一种推扫式卫星图像的相对辐射校正方法  

A Relative Radiometric Correction Method for the Scanning Image of Pushbroom Satellite

作　　者：李海超[1] 郝胜勇[1] 

机构地区：[1]北京卫星信息工程研究所,北京100086

出　　处：《光电工程》2011年第1期142-145,150,共5页Opto-Electronic Engineering

基　　金：863计划资助项目(2009AA12Z149)

摘　　要：由于推扫式成像卫星的各探元之间存在一定的响应差异,因此推扫生成的遥感图像在推扫方向上往往存在明显的条带现象。本文提出一种基于自适应滤波模板的推扫式卫星图像的相对辐射校正方法,首先,根据条带分布情况选择合适的一维非线性滤波器去除比较明显的条带噪声;然后,利用一维平滑滤波计算每个探元的增益和偏置等相对辐射校正系数;最后,利用校正系数去除细条带噪声。实验表明,该方法能够有效改善图像质量,使推扫方向的条带噪声得到有效去除,并且保留了图像细节信息。Because of the difference response among the detectors in the pushbroom satellite, striping is an obvious phenomenon in the remote sensing image along the scanning direction. A relative radiometric correction algorithm is put forward based on the adaptive filtering pattern. Firstly, the suitable 1-D nonlinear filter is chosen to remove the obvious striping according to the image striping distribution. Then, the 1-D smoothing filter is used to calculate the gain and offset coefficients. At last, the thin stripping is destriped with the obtained coefficients. The comparison experiment proves that the algorithm can effectively improve the image quality, and remove the stripping along the scanning direction, at the same time it preserves the image detail.

关 键 词：推扫式卫星 遥感图像 相对辐射校正 图像条带噪声 一维滤波 

分 类 号：TP751[自动化与计算机技术—检测技术与自动化装置]