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A NEW APPROACH TO EDGE DETECTION OF SAR IMAGES |
Zhao Zhiqin; Han Chunlin; Wang Jianguo; Huang Shunji |
Dept. of Electron. Eng., Univ. of Elec. Sci. and Tech. of China Chengdu 610054 China |
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Abstract The high frequency part of wavelet transform reflects the detail of edges. And median filter is a kind of nonlinear stack filter, it has good abilities in keeping edge and filtering clutter. Based on the analysis of the characteristics of the images of Synthetic Aperture Radar (SAR), this paper puts forward a combined method for edge s detection of SAR images. This method is composed of wavelet transform, fuzzy median filter, adaptive thresholding and differential gradient operator. In using fuzzy median filter, this paper gives out a new method for adaptive selecting the factors of fuzzy median filter. The experimental results show the effectiveness and stability of this method.
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Received: 15 October 1999
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