An image enhancing process promotes either noise reduction or image sharpening on a pixel-by-pixel basis as a function of the recognition of specific patterns of sampled pixel values surrounding each pixel to be enhanced. The sampled pixel values are divided into two or more subgroups and the enhanced...http://www.google.com/patents/US4783840?utm_source=gb-gplus-sharePatent US4783840 - Method for enhancing image data by noise reduction or sharpening
