Noise reduction circuit

Details Noise reduction circuit Noise reduction circuit

2006-05-16

2006-05-16

Lee, Michael H. (Department: 2614)

Television

Image signal processing circuitry specific to television

Noise or undesired signal reduction

C348S701000, C382S262000

Reexamination Certificate

active

07046304

ABSTRACT:
A noise reduction circuit comprises correlation value calculation means for calculating correlation values in a plurality of directions centered at a pixel to be corrected; correction amount calculation means for calculating, on the basis of the correlation values in the plurality of directions calculated by the correlation value calculation means, a correction amount corresponding to the pixel to be corrected for each of the directions; first correction value calculation means for producing a plurality of candidates for correction values corresponding to the pixel to be corrected on the basis of the correction amount for each of the directions which is calculated by the correction amount calculation means; and second correction value calculation means for calculating the correction value for the pixel to be corrected from the plurality of candidates for correction values corresponding to the pixel to be corrected which are produced by the first correction value calculation means.

REFERENCES:
patent: 5142537 (1992-08-01), Kutner et al.
patent: 5231680 (1993-07-01), Williams
patent: 5490094 (1996-02-01), Heimburger et al.
patent: 5521989 (1996-05-01), Fan
patent: 5715335 (1998-02-01), De Haan et al.
patent: 5825429 (1998-10-01), Shirahata
patent: 5889890 (1999-03-01), Heimburger

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