Impulse noise reduction apparatus and method

Details Impulse noise reduction apparatus and method Impulse noise reduction apparatus and method

1998-08-13

2000-10-24

Rogers, Scott

Image analysis

Image enhancement or restoration

Image filter

382262, 382260, 382261, 382275, 382272, G06T 500, G06K 940

Patent

active

061379174

ABSTRACT:
An apparatus and method of reducing impulse noise using a median filter involve selecting a pixel of median.sub.-- value from a plurality of pixels, comparing a reference range, determined by adding or subtracting an offset value to or from the selected median.sub.-- value, with a mid.sub.-- pixel among the plurality of pixels, to determine whether the input image signal has impulse noise and generate a noise coefficient depending on the presence of impulse noise, calculating a correlation between the luminance component of a pixel and the color component thereof depending on the noise coefficient, and cross-fading the pixel of median.sub.-- value and the mid.sub.-- pixel depending on the correlation.

REFERENCES:
patent: 4782389 (1988-11-01), Mayweather, III et al.
patent: 4827533 (1989-05-01), Tanaka et al.
patent: 5148278 (1992-09-01), Wischermann et al.
patent: 5327240 (1994-07-01), Golston et al.
patent: 5787203 (1998-07-01), Lee et al.
patent: 5798846 (1998-08-01), Tretter et al.

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