Method for filtering image noise using pattern information

Details Method for filtering image noise using pattern information Method for filtering image noise using pattern information

2006-09-25

2010-06-08

Couso, Yon (Department: 2624)

Image analysis

Image enhancement or restoration

Artifact removal or suppression

C382S261000

Reexamination Certificate

active

07734115

ABSTRACT:
Disclosed is a method for removing image noise using pattern information, which filters noise caught by a sensor during preprocessing of a compression codec, so as to increase a compression efficiency, and noise caused by the codec during post-processing of the codec, so as to obtain high quality images. The method includes the steps of: (a) carrying out region dispersion with respect to input image signals so that the image signals are dispersed with a predetermined pixel size; (b) calculating mean brightness of the input image signals and carrying out noise dispersion with respect to the input image signals; (c) switching a low frequency and a high frequency based on image signals which are subjected to the region dispersion and the noise dispersion; (d) removing noise based on a statistic after obtaining the region average with respect to the image signals having the low frequency; and (e) removing noise based on a similarity of pixels after analyzing patterns with relation to the image signals having the high frequency.

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