Many applications such as image compression, pre-processing or segmentation require some information from the regions composing an image. The main objective of this paper is to define a methodology to extract some loc...
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ISBN:
(纸本)3540288333
Many applications such as image compression, pre-processing or segmentation require some information from the regions composing an image. The main objective of this paper is to define a methodology to extract some local information from an image. Each region is characterized in terms of homogeneity (region composed with the same grey-level or a single texture) and its type (textured or uniform). The decision criterion is based on the use of classical texture attributes (cooccurrence matrix and grey-levels moments) and a support vector machine in order to realize the fusion of the different attributes. We then characterize each region considering its type by appropriate features.
In this paper, a novel context-sensitive classification technique based on Support Vector Machines (CS-SVM) is proposed. This technique aims at exploiting the promising SVM method for classification of 2-D (or n-D) sc...
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ISBN:
(纸本)3540305068
In this paper, a novel context-sensitive classification technique based on Support Vector Machines (CS-SVM) is proposed. This technique aims at exploiting the promising SVM method for classification of 2-D (or n-D) scenes by considering the spatial-context information of the pixel to be analyzed. ne context-based architecture is defined by properly integrating SVMs with a Markov Random Field (MRF) approach. In the design of the resulting system, two main issues have been addressed: i) estimation of the observation term statistic (class-conditional densities) with a proper multiclass SVM architecture;ii) integration of the SVM approach in the framework of MRFs for modeling the prior model of images. Thanks to the effectiveness of the SVM machine learning strategy and to the capability of MRFs to properly model the spatial-contextual information of the scene, the resulting context-sensitive image classification procedure generates regularized classification maps characterized by a high accuracy. Experimental results obtained on Synthetic Aperture Radar (SAR) remotesensingimages confirm the effectiveness of the proposed approach.
This paper addresses the issue on automated registration of images from weather satellites. Traditionally, weather satellite community has employed an approach called landmark detection for automated registration. A g...
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This paper addresses the issue on automated registration of images from weather satellites. Traditionally, weather satellite community has employed an approach called landmark detection for automated registration. A ground point or feature with known reference coordinates is defined as landmark. A landmark is matched against a weather satellite image. Based on match results estimated is the mapping function between images and a reference datum. This landmark detection approach has been suffered from the problem of mismatches. If match results contain errors, the accuracy of estimation deteriorates. To overcome this problem, we propose the use of a robust estimation technique called random sample consensus (RANSAC). Through intelligent strategy this robust estimator will distinguish inliers from outliers and establish the mapping function with inliers only. This estimator has been reported to work in land observation satellite applications as well as in many computer vision applications. We will show that the RANSAC can also work for our purpose. We tested our approach using a global coastline database and a GOES-9 image. A global coastline database was processed to generate 30 landmarks. They were matched against a GOES-9 image. Visible inspection revealed that the results contained 13 mismatches. With 30 match results the RANSAC was applied. It identified all 13 mismatches correctly. We can conclude that the RANSAC is able to select correct matches. For reliable automated registration, the RANSAC needs to be incorporated in the landmark detection process of weather satellite images.
In this study, Bayesian networks are considered to be a classifier for the remotesensingimage named Aster data, which involves 15 bands. Six. bands, which have different spatial resolutions, are selected to be the a...
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ISBN:
(纸本)0819460079
In this study, Bayesian networks are considered to be a classifier for the remotesensingimage named Aster data, which involves 15 bands. Six. bands, which have different spatial resolutions, are selected to be the attributes in Bayesian network classifier. The sample data from Aster image that is fused by wavelet transform is used to train Bayesian network classifier. Before the above-mentioned processing, the attributes from the transformed image should be normalized by some equal width schemes. Then the learning scheme process is used to acquire the structure of Bayesian networks from the training data set. The relationship of the attributes among all the constituents of the imagery data is mined through the Bayesian networks. To evaluate this classifier, a comprehensive study of the performance is investigated based on the training data set and the independent test data sets. The result shows that Bayesian network performs well on remotesensingimagery data.
Due to the complexity and non-regularity of tree shapes, traditional digital photogrammetry using stereo matching method is difficult to obtain the accurate tree height, This fact therefore limits the application of t...
