自适应精致极化Lee滤波的复相干性估计方法

doi:10.11947/j.AGCS.2015.20140483

测绘学报 ›› 2015, Vol. 44 ›› Issue (12): 1331-1339.doi: 10.11947/j.AGCS.2015.20140483

自适应精致极化Lee滤波的复相干性估计方法

龙江平¹, 丁晓利^1,2, 汪长城¹

1. 中南大学测绘与国土信息工程系, 湖南长沙 410083;
2. 香港理工大学土地测量与地理资讯学系, 香港

收稿日期:2014-09-18 修回日期:2015-07-30 出版日期:2015-12-20 发布日期:2016-01-04
作者简介:龙江平(1982-),男,博士,研究方向为极化SAR和极化干涉SAR数据处理和应用。E-mail:longjiangping11@163.com
基金资助:
国家863计划(2012AA121301;2011AA120404);湖南省自然科学基金(12JJ4035)

Complex Coherence Estimation Based on Adaptive Refined Lee Filter

LONG Jiangping¹, DING Xiaoli^1,2, WANG Changcheng¹

1. Department of Surveying and Geo-informatics, Central South University, Changsha 410083, China;
2. Department of Land Surveying and Geo-informatics, Hong Kong Polytechnic University, Hong Kong

Received:2014-09-18 Revised:2015-07-30 Online:2015-12-20 Published:2016-01-04
Supported by:
The National High-tech Research and Development Program of China(863 program)(Nos.2012AA121301;2011AA120404);Hunan Natural Science Foundation Program(No.12JJ4035)

摘要/Abstract

摘要： 干涉相干性包含了极化SAR干涉测量(PolInSAR)中的极化和干涉信息,滑动窗口大小和滤波方法是准确估计干涉相干性的前提。本文以精致极化Lee滤波为基础,根据边缘检测和邻域相干性高低区分同质区域和异质区域,建立了自适应精致极化Lee滤波方法并估计相干性矩阵和干涉相干性。自适应精致极化Lee滤波能够根据边缘检测信息和邻域相干性高低程度调整滑动窗口大小并选择合适的估计方法,不仅提高了抑制斑点噪声的能力,而且保持了图像的边缘信息,有利于提高干涉相干性的估计精度。试验结果表明,该方法有效抑制了斑点噪声,较好地保持了SAR图像的边缘信息,有利于提高植被参数反演的精度。

关键词: 精致Lee滤波, 自适应窗口, 极化干涉相干性, 极化干涉测量, 边缘检测

Abstract: Polarimetric synthetic aperture radar interferometry (PolInSAR) data procedures and their application are based on the estimation of polarimetric complex coherence, which are influenced by size of windows and filter methods. In this paper, the adaptive refined Lee filter, which based on traditional refined Lee filter, is used to estimate the interferometric coherence. The size of filter window is changed by the correlation coefficient between the central sub window and the neighboring sub window. Correlation coefficient which is larger than the threshold value means to the homogeneous pixels in the selected window, and then boxcar filter is chosen to estimate complex coherence. When maximum of correlation coefficient in difference windows sizes is smaller than the threshold value, the refined Lee filter is used to estimate the complex coherence. The efficiency and advantage of the new algorithm are demonstrated with E-SAR data sets. The results show that the influence of speckle noise and edge information is improved; more accurate complex coherence estimated by selected window size and selected pixels increase the accurate of forest parameters inversion.

Key words: refined Lee filter, adaptive window, PolInSAR, complex coherence, edge detection

中图分类号:

P237.3

龙江平, 丁晓利, 汪长城. 自适应精致极化Lee滤波的复相干性估计方法[J]. 测绘学报, 2015, 44(12): 1331-1339.

LONG Jiangping, DING Xiaoli, WANG Changcheng. Complex Coherence Estimation Based on Adaptive Refined Lee Filter[J]. Acta Geodaetica et Cartographica Sinica, 2015, 44(12): 1331-1339.

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自适应精致极化Lee滤波的复相干性估计方法

Complex Coherence Estimation Based on Adaptive Refined Lee Filter

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