Patent ID: 6175657
Filing Date: 2001-01-16
Classification: G06T

Abstract:
A method of filtering Gaussian noise contained in a data stream relative to a predetermined field scanned by rows, the method comprising the steps of:storing information of a preceding scanned row defining, together with the data of a row being currently scanned, a bidimensional processing window of a predetermined number of pixels;computing differences between a value of a predetermined pixel of the row being scanned and values of adjacent pixels belonging in the processing window and determining a minimum and a maximum of the computed differences;processing by fuzzy logic the values of the respective pixels of the minimum and maximum differences and of at least one parameter derived from a predetermined sensorial response according to a first membership function, and generating a first weighting coefficient;generating a pair of threshold values of differences according to the first weighting coefficient;processing by fuzzy logic each of computed differences and the pair of threshold values according to a second membership function, producing a corresponding set of weighting coefficients;combining each of said computed differences with a respective one of the set of weighting coefficients; andadding the results of the combinations producing a corrected value of the predetermined pixel.