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:
Jun. 17, 2003
Filed:
Nov. 27, 2000
Matsushita Electric Industrial Co., Ltd., Osaka, JP;
Abstract
The present invention provides a color difference signal correction apparatus for correcting color difference of parts having no color, particularly white characters, which can make the correction with high accuracy also for images including lightly colored parts. The color difference signal correction apparatus of the present invention comprises a full-wave rectification circuit for full-wave rectifying an input color difference signal (R−Y)a, a full-wave rectification circuit for full-wave rectifying an input color difference signal (B−Y)b, an addition circuit for adding the outputs of the full-wave rectification circuit and the full-wave rectification circuit , an addition circuit for adding a white character slice level signal e and the output of the addition circuit , a luminance signal slice circuit for slicing a luminance signal g with the output of the addition circuit , and an addition circuit for adding the output of the luminance signal slice circuit and the input color difference signal (B−Y)b and outputting the addition result.