Polarimetric SAR (synthetic aperture radar) image classification method based on pyramid sampling and SVM (support vector machine)

Abstract

The invention discloses a polarimetric SAR (synthetic aperture radar) image classification method based on pyramid sampling and an SVM (support vector machine) and solves the problem of the prior art that classification precision is low. The polarimetric SAR image classification method includes filtering polarimetric SAR images; extracting the pyramid sampling-based sampling scattering feature of the polarimetric SAR images; extracting a polarizing scattering feature and a wavelet texture feature of the polarimetric SAR images, combing the sampling scattering feature, the polarizing scattering feature and the wavelet texture feature to obtain a combination feature, training a classifier of the SVM with the combination feature; classifying the polarimetric SAR images with the trained classifier, and coloring the polarimetric SAR images classified. The polarimetric SAR image classification method is good in denoising effect, high in image quality and classification precision and applicable to object identification of the polarimetric SAR images.

Description

technical field [0001] The invention belongs to the field of radar technology, in particular to image classification of polarization synthetic aperture radar SAR, which can be used for target recognition. Background technique [0002] Polarization synthetic aperture radar (SAR) has become one of the important development directions of synthetic aperture radar at home and abroad. Compared with single-polarization radar images, polarization SAR images can provide more ground object information. Image classification is one of the important contents of polarimetric SAR image interpretation, which has been widely used in military and civilian fields. Fast and accurate SAR image classification is the prerequisite for various practical applications. Therefore, it is of great significance to study the classification of polarimetric SAR images. Classification methods have always been a hot spot in frontier research in this field. Many polarimetric SAR image classification methods h...

AI Technical Summary

Problems solved by technology

At present, the algorithms involved in polarimetric SAR image classification include: traditional image processing algorithms, representative algorithms include mean clustering algorithm, ISODATA algorithm, watershed algorithm, graph theory method, etc. Although these methods are based on theoretically mature classifiers, but Does not make full use of the target scattering mechanism for polarization SAR image classification; based on the classification method of the general pyramid model, the advantage of the pyramid model is that the domain information is taken into account. In the marked area, the sample division is very clean, but this method also has boundary division Not obvious, and in the case of few sample points, the accuracy is not high

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