共查询到20条相似文献,搜索用时 31 毫秒
1.
2.
3.
4.
随着我国高分对地观测系统的不断发展,对高分影像智能化分析与处理的应用需求愈来愈多,基于深度学习语义分割的影像分类也受到高度关注。作为近景图像语义分割的热点模型,Deeplab网络在应用时取得了良好的效果。为了解决多尺度高分辨率遥感影像语义分割问题,本文首先利用空洞卷积扩大Atrous空间金字塔池化(ASPP)结构的感受野,然后对DeepLabv3进行改进并将其用于高分2号遥感影像的分类处理。我们以郴州地区的高分遥感影像为研究对方法进行了验证,首先对原始影像进行预处理,再对预处理图像进行数据增强与扩充,最后通过对不同参数条件下的分类结果进行对比,分析该模型的适应性和精确性。在我们的数据集中,本文方法的实验分类像素精度为88.2%,MIoU达到72.5%,得到了比Deeplab更好的分类效果。 相似文献
5.
The availability of a wide set of multidimensional information sources in different application fields (e.g., color cameras, multispectral remote sensing imagery devices, etc.) is the basis for the interest of image processing research on extensions of scalar nonlinear filtering approaches to multidimensional data filtering. A new approach to multidimensional median filtering is presented. The method is structured into two steps. Absolute sorting of the vectorial space based on Peano space filling curves is proposed as a preliminary step in order to map vectorial data onto an appropriate one-dimensional (1-D) space. Then, a scalar median filtering operation is applied. The main advantage of the proposed approach is the computational efficiency of the absolute sorting step, which makes the method globally faster than existing median filtering techniques. This is particularly important when dealing with a large amount of data (e.g., image sequences). Presented results also show that the filtering performances of the proposed approach are comparable with those of vector median filters presented in the literature. 相似文献
6.
Low-level image analysis systems typically detect "points of interest", i.e., areas of natural images that contain corners or edges. Most of the robust and computationally efficient detectors proposed for this task use the autocorrelation matrix of the localized image derivatives. Although the performance of such detectors and their suitability for particular applications has been studied in relevant literature, their behavior under limited input source (image) precision or limited computational or energy resources is largely unknown. All existing frameworks assume that the input image is readily available for processing and that sufficient computational and energy resources exist for the completion of the result. Nevertheless, recent advances in incremental image sensors or compressed sensing, as well as the demand for low-complexity scene analysis in sensor networks now challenge these assumptions. In this paper, we investigate an approach to compute salient points of images incrementally, i.e., the salient point detector can operate with a coarsely quantized input image representation and successively refine the result (the derived salient points) as the image precision is successively refined by the sensor. This has the advantage that the image sensing and the salient point detection can be terminated at any input image precision (e.g., bound set by the sensory equipment or by computation, or by the salient point accuracy required by the application) and the obtained salient points under this precision are readily available. We focus on the popular detector proposed by Harris and Stephens and demonstrate how such an approach can operate when the image samples are refined in a bitwise manner, i.e., the image bitplanes are received one-by-one from the image sensor. We estimate the required energy for image sensing as well as the computation required for the salient point detection based on stochastic source modeling. The computation and energy required by the proposed incremental refinement approach is compared against the conventional salient-point detector realization that operates directly on each source precision and cannot refine the result. Our experiments demonstrate the feasibility of incremental approaches for salient point detection in various classes of natural images. In addition, a first comparison between the results obtained by the intermediate detectors is presented and a novel application for adaptive low-energy image sensing based on points of saliency is presented. 相似文献
7.
8.
Human-centered concepts for exploration and understanding of Earth observation images 总被引:4,自引:0,他引:4
The progress in information retrieval, computer vision, and image analysis makes it possible to establish very complete bases of algorithms and operators. A specialist in remote sensing or image processing now has the tools that allow him, at least in theory, to configure applications solving complex problems of image understanding. However, in reality, earth observation (EO) data analysis is still performed in a very laborious way at the end of repeated cycles of trial and error. To overcome this, we proposed a novel advanced remote sensing information processing system knowledge-driven information mining (KIM). KIM is based on human-centered concepts (HCCs), which implements new features and functions allowing improved feature extraction, search on a semantic level, the availability of collected knowledge, interactive knowledge discovery, and new visual user interfaces. We assess the HCC methodology for solving several difficult tasks in EO image interpretation, using a broad variety of sensor data, from meter-resolution synthetic aperture radar and optical images to hyperspectral data. 相似文献
9.
