摘要
针对遥感数字图像对比度较低的特点,本文提出了一种无损的平移双向拉伸图像增强方法。首先根据亮度的均值将图像中的有效像素平移至128,再对遥感数字图像进行无损的双向对比度拉伸,保持了图像的完整性,为遥感图像合成、融合、信息提取及分类奠定了基础。实验表明该方法达到了较好的目视判读的效果,并且适用于多种卫星遥感数字图像的预处理。
A method of lossless enhancement for two-way image stretch translation is proposed while taking the lower image contrast of remote sensing digital image into account.First,parallel move the effective pixel of the image to 128 according to the mean of the brightness,then the lossless two-way stretch for image contrast of remote sensing digital image is done.With this method,the integrity of image is preserved,and the foundation for remote sensing image synthesis,integration,information extraction and classification is laid.A better visual interpretation of the effect with this method is showed by experiments,and the method is also applicable to a variety of satellite remote sensing digital image preprocessing.
关键词
遥感图像增强
无损
对比度拉伸
remote sensing digital image enhancing
lossless
stretching contrast ratio
