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:
Aug. 24, 1999
Filed:
Jun. 21, 1994
Canon Kabushiki Kaisha, Tokyo, JP;
Abstract
An object of this invention is to improve the operability of color adjustment by using a simple hardware arrangement which performs only a matrix arithmetic operation having matrix coefficients properly determined in accordance with adjustment amounts designated from an operation unit for adjusting three variables as lightness, saturation, and hue. In the constitution of this invention, an image input unit inputs a color input signal, and a color conversion unit extracts the minimum value from the input color signal for each pixel, obtaining a difference signal of the input color signal and the extracted minimum value signal. The obtained difference signal is converted in matrix in accordance with matrix conversion coefficients generated by a matrix conversion coefficient unit in correspondence with the adjustment amounts of the adjustment items of an operation unit for adjusting three variables as lightness, hue, and saturation.