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:
Oct. 14, 2003
Filed:
Oct. 19, 1999
Hirochika Matsuoka, Yokohama, JP;
Canon Kabushiki Kaisha, Tokyo, JP;
Abstract
A process that prepares inverse conversion data in advance, and inversely converts a signal in a given color space into that in an original color space suffers conversion accuracy variations depending on the spatial intervals of color signals upon preparing the inverse conversion data, requires high cost for inverse conversion in terms of time, resulting in poor efficiency. When an input signal in the Lab color space is converted into an output signal in the RGB color space, a color signal converter ( ) converts an input signal in the RGB color space into a signal in the Lab color space. A potential calculator ( ) extracts the difference between the input signal and the color signal output from the color signal converter ( ). A minimal potential search unit searches for a signal to be supplied to the color signal converter ( ), which makes the extracted difference minimal, and outputs the search result as a color signal in the RGB color space, i.e., the conversion result.