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:
Apr. 10, 2001
Filed:
Mar. 05, 1998
Hiroko Sugimoto, Hirakata, JP;
Atsuhisa Kageyama, Ibaraki, JP;
Masahiro Takeshima, Takatsuki, JP;
Minoru Kawabata, Takatsuki, JP;
Matsushita Electric Industrial Co. Ltd., Osaka, JP;
Abstract
Aiming to improve color reproducibility of a red part having high color saturation, a gamma compensation apparatus of the present invention is composed of a bending point setting block,and a gamma compensation block,and bending point setting block,is composed of a high APL detection circuit,inputting an average picture level of an input luminance signal and for detecting and taking out a signal component higher than a designated level; a gain controller,for gain controlling the detected signal at the high APL picture detection circuit; and an adder,for adding a designated offset to the output of gain controller,, and gamma compensation block,is composed of a slice circuit,inputting a color difference signal (R-Y) and the output of bending point setting block,and taking out a color difference signal component higher than the output signal level of bending point setting block,; a gain controller,for adjusting the output level of slice circuit,; and a subtracter,for subtracting the output of gain controller,from the input color difference signal (R-Y) and outputting a gamma compensated color difference signal (R-Y)′.