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As SAR adopts an oblique distance imaging mode, due to obvious speckle multiplicative noise, the registration accuracy of SAR and optical images is low. This study proposes using Zernike polynomials to fit the front of the complex SAR echo data to obtain its phase feature, simultaneously extracting the SAR Zernike matrix feature from the complex echo phase and optical image, and using it to construct the registration descriptor to realize the registration of SAR and optical images. Experimental results show that the proposed method avoids the problem of obvious coherent speckle noise, the target characteristics are more prominent, the registration accuracy is higher, and the ability to recognize SAR targets and scenes is improved.

An anti- speckle multiplicative noise SAR and optical image registration method based on Zernike matrix-phase features