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:
Feb. 04, 1992
Filed:
Dec. 27, 1990
Applicant:
Inventors:
William L Kelly-Mahaffey, Austin, TX (US);
James M Stafford, Round Rock, TX (US);
Assignee:
International Business Machines Corporation, Armonk, NY (US);
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
G06K / ;
U.S. Cl.
CPC ...
382-8 ; 382 22 ; 382 48 ; 358101 ;
Abstract
A method is disclosed for determining the presence and position of fiducials on the surface of a printed circuit substrate in grey level images to sub-pixel accuracy. A summation profile technique is utilized to decrease the amount of computation required and thereby increase throughput for enabling real time operation in a total component placement system.