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. 25, 2000
Filed:
Apr. 13, 1998
Etsuko Himoto, Fukuoka, JP;
Matsushita Electric Industrial Co., Ltd., Osaka, JP;
Abstract
In a color correcting apparatus, transformation errors in an entire color space can be uniformly reduced in response to a characteristic of an input/output appliance, and a high precision color correction can be achieved. A first reference table is formed by storing input color signals produced by reading a reference color chip by using a color image scanner in correspondence with measurement values produced by measuring the reference color chip by employing a calorimeter. A calculation is made of a transformation coefficient for transforming input color signals into measurement values based on the input color signals close to lattice points defined in a color space, and also the measurement values corresponding thereto. The color data of the respective lattice points are corrected by using the transformation coefficient. Then, a second reference table is formed by storing the color data of the lattice points in correspondence with the corrected color data of the lattice points. The color correction process operation is performed for the image data entered from the image input apparatus with employment of the second reference table.