Patents by Inventor Natsuhiko Hirayama

Natsuhiko Hirayama 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 output device and test chart for the same
    Patent number: 7130076
    Abstract: In an image output device a test chart 18 including tests charts 6 of each color is used, and a tone correction table is calculated. The test charts 6 are patterned in a checkered pattern, each including continuous areas 10 in which the tones increase in steps and reference areas 11 for comparison with the continuous areas 10. The reference areas 11 are formed of white ground of paper in a highlight proof part 7, a solid pattern with a maximum density in a shadow proof part 8, and halftone dot-concentrated or line screens with a lower resolution than in the continuous areas in a middle proof part 9. Tone correction values are calculated from characteristic values of the highlight, shadow and middle parts, obtained from visual data of the test chart 18.
    Type: Grant
    Filed: July 25, 2001
    Date of Patent: October 31, 2006
    Assignee: Ricoh Printing Systems, Ltd.
    Inventors: Takeshi Shibuya, Yukio Yamamoto, Naoyuki Urata, Toshiyuki Yamada, Natsuhiko Hirayama
  • Image output device and test chart for the same
    Publication number: 20020030832
    Abstract: In an image output device a test chart 18 including tests charts 6 of each color is used, and a tone correction table is calculated. The test charts 6 are patterned in a checkered pattern, each including continuous areas 10 in which the tones increase in steps and reference areas 11 for comparison with the continuous areas 10. The reference areas 11 are formed of white ground of paper in a highlight proof part 7, a solid pattern with a maximum density in a shadow proof part 8, and halftone dot-concentrated or line screens with a lower resolution than in the continuous areas in a middle proof part 9. Tone correction values are calculated from characteristic values of the highlight, shadow and middle parts, obtained from visual data of the test chart 18.
    Type: Application
    Filed: July 25, 2001
    Publication date: March 14, 2002
    Inventors: Takeshi Shibuya, Yukio Yamamoto, Naoyuki Urata, Toshiyuki Yamada, Natsuhiko Hirayama