合成孔径雷达图像辐值校正和几何校正的探讨

数字镶嵌是一种常用的数字图像处理技术。然而,用常规的数字镶嵌技术(利用地面控制点) 镶嵌合成孔径雷达图像并不理想。因为侧视雷达图像的畸变(几何和辐值)都与射束方向距离有 关。当相邻航带图像拼接时,图像色调和几何位置偏差较大。本文解决了侧视雷达图像数字镶嵌 中的问题；详述了雷达图像辐值校正和几何校正方法的数学理论；实例证明了校正方法是有效的。 通过对侧视雷达图像进行合适的辐值校正和几何校正后,就能获得色调均匀、位置准确的镶嵌图像。

A DISCUSSION ON THE RADIATION VALUE CORRECTION AND GEOMETRIC CORRECTION FOR SAR IMAGES

Digital mosaic technology is a common method used in digital image processing, but it is not good enough in SAR image inlay because the(geometric and radiation) distortion of SAR images is related to the direction and distance of radar beam. When the neighbouring image strips were inlaid, the obvious difference between them in tone and geometric position appeared. In this paper it will be found that the problem in digital mosaic of SAR images was solved. The mathematic theory of SAR image radiation correction and geometric correction was discussed in detail, and the effectiveness of the correction methods was approved by examples. The mosaic images with uniform tone and accurate position can be obtained after the suitable radiation correction and geometric correction for SAR images.