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:
Jun. 29, 1982
Filed:
Jan. 02, 1981
Applicant:
Inventor:
William R Smith, Mountain View, CA (US);
Assignee:
Caere Corporation, Los Gatos, CA (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G06K / ;
U.S. Cl.
CPC ...
3401 / ;
Abstract
An apparatus for processing video signals received from an optical scanner is described. A comparator means is used for comparing the video signals with a dynamic threshold voltage. This threshold voltage is generated by a peak detector circuit which also receives the video signals. The peak detector circuit includes decay means for decaying signals representative of the detected peaks at a predetermined rate. This thresholding technique provides compensation for a wide dynamic range of video signals received from a photodiode array.