Fuzzy logic filter for impulsive noisy images

Details Fuzzy logic filter for impulsive noisy images Fuzzy logic filter for impulsive noisy images

1995-10-30

2000-03-07

Grant, Chris

Television

Image signal processing circuitry specific to television

Noise or undesired signal reduction

382261, H04N 521

Patent

active

060347414

ABSTRACT:
A filter performs a reduction of pulsed noise in video images in accordance with fuzzy logic. An interface circuit of the filter receives consecutive digital signals in time corresponding to the video images and generates an image window having a digital signal to be processed at the center. The filter also has a comparator block, a plurality of digital subtractors, and a memory circuit connected in cascade to the comparator block. The filter also has a filtering circuit that organizes values of digital signals of the video image, and an arithmetic block that performs a switch between the digital signal to be processed and the output of the filtering circuit on the basis of the values taken by the parameter.

REFERENCES:
patent: 5245445 (1993-09-01), Fujisawa
patent: 5621474 (1997-04-01), Mancuso et al.
patent: 5659370 (1997-08-01), Mancuso et al.
European search report from European Patent Application 94830521.4, filed Oct. 31, 1994.
Patent Abstracts of Japan, vol. 17, No. 445 (P-1539) Aug. 16, 1993 & JP-A-05 094 523 Yokogawa Medical Syst Ltd.
Patent Abstract of Japan, vol. 17, No. 427 (E-1413) Aug. 12, 1993 & JP-A-05 091 532 (Toshiba Corp).

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