Television – Image signal processing circuitry specific to television – Noise or undesired signal reduction
Patent
1995-09-11
1998-12-01
Hsia, Sherrie
Television
Image signal processing circuitry specific to television
Noise or undesired signal reduction
348625, 382261, H04N 521
Patent
active
058446273
ABSTRACT:
A digital filter for noise reduction selects between local variances obtained from adjacent pixels in the same frame and adjacent pixels in the same field. In one embodiment, the digital filter includes a filter modified from an adaptive Wiener filter which preserves edges and smoothes smooth areas of the image. A high compression ratio can be achieved in very smooth regions of the image without introducing artifacts.
REFERENCES:
patent: 4612575 (1986-09-01), Ishman
patent: 5045945 (1991-09-01), Herman
Article entitled "Digital Image Enhancement and Noise Filtering by Use of Local Statistics", Jong-Sen Lee, IEEE Transactions on Pattern Analysis and Machine Intelligence, vol. PAMI-2, No. 2, Mar. 1980, pp. 165-168.
Article entitled "Refined Filtering of Image Noise Using Local Statistics", Jong-Sen Lee, Computer Graphics and Image Processing, vol. 15, No. 4, Apr. 1981, pp. 380-389.
Article entitled "Adaptive Noise Smoothing Filter for Images with Signal-Dependent Noise", Darwin T. Kuan, Alexander A. Sawchuk, Timothy C. Strand and Pierre Chavel, IEEE Transactions on Pattern Analysis and Machine Intelligence, vol. PAMI-7, No. 2, Mar. 1985, pp. 165-177.
Fritsch Jean-Georges
May William
Hsia Sherrie
Kwok Edward C.
Minerya System, Inc.
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