A novel fuzzy approach for enhancement of uneven illuminated images

Uneven illumination occurs due to the non-uniform lighting directions so the captured images have some dark areas as well as bright areas. The darker areas must be brightened and bright areas should be a little darkened to make the image uniform. The color image is converted into RGB luminance. RGB Luminance is converted into the fuzzy plane and the fuzzy entropy is used to quantify the level of enhancement. The RGB color channels are modified as per the modification ratio of RGB luminance. The proposed scheme is compared with the methods which work in the spatial domain as well as in the fuzzy domain. The supremacy of the proposed approach is proved by evaluating the visual image quality.