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:
Feb. 15, 1994
Filed:
Aug. 24, 1992
Applicant:
Inventor:
Yoshihiro Kishida, Kyoto, JP;
Assignee:
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G06K / ;
U.S. Cl.
CPC ...
382 50 ; 382 54 ; 358527 ; 358466 ;
Abstract
A plurality of reference tone curves are determined in advance. An operator divides an original image into image regions and selects respective reference tone curves (f.sub.1 (x), f.sub.2 (x)) for the image regions. The operator designates weight values for the respective reference tone curves. A weighted average of the respective reference tone values is calculated with the weight values to obtain a tone curve which is then employed to convert the gradation of the original image.