分析了位于丹东东北部沿中朝边境长11km的鸭绿江断裂带分布特征。 相似文献
15.
16.
17.
18.
中朝地台东北缘3km深度地震层析成像的地质解释 总被引:1,自引:0,他引:1
利用本区丰富的地质,人工地震探测资料,对3km深度层析成象成果进行了分析对比,结果表明:(1)3Km深度速度值与人工地震探测所获地震波速值吻合较好;(2)3km深度速度分布与该深度处的岩石介质分布有较好的对应关系,高速区对应地层主要为太古界-下元古界变质岩和地槽区的古生界浅变质岩,低速区对应主要为中生界火山,碎屑岩,燕山期花岗岩体和盖层性质的中元古-古代界沉积岩。(3)层析成象结果可划分深度不同的 相似文献
19.
20.
Ronald Blake 《Area》2009,41(3):285-299
Since the ending of the Cold War, over one-third of Britain's home military airfields have closed, leaving fewer than 50 in active flying use. An historical review of air force contraction since 1945 provides the context for this significant land-use change. Contrasting scales of abandonment at regional level suggest where the impacts of closures on the environment and society have been strongest. Spatial shifts in the key military airfield functions (combat, air support, training and aircraft supply) indicate a strategic reorientation of the nation's defences. Location and role data for 75 airfields either closed during the past 20 years or still active in 2008 are tabulated to assist future geographical research on British aviation and defence. 相似文献