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石晓进; 张云华; 北京8701信箱
Source Publication电子与信息学报
Keyword干涉合成孔径雷达 重复轨道 图像配准 fourier-mellin变换 相干系数法
Abstract相对于单轨双天线InSAR系统,重复轨道InSAR系统由于轨道不能完全平行,导致InSAR图像对间存在夹角,使其配准更为困难.该文针对非平行重复轨道的InSAR问题,提出了一种结合Fourier-Mellin变换和相干系数法的InSAR图像配准算法,对存在夹角的SAR复图像对进行精确配准.该方法用于粗配准时,通过引入非线性图像幅度变换预处理,克服了Fourier-Mellin变换无法直接处理SAR图像对幅度分布动态范围大且不均匀的问题,而用于精配准时,通过引入相干系数法,精确估计了复图像对之间存在的微小角度.以SIR-C/X重复轨道的X波段SAR数据为例,详细比较了传统相干系数配准算法和该文算法在配准精度和计算时间上的差异,从而验证了算法的有效性.; Aim In order to evaluate image scrambling quality good or bad actually, new image scrambling quality evaluation method based on Fourier transform is proposed.Methods Original and scrambled images are firstly divided into a number of blockswith equal size, and their blocks with equal size are transformed into coefficients in frequency field bymeans of Fourier transform. Then difference matrixes are constructed bymeans of the frequency field coefficients of original and scrambled images and their discrete probabilitymodels are defined.In the end, the image scrambling quality evaluation function is constructed by information energy of the discrete p robability distribution for difference coefficientmatrixes. Results A kind of new scrambling quality evaluation function is given, and evaluation results of scrambled images bymean of different scrambling algorithms show that the evaluation method in mentioned above is feasible. Conclusion The evaluation method proposed is verywell capable ofmeasuring scrambling degree of scrambled image, and effective to describe the relation between the scrambling quality and the number of iterations in the scrambling techniques, which is largely consistentwith human vision.For different images,when some scrambling transformation is used, this evaluation method can reflect the scrambling quality in each scrambling stage to some extent
Indexed ByCSCD
Funding Project中国科学院空间科学与应用研究中心
Citation statistics
Cited Times:7[CSCD]   [CSCD Record]
Document Type期刊论文
Corresponding Author北京8701信箱
Recommended Citation
GB/T 7714
石晓进,张云华,北京8701信箱. 基于Fourier-Mellin变换和相干系数法的重复轨道干涉SAR图像配准新方法[J]. 电子与信息学报,2009(4):803-807.
APA 石晓进,张云华,&北京8701信箱.(2009).基于Fourier-Mellin变换和相干系数法的重复轨道干涉SAR图像配准新方法.电子与信息学报(4),803-807.
MLA 石晓进,et al."基于Fourier-Mellin变换和相干系数法的重复轨道干涉SAR图像配准新方法".电子与信息学报 .4(2009):803-807.
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