A Registration Algorithm Based on Feature Point

The existing speckle noise in SAR image produces serious impact on the registration, this paper presents a algorithm of multi-level non-linear weighted mean median filtering, smoothly filtering SAR, effectively suppressing speckle noise in images while maintaining the image geometry, thus the noise on the registration accuracy can be reduced. For registration of high-resolution remote sensing image, the paper improves the traditional method with registration between SAR and panchromatic image, an automatic registration algorithm based on the control point is proposed, which determine the registration evaluation through subjective and objective methods. Experimental results show that the algorithm can select and match control points without human intervention, with fast calculating speed, and it reaches sub-pixel level registration, with good registration effect.