| Polarimetric Synthetic Aperture Radar Image Classification by a Hybrid Method |
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| 作者姓名： | Kamran Ullah Khan 杨建 |
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| 作者单位： | Department of Electronic Engineering Tsinghua University，Department of Electronic Engineering Tsinghua University，Beijing 100084 China，Beijing 100084 China |
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| 基金项目： | 国家自然科学基金;高等学校博士学科点专项科研项目 |
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| 摘 要： | Different methods proposed so far for accurate classification of land cover types in polarimetric synthetic aperture radar (SAR) image are data specific and no general method is available. A novel hybrid framework for this classification was developed in this work. A set of effective features derived from the coherence matrix of polarimetric SAR data was proposed. Constituents of the feature set are wavelet, texture, and nonlinear features. The proposed feature set has a strong discrimination power. A neural network was used as the classification engine in a unique way. By exploiting the speed of the conjugate gradient method and the convergence rate of the Levenberg-Marquardt method (near the optimal point), an overall speed up of the classification procedure was achieved. Principal component analysis (PCA) was used to shrink the dimension of the feature vector without sacrificing much of the classification accuracy. The proposed approach is compared with the maximum likelihood estimator (MLE) based on the complex Wishart distribution and the results show the superiority of the proposed method, with the average classification accuracy by the proposed method (95.4%) higher than that of the MLE (93.77%). Use of PCA to reduce the dimensionality of the feature vector helps reduce the memory requirements and computational cost, thereby enhancing the speed of the process.
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| 关 键 词： | 极化测定 合成孔径雷达 图象分类 组合法 离散小波变换 主成分分析 |
| 收稿时间： | 31 January 2006 |
| 修稿时间： | 2006-01-312006-09-12 |
Polarimetric Synthetic Aperture Radar Image Classification by a Hybrid Method |
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| Kamran Ullah Khan,YANG Jian.Polarimetric Synthetic Aperture Radar Image Classification by a Hybrid Method[J].Tsinghua Science and Technology,2007,12(1):97-104. |
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| Authors: | Kamran Ullah Khan YANG Jian |
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| Institution: | Department of Electronic Engineering, Tsinghua University, Beijing 100084, China |
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| Abstract: | Different methods proposed so far for accurate classification of land cover types in polarimetric synthetic aperture radar (SAR) image are data specific and no general method is available. A novel hybrid framework for this classification was developed in this work. A set of effective features derived from the coherence matrix of polarimetric SAR data was proposed. Constituents of the feature set are wavelet, texture, and nonlinear features. The proposed feature set has a strong discrimination power. A neural network was used as the classification engine in a unique way. By exploiting the speed of the conjugate gradient method and the convergence rate of the Levenberg-Marquardt method (near the optimal point), an overall speed up of the classification procedure was achieved. Principal component analysis (PCA) was used to shrink the dimension of the feature vector without sacrificing much of the classification accuracy. The proposed approach is compared with the maximum likelihood estimator (MLE) based on the complex Wishart distribution and the results show the superiority of the proposed method, with the average classification accuracy by the proposed method (95.4%) higher than that of the MLE (93.77%). Use of PCA to reduce the dimensionality of the feature vector helps reduce the memory requirements and computational cost, thereby enhancing the speed of the process. |
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| Keywords: | undecimated discrete wavelet transform (UDVVT) neural network principal component analysis (PCA) |
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