The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Dec. 22, 1992
Filed:
Jun. 06, 1990
Philip R Rigg, Saratoga, CA (US);
Neil Baumgarten, Weston, MA (US);
ElectroScan Corporation, Wilmington, MA (US);
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.