相对辐射校正是多时相遥感图像处理和分析的前提.本文分析了几种常规的相对辐射校正方法的优缺点,然后在此基础上提出了一种基于小波变换的遥感图像相对辐射校正方法.该方法对源图像小波变换域的低频成分实施辐射变换,并保持高频成分不变,重构的图像具有保持高频信息的特性,因而能够较好地保留源图像中由于地物变化引起的辐射差异.

The relative radiometric correction is the first step of processing and analyzing of multitemporal remote sensing images. In this paper, a new method based on wavelet transform is proposed on the basis of a through study on the three traditional ones. This new method was implemented by doing relative radiometric correction only on the low frequency component of wavelet transform domain of the source image, and just remaining the high frequency components unchanged. The reconstructed image has the characteristic of keeping the high frequency information, so the radiometric diversities in the source image due to ground changes are reserved.