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

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

Laser cleaning and dressing of vitrified grinding wheels

Grinding is an industrial process that produces engineering components with a desired surface finish. Prior to the development of continuous dressing operations, the grinding efficiency of vitrified grinding wheels deteriorates as the sharp cutting edges become blunt due to the formation of wear flats. Dressing is essentially a sharpening operation designed to generate a specific topography on the working surface of the grinding wheel. The use of high power lasers is being explored as a non-contact cleaning and dressing technique. In the present study, a high power laser was used to clean metal chips from the surface of the grinding wheel and to dress the wheel by causing phase transformations to occur on the surface of vitrified grinding wheel. Experimental results indicated that laser modified grinding wheels are comparable in performance to conventionally cleaned and dressed grinding wheels