“A Review on Design and Implementation of Image Enhancement for Underwater Image”

Abstract

For the Underwater image, currently the gathered images have different grades of distortion and wrong information due to the influence of underwater special environment. There are two basic process for light propagation in the sea water; Absorption and disperses .The process of the light in water can affect the overall performance of underwater imaging system. The above characteristics lead to uneven illumination, low contrast of image and poor quality of the image. For underwater images de noising, a new method based on adaptive wavelet is proposed. Finally the simulation results show that the proposed work not only eliminate the noise effectively but also improves image output peak signal-to-noise ratio (PSNR).Then after Enhancement algorithms which is generally interactive and application dependent is to bring out detail that is hidden part in an image is covered up in a picture or to increases contrast in a low contrast picture. Image enhancement is useful in feature information, image study and visual information display. It simply emphasizes certain specified image characteristics. In this paper an efficient image enhancement algorithm i.e., pre processing, thresholding, contrast adjustment, power law transform is implemented on Spartan -3 FPGA.