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:
Mar. 02, 1993
Filed:
Dec. 16, 1991
William A Lagoni, Indianapolis, IN (US);
Robert L O'Brien, Indianapolis, IN (US);
Thomson Consumer Electronics, Inc., Indianapolis, IN (US);
Abstract
A non-linear (e.g., 'white stretch') processor and a brightness control processor are coupled in cascade between an input for receiving a video input signal to be processed and an output for providing a processed video output signal. A control signal for controlling the transfer characteristics of the non-linear processor is provided by an amplifier having a first input coupled to receive an average picture level (APL) indicating signal derived from the processed video output signal and having a second input coupled to receive a reference level signal supplied thereto. A brightness control signal is applied to a control input of the brightness control processor for controlling the brightness level of the processed video output signal. Circuit means are provided for deriving at least a portion of the reference level signal for the amplifier from the brightness control signal supplied to the brightness control processor thereby reducing a tendency for variations in the brightness control signal to alter the transfer characteristics of the non-linear processor.