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:
Apr. 23, 2002
Filed:
Oct. 26, 1999
Applicant:
Inventors:
Brian L Hastings, Fort Collins, CO (US);
Dan L Dalton, Greeley, CO (US);
Assignee:
Hewlett-Packard Company, Palo Alto, CA (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G06K 9/32 ; H04N 1/40 ;
U.S. Cl.
CPC ...
G06K 9/32 ; H04N 1/40 ;
Abstract
Moire patterns are significantly suppressed in a scanner that continuously varies its number of lines per inch. The number of dots per inch in the direction different from the relative motion between the scanner and the document is generally a fixed property of the optical sensor, but in the LPI direction the distance between consecutive lines can be made to randomly vary between a maximum distance and a minimum distance. This spatially distributes the moire effect, and prevents its accumulation into the usual recognizable two dimensional pattern.