26 September 2016 Speckle-reducing scale-invariant feature transform match for synthetic aperture radar image registration
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J. of Applied Remote Sensing, 10(3), 036030 (2016). doi:10.1117/1.JRS.10.036030
The anisotropic scale space (ASS) is often used to enhance the performance of a scale-invariant feature transform (SIFT) algorithm in the registration of synthetic aperture radar (SAR) images. The existing ASS-based methods usually suffer from unstable keypoints and false matches, since the anisotropic diffusion filtering has limitations in reducing the speckle noise from SAR images while building the ASS image representation. We proposed a speckle reducing SIFT match method to obtain stable keypoints and acquire precise matches for the SAR image registration. First, the keypoints are detected in a speckle reducing anisotropic scale space constructed by the speckle reducing anisotropic diffusion, so that speckle noise is greatly reduced and prominent structures of the images are preserved, consequently the stable keypoints can be derived. Next, the probabilistic relaxation labeling approach is employed to establish the matches of the keypoints then the correct match rate of the keypoints is significantly increased. Experiments conducted on simulated speckled images and real SAR images demonstrate the effectiveness of the proposed method.
© 2016 Society of Photo-Optical Instrumentation Engineers (SPIE)
Xianmin Wang, Bo Li, Qizhi Xu, "Speckle-reducing scale-invariant feature transform match for synthetic aperture radar image registration," Journal of Applied Remote Sensing 10(3), 036030 (26 September 2016). https://doi.org/10.1117/1.JRS.10.036030

Synthetic aperture radar


Image registration

Image filtering


Anisotropic diffusion

Anisotropic filtering

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