Structure and method for reducing spatial noise

Television – Image signal processing circuitry specific to television – Noise or undesired signal reduction

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348625, 382261, H04N 521

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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.

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