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:
Aug. 25, 1992
Filed:
Dec. 18, 1990
Shigeo Suzuki, Saitama, JP;
Fujio Okada, Saitama, JP;
Fuji Photo Optical Co., Ltd., Saitama, JP;
Abstract
A signal level correction circuit for a video signal includes a voltage control amplifier for amplifying a video signal received from a solid state image sensor with different gains for the respective chrominance signals, a first clamp circuit for setting a black level in the video signal received from the amplifier, a comparator for outputting a voltage proportional to the difference between a peak holding voltage of a capacitor in the horizontal blanking period of the video signal clamped by the first clamp circuit, and a reference voltage. An adder adds the output voltage from the comparator and the video signal from the first clamp circuit. A second clamp circuit resets the black level of the amplified video signal. A .gamma. correction circuit adjusts the .gamma. value of the video signal from the second clamp circuit. A clipping circuit clips the dynamic ranges between the white and black level of the .gamma. value corrected video signal. A third clamp circuit resets the black level of the video signal from the clipping circuit. An A/D converter converts the analog video signal into a digital signal.
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile