Hue image RGB colour composition. A simple technique to suppress shadow and enhance spectral signature

Publisher Website
Google Scholar
Abstract
A hue image derived from three multi-spectral image bands by a RGB-IHS (red, green and blue to intensity, hue and saturation) transformation is shadow free because the pixel values in a hue image are independent of illumination and are related to only the shapes of the spectral signatures of the three bands. Three hue images derived from three different band triplets of a multi-spectral image, when displayed as a colour composite, form a strongly coloured, shadow-free image termed a hue red/green/blue (HRGB) colour composite image. The colours in this image are determined by the shapes of the spectral signatures of all the bands used and the spectral information of up to nine bands can be encoded into one colour image. Field checks and comparison with a published geological map have shown that geological interpretation of a HRGB image derived from a Landsat Thematic Mapper (TM) image of a semi-arid area in south east Spain accurately reveals the distribution of major rock types and hydrothermal alteration zones associated with a gold deposit.

This publication has 2 references indexed in Scilit: