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Analytic Search Method for Interferometric SAR Image Registration

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4 Author(s)
Bao-quan Liu ; Nat. Lab. of Radar Signal Process., Xidian Univ., Xi''an ; Da-Zheng Feng ; Peng-Lang Shui ; Nan Wu

We propose an analytic search method for interferometric synthetic aperture radar (InSAR) image registration. An analytic cost function is established, and the subpixel offsets associated with the maximum of the cost function are continuously searched by direction-alternate optimization methods along vertical and horizontal directions. We establish a novel dual-quartic analytic cost function for extraction of subpixel offsets from a corresponding pixel pair established by pixel-level registration. A robust optimization method that is called biiteration algorithm for searching the maximum point of the dual-quartic cost function is developed to solve the subpixel offsets. Since the dual-quartic cost function is quartic if one of two parameters is fixed, one of two substeps including in each iterative step of the efficient biiterative method is to find the solution by the secant method. The performances of the proposed method are shown by using simulated and real data and compared with those of representative existing registration method.

Published in:

Geoscience and Remote Sensing Letters, IEEE  (Volume:5 ,  Issue: 2 )

Date of Publication:

April 2008

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