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. 12, 1992
Filed:
Apr. 09, 1990
Applicant:
Inventor:
Philippe Roth, Danikon, CH;
Assignee:
Gretag Aktiengesellschaft, Regensdorf, CH;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
H04N / ; H04N / ;
U.S. Cl.
CPC ...
358167 ; 358168 ; 358169 ;
Abstract
In a compensation circuit for the correction of image defects of an image projection system according to the control layer principle, in particular of an eidophor projector, a compensation signal is produced from signals associated with three adjacent lines, using an adder followed by a coefficient multiplier in order to produce a compensation signal. The amplitude of the compensation signal assumes a maximum value for low values of an intermediate image point in a single column image matrix of a video signal and a minimum value for high levels of the intermediate image point.