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:
Aug. 17, 1982
Filed:
Nov. 19, 1980
Applicant:
Inventors:
Robert C Melamud, Tokyo, JP;
James D Nihart, Harrisburg, NC (US);
James M White, Charlotte, NC (US);
Assignee:
International Business Machines Corporation, Armonk, NY (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H04N / ; G06F / ;
U.S. Cl.
CPC ...
364515 ; 358166 ; 358282 ; 358284 ;
Abstract
A two-dimensional history of reflectance values, from which black-white threshold decisions are made, is stored in a relatively small amount of memory. Updating of the history by non-linear functions is accomplished through the use of look-up tables.