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. 23, 1997
Filed:
Nov. 06, 1995
Kazuhiko Nishiwaki, Kanagawa, JP;
Ken Nakajima, Tokyo, JP;
Sony Corporation, Tokyo, JP;
Abstract
A gamma correction circuit capable of faithfully monitoring and outputting the color and luminance of an object without deteriorating the resolution. The gamma circuit includes an output-picture luminance signal generator for converting supplied color picture signals into luminance signals and for gamma-correcting the luminance signals for generating output-picture luminance signals, a low-pass filter for transmitting low-frequency components of the supplied picture signals, a luminance correction signal generator for generating a luminance correction signal by subtraction between a signal obtained on gamma-correcting picture signals supplied from the low-pass filter and converting the gamma-corrected picture signals into luminance signals and a signal obtained on converting the picture signals into luminance signals and gamma-correcting the luminance signals, an output-picture luminance signal correction unit for correcting the output-picture luminance signal based upon the output-picture luminance signal and the luminance correction signal, and a color difference matrix circuit for effecting chroma-conversion of the gamma-corrected picture signals supplied from the low-pass filter.