地理信息系统是处理地理信息的系统,简称GIS,包括空间定位数据、图形数据、遥感图像数据、属性数据等,用于采集、存储、管理、处理、检索、分析和表达地理空间数据的计算机系统,是分析海量地理数据的通用技术.具有地图处理、数据库和空间分析这三大功能,可以根据现有情况预测火情,也可以准确寻找鱼群,可以使短期内捕鱼量增长,但不能持续增加,很多渔民已经开始利用该项技术.本文主要分析了地理信息系统的发展趋势,对地理信息系统在海洋科学中的应用进行了简要的阐述. 相似文献
10.
云检测是遥感图像处理和应用的前提,针对遥感图像云检测的准确率容易受到薄云及似云地物影响的挑战,提出一种结合遥感影像灰度、纹理和频率特征的层次支持向量机云检测算法.该方法首先采用简单线性迭代聚类算法将遥感图像分割为像素块,再采用一种层次支持向量机分类器对遥感图像以像素块为单位进行云检测.层次支持向量机的第一层将像素块初步... 相似文献
11.
The system described is intended to link institutions (such as universities or industrial research organizations) that have most of their computers connected to local area networks (LANs). The main objective of the research is to bring users of remote systems together to collaborate in reviewing and editing documents containing text, graphs and image objects. The term workspace is used to denote a collection of such objects belonging to some application, and the software tools needed to access these objects. The major components of the system and the user interface are presented. A prototype implemented in C under 4.3BSD UNIX is discussed. The system is then related to and contrasted with other work on group collaboration. The suitability and shortcomings of UNIX as an operating system for building group collaboration software tools are assessed 相似文献
12.
Bell G. van Ingen C. 《Proceedings of the IEEE. Institute of Electrical and Electronics Engineers》1999,87(3):412-417
Distributed shared memory computers (DSMs) have arrived (G. Bell, 1992; 1996) to challenge mainframes. DSMs scale to 128 processors with two to eight processor nodes. As shared memory multiprocessors (SMPs), DSMs provide a single system image and maintain a “shared everything” model. Large scale UNIX servers using the SMP architecture challenge mainframes in legacy use and applications. These have up to 64 processors and a more uniform memory access. In contrast, clusters both complement and compete with SMPs and DSMs, using a “shared nothing” model. Clusters built from commodity computers, switches, and operating system scale to almost arbitrary sizes at lower cost while trading off SMPs single system image. Clusters are required for high availability applications. Highest performance scientific computers use the cluster (or MPP) approach. High growth markets, e.g., Internet servers, online transmission processing (OLTP), and database systems can all use clusters. The mainframe future of DSM may be questionable because: small SMPs are not as cost effective unless built from commodity components; large SMPs can be built without the DSM approach; and clusters are a cost effective alternative for most applications to SMPs, including DSMs for a wide scaling range. Nevertheless, commercial DSMs are being introduced that compete with SMPs over a broad range 相似文献
13.
《电子与信息学报》2015,37(8):1862-1867
面向静止轨道光学遥感卫星,该文提出一种海上运动舰船目标快速检测方法。该方法首先利用多结构多尺度形态学滤波对海洋背景遥感图像进行背景抑制;然后采用自适应阈值分割和自组织聚类获得候选目标;再根据目标运动特征,利用静止轨道卫星凝视序列图像对候选目标进行多目标移动式邻域判决,剔除虚假目标;最后关联舰船目标以及融合卫星平台数据,可快速计算舰船状态等深层次动态信息。实验结果与分析表明,所提方法能有效检测海洋背景遥感图像中的多个运动舰船目标,准确获取各个舰船位置、航速、航向、运动轨迹等信息,具有算法简单,目标检测率高、虚警率低,稳定性好等优点。该方法为我国静止轨道光学遥感卫星在轨数据处理与应用提供了技术支撑。 相似文献
14.
《Proceedings of the IEEE. Institute of Electrical and Electronics Engineers》2009,97(6):1031-1055
15.
