Enhancement of Underwater Images using Improved CLAHE

Basically, the contrast and sharpness of the images captured in underwater will be significantly deteriorated and diminished caused by the less perceptibility of the image which is due to the water medium's physical properties. In this work, Improved version of CLAHE mechanism is used. In this technique, First of all input color image gets enhanced by using dynamic histogram equalization technique and then apply CLAHE technique to improve contrast of an input image. DHE technique enhances an input image without loss of imput image details. Proposed experimental results show that the accuracy of proposed technique is much more better than the previously proposed technique(Tri-threshold based fuzzy intensification operator) for under water images in terms of PSNR and entropy value.