Patents by Inventor Nubuo Ohnuma

Nubuo Ohnuma has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Image processing apparatus and method for performing color correction based on object type of an image
    Patent number: 6118896
    Abstract: A color correction unit for natural images, graphics and characters performs color correction of enlarging regions corresponding to primary colors (R (red), G (green) and B (blue)) and secondary colors (C, M and Y) while maintaining gray balance for R0, G0 and B0 raster image data representing an input object image, to generate C1, M1, Y1 and K1 multivalue density data. A binary-coding processing unit performs binary-coding processing of the C1, M1, Y1 and K1 multivalue density data to generate C2, M2, Y2 and K2 binary density data, and transfers the generated density data to a printer using a centroparallel interface or the like.
    Type: Grant
    Filed: July 31, 1996
    Date of Patent: September 12, 2000
    Assignee: Canon Kabushiki Kaisha
    Inventor: Nubuo Ohnuma