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:
Sep. 01, 1987
Filed:
Dec. 23, 1982
Applicant:
Inventors:
Martin N Nelson, Danville, CA (US);
J Kirkwood Rough, San Jose, CA (US);
Assignee:
Other;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H04N / ;
U.S. Cl.
CPC ...
358282 ; 358283 ; 358284 ; 382 53 ;
Abstract
The processing of video signal information derived from scanning the characters or marks on a background sheet includes normalizing the signal levels against changes in operating conditions and dynamically altering the threshold level of the video signal in response to the changes in levels of video signal.