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:
May. 28, 1991
Filed:
Aug. 08, 1988
Thomas K Lo, Temple City, CA (US);
Jack M Sacks, Thousand Oaks, CA (US);
Wayne P Simoni, Canoga Park, CA (US);
Leonard A Lee, Canoga Park, CA (US);
Harrison Nguyen, Ontario, CA (US);
Lynne M Karlin, Northridge, CA (US);
Andy L Quan, Canogo Park, CA (US);
Kazuo R Hosokawa, Canogo Park, CA (US);
Hughes Aircraft Company, Los Angeles, CA (US);
Abstract
A method and apparatus for correlating two signals representing a live image and a reference image are disclosed. The reference signal is processed to provide a polarity bit and mask bit for each pixel position in the reference image. The processed video signal is stored in a memory 20 and used in a convolver and summer section 18 in which the polarity bits between the reference and live images are gated by gate 17 and are used in generating a correlation output from summer 23. However, the polarity bits do not affect the correlation output if the logical output from gate 19 is of a given state which occurs if the associated mask bits indicate that the gradient value at the particular pixel position does not exceed certain minimum threshold values.