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:
Mar. 16, 1976
Filed:
May. 21, 1974
Thomas G Holmes, Melbourne, FL (US);
Kenneth L Seib, Melbourne, FL (US);
Optical Business Machines, Melbourne, FL (US);
Abstract
A threshold level is automatically varied to follow variations in an input signal reference level. In the disclosed embodiment the reference level is that produced by photodiode-amplifiers in an OCR machine when viewing white or non-character portions of a page, the reference level varying as a function of the change in the length of the optical path during a scan across the page. The threshold level is compared to the input signal level to determine whether a character segment is viewed by the photodiode. Variation of the threshold level is achieved by low pass filtering individual output signals from some of the photodiode-amplifiers and then averaging the filtered signals to provide the adjusted threshold.
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile