全景扫描图像系统几何畸变特征及其校正

FEATURES AND CORRECTION OF THE SYSTEMATIC DISTORTION IN PANORAMIC SCANNER IMAGERY

在简述遥感图像的几何畸变特征的基础上，本文着重讨论了包括陆地卫星多光谱扫描图像 （Ｌａｎａｓａｔ－ＭＳＳ）、陆地卫星专题制图仪图像（Ｌａｎｄｅｓａｔ－ＴＭ）和航空多光谱扫描图像在内的各类 全景扫描图像（ｐａｎｏｒａｍｉｃ ｓｃａｎｎｅｒ ｉｍａｇｅ）系统几何畴变的成因、大小及其变化规律，提出了定 量计算图像上任一像元处系统几何畴变量Ｄ的计算公式。 本文探讨了全景扫描图像系统几何校正的基本原则，并根据这些基本原则，用Ｆｏｒｔｒａｎ语言编 制了可直接用于校正各类全景扫描图像系统几何畸变的实用程序。 用该程序对德国南部某地的航空多光谱扫描图像实施系统几何校正的结果表明，偏离航线不 同距离各部位影像的系统几何畸变均得到合理校正，图像上由于全景扫描造成的不程度的压缩现 象均得到相应的补偿。

After briefly describing the features of geometric distortions in remote sensing imagery the emphasis of this paper is placed on the discussion of the sources, extent and variations of systematic distortions in panoramic scanner images, including Landsat-TM, Landsat-MSS and aerial multispectral scanner images. To calculate quantitatively the distortion extent D, a formula is proposed. An example using the aerial multispectral scanner image from southern Germany shows that the systematic distortions in different parts of the image can be corrected satisfactorly and the edge compression can be compensated relevantly also.