CONTENT-BASED GAUSSIAN NOISE REDUCTION FOR STILL IMAGE, VIDEO AND FILM

摘要

A noise filtering technique for reducing noise in an image comprised of an array of pixels achieves strong filtering over smooth areas and less filtering over rich edge areas. The technique commences by defining an M x N neighborhood of pixels for a selected pixel, where M and N are integers. The technique also includes the step of establishing a local filter strength for the selected pixel in accordance with its local variance, and filtering the selected pixel to reduce noise in accordance with its established local filter strength.