高光谱图像(HSI)具有纳米级的光谱分辨能力且同时对地物目标的光谱维和空间维进行联合成像的优势,能够精细化感知场景目标的本征判别属性,在遥感探测、医疗诊断和国防安全等具有重要应用价值,是高精度遥感探测的科技制高点之一。不同于传统1维时间信号、2维图像信号,高光谱图像具有多阶、高维的信号属性。为解决传统信号处理方法在高光谱图像处理领域中的不足,图信号处理(GSP)理论与方法被逐渐引入高光谱图像处理与解译等任务中。该文以短综述的形式,介绍了图信号处理在高光谱图像处理领域的理论发展并列举了在高光谱特征提取、图像重构和解译分类3个主要方面的典型应用。最后,进一步探讨了该方向未来发展所面临的挑战和相应解决办法。 相似文献
16.
多光谱遥感相机提供的光谱图像信息具有极高的应用价值。为突破CCD成像器件谱段数量的限制、增加单台相机的谱段数量,提出了一种双通道的解决方法。从光学系统入手,对一种双通道离轴多光谱遥感相机进行了高稳定性光机结构设计。首先,通过使用四点球头支撑技术实现了对大口径主镜的高稳定性支撑,保证了在各个工况下反射镜面形精度满足使用要求。之后,对相机的焦面组件、主框架及隔振系统进行了设计及优化,保证了双通道离轴遥感相机在提供八个多光谱谱段的同时,具有良好的结构稳定性。最后,对整个相机进行有限元分析和力学环境试验,结果表明相机具有较高的稳定性,符合设计预期。 相似文献
17.
18.
Automatic Spectral Rule-Based Preliminary Mapping of Calibrated Landsat TM and ETM+ Images 总被引:1,自引:0,他引:1
《Geoscience and Remote Sensing, IEEE Transactions on》2006,44(9):2563-2586
Based on purely spectral-domain prior knowledge taken from the remote sensing (RS) literature, an original spectral (fuzzy) rule-based per-pixel classifier is proposed. Requiring no training and supervision to run, the proposed spectral rule-based system is suitable for the preliminary classification (primal sketch, in the Marr sense) of Landsat-5 Thematic Mapper and Landsat-7 Enhanced Thematic Mapper Plus images calibrated into planetary reflectance (albedo) and at-satellite temperature. The classification system consists of a modular hierarchical top-down processing structure, which is adaptive to image statistics, computationally efficient, and easy to modify, augment, or scale to other sensors' spectral properties, like those of the Advanced Spaceborne Thermal Emission and Reflection Radiometer and of the Satellite Pour l'Observation de la Terre (SPOT-4 and -5). As output, the proposed system detects a set of meaningful and reliable fuzzy spectral layers (strata) consistent (in terms of one-to-one or many-to-one relationships) with land cover classes found in levels I and II of the U.S. Geological Survey classification scheme. Although kernel spectral categories (e.g., strong vegetation) are detected without requiring any reference sample, their symbolic meaning is intermediate between those (low) of clusters and segments and those (high) of land cover classes (e.g., forest). This means that the application domain of the kernel spectral strata is by no means alternative to RS data clustering, image segmentation, and land cover classification. Rather, prior knowledge-based kernel spectral categories are naturally suitable for driving stratified application-specific classification, clustering, or segmentation of RS imagery that could involve training and supervision. The efficacy and robustness of the proposed rule-based system are tested in two operational RS image classification problems. 相似文献
19.
Santarelli M.F. Positano V. Landini L. 《IEEE transactions on information technology in biomedicine》2000,4(1):58-67
The paper deals with the integration of a powerful parallel computer based image analysis and visualization system for cardiology into a hospital information system. Further services are remote access to the hospital Web server through an Internet network. The visualization system includes dynamic three dimensional representation of two types of medical images (e.g., magnetic resonance and nuclear medicine) as well as two images in the same modality (e.g., basal versus stress images). A series of software tools for quantitative image analysis developed for supporting diagnosis of cardiac disease are also available, including automated image segmentation and quantitative time evaluation of left ventricular volumes and related indices during cardiac cycle, myocardial mass, and myocardial perfusion indices. The system has been tested both at a specialized cardiologic center and for remote consultation in diagnosis of cardiac disease by using anatomical and perfusion magnetic resonance images 相似文献
20.
针对遥感成像过程中普遍存在的退化现象,通过遥感成像模拟,揭示了不同退化程度对遥感数据质量的影响,反映了考虑成像退化因素对提高卫星遥感数据信息提取能力的作用.基于成像退化采用的支持向量机方法对遥感图像地物分类的实验研究表明,这种方法使遥感图像地物分类精度得到明显提高,特别是支持向量机方法与图像恢复技术的结合,效果更为明显. 相似文献