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:
Sep. 07, 1993
Filed:
Apr. 29, 1991
Applicant:
Inventors:
Hideaki Murayama, Kanagawa, JP;
Isamu Yamamoto, Kanagawa, JP;
Assignee:
Sony Corporation, Tokyo, JP;
Attorneys:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
H04N / ;
U.S. Cl.
CPC ...
358164 ; 358 32 ;
Abstract
A gamma correction circuit converts digital video data to address data, reads out slope and intercept data for segments of a polygonal line approximation of a desired gamma correction characteristic stored at the address, and uses the read out data to generate a gamma corrected output video signal. Another gamma correction circuit directly uses digital video data to address previously stored level correction data, then uses the level correction data and a coefficient K to generate a gamma corrected output video signal.