Contrast enhancement of colour digital images
Miodrag Regodić, Ljubomir Gigović, Zoran J. Bajić, Slavko Vasiljević · Tehnicki vjesnik - Technical Gazette · 2017
Preliminary communicationThe main parts of digital images processing are procedures that improve the images quality which does not improve information content, but ensures that the image is visually better and more suitable for display.That is achieved through improved contrast, noise removing, sharpening and colouring pictures.Contrast is the rate of frequency changes in illumination and recording the difference between light and dark elements of the image in the brightness level.Contrast is the difference between two adjacent surfaces' brightness.Absolute value of the brightness of an object is of less importance than the relative brightness (contrast).Objects that have the same objective value of luminance may cause differences in the subjective sense of brightness depending on the contrast.This paper presents the improvement of the digital images quality in colour, which are the result of volcanic activity recording in the infrared region of the electromagnetic energy spectrum, with the application process to improve the contrast of images.High-quality digital images of the volcano were treated in high spatial resolution, which enabled the successful application of MATLAB and the results were very clear, precise and expressive images.