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. 26, 2006
Filed:
Nov. 24, 2000
Yuki Kakuya, Osaka, JP;
Atsuhisa Kageyama, Ibaraki, JP;
Katsuya Ishikawa, Takatsuki, JP;
Hidetoshi Suzuki, Takatsuki, JP;
Yuki Kakuya, Osaka, JP;
Atsuhisa Kageyama, Ibaraki, JP;
Katsuya Ishikawa, Takatsuki, JP;
Hidetoshi Suzuki, Takatsuki, JP;
Matsushita Electric Industrial Co., Ltd., Osaka, JP;
Abstract
The present invention has an object to provide a gradation correcting apparatus for correcting the gradation of the white side of a video luminance signal. The gradation correcting apparatus is provided with a maximum value detectorfor detecting a maximum value of a luminance signal S, a white comparatorfor comparing the luminance signal S, a maximum luminance value Sdetected by the maximum value detector, and a first white threshold value S, a white linear converterfor performing linear conversion on the luminance signal Son the basis of the maximum luminance value S, the first white threshold value S, and a second white threshold value S, and a white controllerfor correcting the luminance signal Son the basis of the result of the comparison in the white comparator, the output of the white linear converter, and the second white threshold value S