A Registration Method for Dual-Frequency, High-Spatial-Resolution SAR Images

被引:2
|
作者
Huang, Junnan [1 ]
An, Daoxiang [1 ]
Luo, Yuxiao [1 ]
Chen, Jingwei [1 ]
Zhou, Zhimin [1 ]
Chen, Leping [1 ]
Feng, Dong [1 ]
机构
[1] Natl Univ Def Technol, Coll Elect Sci & Technol, Changsha 410073, Peoples R China
基金
美国国家科学基金会;
关键词
high-resolution SAR image; dual-frequency; image registration; edge feature;
D O I
10.3390/rs14102509
中图分类号
X [环境科学、安全科学];
学科分类号
08 ; 0830 ;
摘要
With the continuous development of synthetic-aperture-radar (SAR) technology, SAR-image data are becoming increasingly abundant. For the same scene, dual-frequency (high-frequency and low-frequency) SAR images can present different details and feature information. Image fusion of the two frequencies can combine the advantages of both, thus describing targets more comprehensively. Image registration is the key step of image fusion and determines the quality of fusion. Due to the complex geometric distortion and gray variance between dual-frequency SAR images with high resolution, it is difficult to realize accurate registration between the two. In order to solve this problem, this paper proposes a method to achieve accurate registration by combining edge features and gray information. Firstly, this paper applies the edge features of images and a registration algorithm based on fast Fourier transform (FFT) to realize rapid coarse registration. Then, combining a registration algorithm based on the enhanced correlation coefficient (ECC) with the concept of segmentation, the coarse-registration result is registered to achieve accurate registration. Finally, by processing the airborne L-band and Ku-band SAR data, the correctness, effectiveness, and practicability of the proposed method are verified, with a root mean square error (RMSE) of less than 2.
引用
收藏
页数:19
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