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遥感技术的迅速发展促使图像处理技术日新月异,目前利用光学方法,可以对图像信息进行多种增强处理和多种线性或非线性变换。多波段遥感图像的光学比值图,可以突出不同波段图像之间的差异,增强某些特定的地物信息,如水系,洋流,暗礁,岩层,植被等,对资源普查、环境保护,基建选址,植被分类、灾情估计,地震预测等提供依据。对同一地区不同时期的遥感图像进行比值处理,可以对自然变迁、人工建筑等目标进行动态监测和研究。比值图亦可由电子计算机数字处理方法得到,但光学方法独具二维并行处理能力,容量大,
With the rapid development of remote sensing technology, image processing technologies are rapidly changing. At present, optical methods are used to perform various enhancement processes and various linear or nonlinear transformations on image information. The optical ratio map of multi-band remote sensing images can highlight the differences between the different band images and enhance some specific ground object information, such as water systems, ocean currents, reefs, rock formations and vegetation, etc., to census resources, environmental protection and site selection , Vegetation classification, disaster assessment, earthquake prediction and so on. The ratio of remote sensing images in different periods of the same area can be dynamically monitored and studied for natural transition and artificial construction. The ratio chart can also be obtained by electronic computer digital processing method, but the optical method unique two-dimensional parallel processing capability, large capacity,