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:
Jan. 26, 1999
Filed:
Feb. 19, 1997
Hiroshi Miyanari, Kawasaki, JP;
Canon Kabushiki Kaisha, Tokyo, JP;
Abstract
A distance measuring apparatus in which two, right and left optical systems respectively comprise sensors (5, 6) is disclosed. Sensor output values (35, 36) representing received-light images (31, 32) on the sensors (5, 6) suffer variations due to sensitivity differences between the sensors (5, 6). In order to correct the variations, the minimum values (RD.sub.L, RD.sub.R) of the two sensor output values are normalized to zero level, and thereafter, the smaller maximum value (e.g., S.sub.R) is normalized to the larger maximum value (e.g., S.sub.L). The correlation calculation is made on the basis of the two normalized sensor outputs to calculate the distance to the object to be measured.