光学遥感图像中光斑区的出现是不可避免的,以MODIS为代表的中分辨率光学遥感器具有更宽的覆盖宽度,其耀斑区范围更大。耀斑区虽然对于传统的水色遥感是噪声,但对于海洋内波等动力过程的观测却是非常有益的。由于耀斑区的亮度远大于其它,因此为了观测整景图像范围的内波需要进行均衡化处理。本文以MODIS图像为例,发展了基于多项式函数的拟合方法,较好的实现了图像的均衡化处理,处理后的图像亮度变化均匀,可以清楚的观测整景图像各个部分的内波,而不需要逐一进行图像增强。

Sun glitter is inevitable in optical remote sensing images.The large swath of the moderate resolution spectral sensors,such as MODIS,leads to large sun glitter coverage.Although considered to be noise in traditional ocean color remote sensing,sun glitter benefits the observation of internal waves and other ocean dynamic processes.Equalization is required to observe the internal waves in the whole scene due to the sun glitter appears brighter than the other parts of the image.The method of polynomial fitting is proposed and realizes the image equalization for MODIS images in the paper.The processed images turn on even brightness and internal waves at any corner in the scene are clearly seen.Image enhancement for separate parts is no longer necessary.