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:
Dec. 04, 1984
Filed:
Apr. 19, 1982
Michael E Wilmer, Portola Valley, CA (US);
Leland D Green, Sierra Madre, CA (US);
Rudiger W Tietze, Altadena, CA (US);
Xerox Corporation, Stamford, CT (US);
Abstract
A video signal white level corrector wherein a digital memory is used to store a correction signal which is applied to a signal multiplier to remove white level shading which results from optic and beam misalignment of a scanner. Video signals are applied to a multiplier 10, the output therefrom being the corrected video signal. The correction signal is stored for future use in a digital memory 14 after being compared to a reference voltage at comparator 20. In a first, or 'store', mode, the output from the comparator 20 is coupled to an integrator 22, the output of which increases or decreases the gain of multiplier 10. In a second, or 'operate', mode, the output from the digital memory is coupled to integrator 22 to also control the gain of multiplier 10.