Colour image enhancement by hybrid approach

This paper introduces a novel image enhancement methodology driven by both global and local processes. This methodology, based on the parameters controlled hybrid approach which integrates the advantages of point operations with local enhancement techniques, can enhance, simultaneously, the overall contrast and the sharpness of an image and increase, especially, the visibility of specified portions or aspects of the image. The methodology was compared with other classical image enhancement techniques, such as linear contrast stretching and histogram equalization. Results obtained in terms of subjective evaluation have shown the superiority of the proposed approach.