Abstract

CONTRAST ENHANCEMENT OF SPORTS IMAGES

DR. G. NALLAVAN

Volume: 5 Issue: 2 2015

Abstract:

In this paper two comparative approaches for the contrast enhancement of dark sports images. The contrast of any image is a very important characteristic which decides the quality of image. Low contrast images occur often due to poor or non uniform lighting conditions and sometimes due to the non linearity or small dynamic range of the imaging system. Enhancing the contrast of sports images is of importance since it is difficult to analyse the performance of the team or player with a poor quality image. Though several methods are proposed for gray scale images, enhancing the contrast of colour images is a complicated process. In this paper we have proposed two comparative approaches for the contrast enhancement of colour images and have compared their performance against the standard histogram equalization method. First method is contrast enhancement of colour images using fuzzy rule based method and the second method is using modified sigmoid function. Colour images cannot be processed directly hence a suitable color model is chosen for processing and the proposed methods are implemented. For both the approaches the color images are split into RGB planes and the proposed operation is performed on each plane and finally the planes are concatenated to obtain the enhanced image. Performance of the proposed methods is measured using a factor known as Measure of Contrast and the comparison is represented graphically. Experimental results prove that of the two methods proposed, contrast enhancement using modified sigmoid function provides the highest measure of contrast and can be effectively used for further analysis of sports colour images.

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