Weighted absolute difference based noise reduction method...

Image analysis – Image enhancement or restoration – Image filter

Reexamination Certificate

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C348S607000

Reexamination Certificate

active

11462968

ABSTRACT:
The invention is a method and apparatus for reducing noise in an image. The method and apparatus involves calculating a plurality of directional operators, comparing the directional operators to a predetermined threshold, and applying a filter responsive to the comparing. The method and apparatus computes the directional operators by taking a weighted sum of the absolute differences between a target pixel and its surrounding pixels. The comparison signals to the method or apparatus the existence of a line or edge. If the method or apparatus detects no edge or line, the method applies a smoothing or averaging filter. If the method or apparatus detects an edge or line, the method applies a median filter in the direction with a minimum directional difference.

REFERENCES:
patent: 4734770 (1988-03-01), Matsuba
patent: 4827533 (1989-05-01), Tanaka
patent: 4937667 (1990-06-01), Choquet et al.
patent: 4967271 (1990-10-01), Campbell et al.
patent: 4982280 (1991-01-01), Lyon et al.
patent: 5019903 (1991-05-01), Dougall et al.
patent: 5070403 (1991-12-01), Wilkinson
patent: 5245677 (1993-09-01), Lepore et al.
patent: 5339109 (1994-08-01), Hong
patent: 5347559 (1994-09-01), Hawkins et al.
patent: 5475438 (1995-12-01), Bretl
patent: 5519451 (1996-05-01), Clatanoff et al.
patent: 5532751 (1996-07-01), Lui
patent: 5592231 (1997-01-01), Clatanoff et al.
patent: 5594816 (1997-01-01), Kaplan et al.
patent: 5786862 (1998-07-01), Kim et al.
patent: 5796437 (1998-08-01), Muraji et al.
patent: 5844614 (1998-12-01), Chong et al.
patent: 5943099 (1999-08-01), Kim
patent: 5959693 (1999-09-01), Wu et al.
patent: 6055018 (2000-04-01), Swan
patent: 6061100 (2000-05-01), Ward et al.
patent: 6067125 (2000-05-01), May
patent: 6072531 (2000-06-01), Shibano
patent: 6094508 (2000-07-01), Acharya et al.
patent: 6118488 (2000-09-01), Huang
patent: 6181382 (2001-01-01), Kieu et al.
patent: 6222589 (2001-04-01), Faroudja et al.
patent: 6229578 (2001-05-01), Acharya et al.
patent: 6512550 (2003-01-01), De Garrido et al.
patent: 6859235 (2005-02-01), Walters
patent: 2002/0075400 (2002-06-01), Shin et al.
patent: 2003/0081144 (2003-05-01), Mohsenian
T. Doyle;Interlaced to Sequential Conversion for EDTV Applications; 1988; pp. 421-430.

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