COMPARATIVE ANALYSIS OF AUTOMATIC DIGITAL IMAGE BALANCING AND STANDARD HISTOGRAM ENHANCEMENT TECHNIQUES IN REMOTE SENSING IMAGERY

Abstract

Recently, radiometric image homogenization techniques have been thoroughly studied among the digital mapping techniques. The main characteristics of digital image balancing methods ⎯ vignetting and hot spot minimization, as well as color homogenization ⎯ were inherited from photo laboratory techniques. However, the current digital image balancing processing uses mathematical modeling of matrices which evaluates the most suitable histogram templates and applies customized corrections to each image region, with or without user intervention. In this paper, we review the main phenomena involved in aerial image quality and outine image correction. Image balancing problems and solutions will focus on digital processing techniques and their applications. The study will also apply an automatic recursive block method and a standard histogram technique to sattelite imagery. The balancing and color adjustment performances are compared.