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Remote Sens. 2014, 6(1), 157-179; doi:10.3390/rs6010157

Automatic Registration Method for Fusion of ZY-1-02C Satellite Images

School of Remote Sensing and Information Engineering, Wuhan University, Wuhan 430079, China
Author to whom correspondence should be addressed.
Received: 3 November 2013 / Revised: 9 December 2013 / Accepted: 10 December 2013 / Published: 20 December 2013
(This article belongs to the Special Issue Satellite Mapping Technology and Application)
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Automatic image registration (AIR) has been widely studied in the fields of medical imaging, computer vision, and remote sensing. In various cases, such as image fusion, high registration accuracy should be achieved to meet application requirements. For satellite images, the large image size and unstable positioning accuracy resulting from the limited manufacturing technology of charge-coupled device, focal plane distortion, and unrecorded spacecraft jitter lead to difficulty in obtaining agreeable corresponding points for registration using only area-based matching or feature-based matching. In this situation, a coarse-to-fine matching strategy integrating two types of algorithms is proven feasible and effective. In this paper, an AIR method for application to the fusion of ZY-1-02C satellite imagery is proposed. First, the images are geometrically corrected. Coarse matching, based on scale invariant feature transform, is performed for the subsampled corrected images, and a rough global estimation is made with the matching results. Harris feature points are then extracted, and the coordinates of the corresponding points are calculated according to the global estimation results. Precise matching is conducted, based on normalized cross correlation and least squares matching. As complex image distortion cannot be precisely estimated, a local estimation using the structure of triangulated irregular network is applied to eliminate the false matches. Finally, image resampling is conducted, based on local affine transformation, to achieve high-precision registration. Experiments with ZY-1-02C datasets demonstrate that the accuracy of the proposed method meets the requirements of fusion application, and its efficiency is also suitable for the commercial operation of the automatic satellite data process system.
Keywords: ZY-1-02C; SIFT; normalized cross correlation; image matching; registration ZY-1-02C; SIFT; normalized cross correlation; image matching; registration

This is an open access article distributed under the Creative Commons Attribution License (CC BY 3.0).

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Chen, Q.; Wang, S.; Wang, B.; Sun, M. Automatic Registration Method for Fusion of ZY-1-02C Satellite Images. Remote Sens. 2014, 6, 157-179.

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