Patents by Inventor Shohei Tsutsumi

Shohei Tsutsumi 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).

  • Patent number: 6652059
    Abstract: In a printing apparatus which performs printing by moving a printhead having a plurality of printing elements arrayed in a predetermined direction, relatively to a printing medium, whether input pixel data is pixel data to be printed by a printing element which cannot print normally is determined. Input multilevel data of each pixel is converted into data of a smaller number of gray levels than the number of input gray levels. The difference between input data and quantized data of a pixel of interest is diffused to pixels around the pixel of interest. In quantization, the pixel data determined to be printed by the printing element which cannot print normally undergoes quantization processing different from that for other pixel data. Accordingly, a high-quality image can be printed even in printing using a printhead with a printing element which cannot print normally.
    Type: Grant
    Filed: September 24, 2002
    Date of Patent: November 25, 2003
    Assignee: Canon Kabushiki Kaisha
    Inventor: Shohei Tsutsumi
  • Publication number: 20030058303
    Abstract: In a printing apparatus which performs printing by moving a printhead having a plurality of printing elements arrayed in a predetermined direction, relatively to a printing medium, whether input pixel data is pixel data to be printed by a printing element which cannot print normally is determined. Input multilevel data of each pixel is converted into data of a smaller number of gray levels than the number of input gray levels. The difference between input data and quantized data of a pixel of interest is diffused to pixels around the pixel of interest. In quantization, the pixel data determined to be printed by the printing element which cannot print normally undergoes quantization processing different from that for other pixel data. Accordingly, a high-quality image can be printed even in printing using a printhead with a printing element which cannot print normally.
    Type: Application
    Filed: September 24, 2002
    Publication date: March 27, 2003
    Applicant: Canon Kabushiki Kaisha
    Inventor: Shohei Tsutsumi