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. 08, 1981
Filed:
May. 15, 1980
Heinz Hess, Weiterstadt, DE;
Reinhard Kirschenstein, Rossdorf, DE;
Robert Bosch GmbH, Stuttgart, DE;
Abstract
A contrast correction signal is generated to compensate for the limited contrast range of known image converters. The one of the primary color signals having the highest luminosity is low-pass filtered, its amplitude indicative of darker picture portions boosted, by use of a nonlinear amplifier, the resultant signal is subtracted from a blanking signal which has been subjected to the same nonlinear amplification and the resultant difference signal is multiplied by the composite television signal. The multiplier output constitutes the correction signal which is added to the composite color television signal. The method and system are illustrated with respect to the PAL, NTSC and SECAM systems.