Patent Document ID: 7734115
Application ID: 11526479
Patent Status: 1

Claim One:
1. A method for removing image noise using pattern information, the method comprising the steps of: (a) calculating, by a region dispersion unit, region dispersion value of pixels of the input image using a predetermined pixel size; (b) calculating, by the region dispersion unit, mean brightness of the input image, and calculating noise dispersion value of the pixels of the input image with respect to the input image; (c) switching, by an activity switching unit, each of the pixels between a low frequency and a high frequency based on whether the noise dispersion value of each pixel is larger or smaller than the corresponding region dispersion value; (d) removing, by a first low frequency filtering unit, noise from the pixels having the low frequency based on a statistical characteristic after obtaining a region average determined, by the region dispersion unit, with respect to the switched pixels having the low frequency; and (e) removing, by a second low frequency filtering unit, noise from the pixels having the high frequency resulting from step (d) based on a similarity of pixels after analyzing pixel patterns of the pixels having the high frequency; wherein step (e) further comprises the step of identifying pixels of the image signals with the high frequency having a pattern identical to a current pixel and adding a weight to the identified pixels so as to filter noise.