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ISBN:
(纸本)0819460079
Due to the complexity and non-regularity of tree shapes, traditional digital photogrammetry using stereo matching method is difficult to obtain the accurate tree height, This fact therefore limits the application of the aerial digital photogrammetry technology in the power line survey. This paper presents a method of tree height extraction from large viewing aerial image using the knowledge of segmented tree crown. This method is based on a rough digital surface model (DSM) of tree crowns and the exterior orientation of the image. The basic steps of this method is that the DSM is first used to find the region of interest in the image based on the exterior orientation, and then the edges of the distinct trees or branches are extracted using image segmentation technology. An algorithm that uses both the rough DSM height information and exterior orientation data to calculate the accurate heights of the segmented trees or branches is presented. The algorithm assumes that most of the trees are upright, and the projection in the large viewing angle images of the crown and branches can therefore be used to calculate their heights relative to the averaged DSM height. Hence, the accurate height of the trees around the rough DSM can be refined. Some experimental results are given with the image captured from multi-angular imaging system mounted on a helicopter in which a Position and Orientation System (POS) is onboard to record the exterior element of the cameras. The experimental results demonstrated that this algorithm can largely improve the accuracy of tree height extraction. The application in power line monitoring system is promising.
Landuse classification is an important problem in the remotesensing field. It can be used in a wide range of applications. In this paper, we propose a hybrid method fusing edges and regions information for the landus...
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Landuse classification is an important problem in the remotesensing field. It can be used in a wide range of applications. In this paper, we propose a hybrid method fusing edges and regions information for the landuse classification of multispectral images. It mainly includes the steps of image pre-processing, initial segmentation and region merging. Especially, a novel spatial mean shift procedure is proposed so that some information can be extracted and used in the successive steps. Aiming at the multispectral images processing, we also design a band weighting strategy that give a proper weight to each band adoptively according to the region to be processed. Experimental results on the Landsat TM and ETM+ images validate the performance of the proposed method.
We present a textural kernel for "support vector machines" classification applied to remotesensing problems. SVMs constitute a method of supervised classification well adapted to deal with data of high dime...
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We present a textural kernel for "support vector machines" classification applied to remotesensing problems. SVMs constitute a method of supervised classification well adapted to deal with data of high dimension, such as images. We introduce kernel functions in order to favor the distinction between our class of interest and the other classes: it gives information of similarity. In our case this similarity is based on radiometric and textural characteristics. One of the main difficulties is to elaborate textural parameters which are relevant and characterize as well as possible the joint distribution of a set of connected pixels. We apply this method to remotesensing problems: the detection of forest fires and the extraction of urban areas in high resolution images.
The performance of a statistical imageprocessing system depends in large part on the accuracy of the probabilistic model used. This paper presents a robust probabilistic mixture model based on the Dirichlet distribut...
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The performance of a statistical imageprocessing system depends in large part on the accuracy of the probabilistic model used. This paper presents a robust probabilistic mixture model based on the Dirichlet distribution. An unsupervised algorithm based on MML for learning this mixture is given, too. Experimental results involve shadows modeling and its application to shadows detection in images.
In this paper, a new image classification method is developed. This approach applies graph decomposition and probabilistic neural networks (PNN) to the task of supervised image classification. We use relational graphs...
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In this paper, a new image classification method is developed. This approach applies graph decomposition and probabilistic neural networks (PNN) to the task of supervised image classification. We use relational graphs to represent image. These graphs are constructed from the feature points of images. Spectra of these graphs are obtained as feature vectors for classification. PNN is adopted to classify image according to the feature vectors. Experimental results show that this method can achieve best result of images classification.
Generalized learning model, GLM for short, is a new kind of machine learning model which fuses symbolic learning, connective learning, fuzzy learning, evolutionary learning and statistical learning together. By introd...
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Generalized learning model, GLM for short, is a new kind of machine learning model which fuses symbolic learning, connective learning, fuzzy learning, evolutionary learning and statistical learning together. By introducing generalized learning into imagerecognition, this paper presents a new kind of imagerecognition model, GLIRM for short. The distinguished advantage of GLIRM is its adaptive learning ability. Through practical application in remotesensingimagerecognition, satisfactory results have been achieved.
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