航拍胶片注释信息阈值分割算法研究

航拍胶片注释信息对后续的图像处理非常重要,但是曝光不均、相机抖动或者胶片数字化产生的畸变都会导致注释信息产生背景模糊、泛白、灰度不均等现象,这给注释信息标识符的分割和识别带来很大困难。该文提出了一种基于CASDA与Niblack相结合的阈值分割算法,能够有效解决传统分割方法存在的字符分割断裂问题。实验证明,该算法能够在保证注释信息准确分割的同时兼顾处理速度。     

Hybrid region merging method for segmentation of high-resolution remote sensing images

Image segmentation remains a challenging problem for object-based image analysis. In this paper, a hybrid region merging (HRM) method is proposed to segment high-resolution remote sensing images. HRM integrates the advantages of global-oriented and local-oriented region merging strategies into a unified framework. The globally most-similar pair of regions is used to determine the starting point of a growing region, which provides an elegant way to avoid the problem of starting point assignment and to enhance the optimization ability for local-oriented region merging. During the region growing procedure, the merging iterations are constrained within the local vicinity, so that the segmentation is accelerated and can reflect the local context, as compared with the global-oriented method. A set of high-resolution remote sensing images is used to test the effectiveness of the HRM method, and three region-based remote sensing image segmentation methods are adopted for comparison, including the hierarchical stepwise optimization (HSWO) method, the local-mutual best region merging (LMM) method, and the multiresolution segmentation (MRS) method embedded in eCognition Developer software. Both the supervised evaluation and visual assessment show that HRM performs better than HSWO and LMM by combining both their advantages. The segmentation results of HRM and MRS are visually comparable, but HRM can describe objects as single regions better than MRS, and the supervised and unsupervised evaluation results further prove the superiority of HRM.     

Rôle de l'halocinèse dans l'évolution du bassin d'Essaouira (Sud-Ouest marocain)

The seismic reflection studies carried in the Essaouira Basin, intermediate zone between the High Atlas and the Atlantic Margin, show the presence of halokinetic structures that played a significant role in the evolution of the basin. Salt dynamics was controlled by the Atlantic rifting and the Atlasic orogen. These tectonic controls and the margin segmentation are responsible for the diachronism of salt movement. Halokinesis varied in time and space in the basin and was more active offshore, where autochtonous and allochtonous salt layers are present. To cite this article: K. Mehdi et al., C. R. Geoscience 336 (2004).     

西秦岭北缘断裂带的位移累积滑动亏损特征及其破裂分段性研究

根据西秦岭北缘断裂带的水平位移分组特征,定量计算了断裂端部和不连续部位的位移累积滑动亏损率,同时结合断裂带上的障碍体规模,滑动速率的差异,历史地震及古地震特征等,对断裂带进行了破裂分段性研究,结果表明,西秦岭北缘断裂带可以划分为鸳凤断裂,漳县断裂,锅麻滩断裂３条一级破裂段,６条二级破裂段。     

SRRG-MRF的SAR海冰图像分割算法

针对SAR海冰图像受相干斑噪声影响严重, 提出采用相干斑抑制区域生长模型的区域MRF(SRRG-MRF)分割算法。SRRG区域模型包括构建图像的相干斑抑制区域化表达和基于区域的灰度相似性进行区域生长两个部分,其中相干斑抑制的区域化表达由相干斑抑制的双边滤波(SRBF)算法和分水岭变换构成, 该模型在相干斑噪声严重的情况下, 能够有效抑制过分割和对目标边缘准确定位, 并防止MRF分割优化陷入局部最小值, 减少误分割。将SRRG区域模型与MRF相结合, 能够大幅度减少优化搜索空间, 获得准确的分割结果。采用不同视数的SAR海冰合成图像和由RADARSAT-2及SIR-C获取的SAR海冰真实图像进行测试, 结果表明: 与已有区域MRF分割算法相比,本文算法能够有效提高分割准确性。     

JJG自动气象站气象要素计量性能要求合理性探讨

针对自动气象站的温度、雨量对应的检定规程,就其相关指标和规定的合理性进行探讨。目的在于让检定规程更加完善、合理。根据相应仪器本身的特性,结合实际工作经验,以分析误差构成进行理论推导,得出温度（地温）,雨量计量性能要求中最大允许误差等不合理的结果,从误差公式中重新确定了温度、雨量的最大允许误差,分别对规程指标的确定提出了修改建议。     

基于K-L变换的彩色航空影像阴影检测

从K-L变换的原理及其特性出发,提出了一种利用K-L变换技术来对影像上的阴影进行检测的方法,实验表明其对彩色航空影像上阴影区域的检测是有效的.     

一种改进的阈值法提取SAR图像海面油污

对阈值的选取作了相关研究,提出了一种改进的阈值法提取SAR图像海面油膜。试验表明,改进方法在提取海面油膜的应用中具有一定的可行性。     

基于面向对象分类方法在SPOT影像中的地物信息提取

利用基于面向对象分类方法的eCognition软件,以桂林寨底地区为研究区,对影像中各类地物设置不同的分割参数,即初始分割尺度为30,形状因子为0.1,光谱因子为0.9,紧凑度为0.7,光滑度为0.3,能够比较准确地分割出水体、植被、非植被3类地物.根据建立的类层次结构,继续对植被和非植被2个大类进行细分,结果表明当分...