Apparatus and method for improving the signal-to-noise ratio of

Details Apparatus and method for improving the signal-to-noise ratio of Apparatus and method for improving the signal-to-noise ratio of

1990-06-06

1992-12-22

Groody, James J.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358166, H04N 5217

Patent

active

051737760

ABSTRACT:
An apparatus and method for continuously improving the signal-to-noise ratio of a stationary video image by digital integration, without the loss of signal amplitude incurred by conventional designs. The apparatus includes a sampling analog-to-digital converter for digitizing an input video signal frame which is supplied to a calculating device along with a preceding video signal frame supplied from the output of the calculating device through a memory device. These features, in conjunction with other digital logic components, form a digital recusive filter. The calculating device sums new and previously stored data for each pixel in amounts scaled to counteract the loss of signal range that occurs as the random-noise component averages to zero. By appropriate selection of operating parameters, the method can be used to maintain or even boost the amplitude of a video signal while simultaneously enhancing its signal-to-noise ratio.

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