"atmospheric" Correction of Digital Colour Images Based on Luminance Ratio Consideration

Colour images change their appearance with increasing flying height: they are affected by an increasing bluish tint. This phenomenon is primarily the result of Rayleigh scattering. Considerations concerning a correction of the atmospheric effect lead to the investigation reported herein. The chosen approach originating from the areas of reprographic technique and photographic tone reproduction. Atmospheric data are not required. It will here be assumed that the illuminance E’ for the image forming light is equals to the luminance L. Flare light can be specified in various ways: as illuminane ratio