Patents by Inventor Toshihiro Gai

Toshihiro Gai 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).

  • Brightness signal/color signal separation
    Patent number: 5392075
    Abstract: A brightness signal/color signal separating filter. Non-correlative energies are extracted in various combinations of the horizontal scanning direction, the vertical scanning direction, a brightness signal and a color signal so as to judge the degree of video correlation in the horizontal direction and in the vertical direction.
    Type: Grant
    Filed: April 28, 1994
    Date of Patent: February 21, 1995
    Assignee: Mitsubishi Denki Kabushiki Kaisha
    Inventor: Toshihiro Gai
  • Brightness signal/color signal separation filter including an image correction judging circuit
    Patent number: 5386244
    Abstract: A filter for separating brightness signal and color signal from a composite color signal of NTSC type or PAL type, includes a horizontal color signal extracting filter, a vertical color signal extracting filter, a horizontal/vertical color signal extracting filter, a switching circuit, and an image correlation judging circuit. The image correlation judging circuit makes the switching circuit select: the color signal extracted by the horizontal color signal extracting filter when the horizontal correlation is judged to be stronger than the sampling value at the target sampling point; the color signal extracted by the vertical color signal extracting filter when the vertical correlation is judged to be stronger than the same; and the color signal extracted by the horizontal/vertical color signal extracting filter when neither of them is judged to be stronger than the same.
    Type: Grant
    Filed: February 3, 1994
    Date of Patent: January 31, 1995
    Assignee: Mitsubishi Denki Kabushiki Kaisha
    Inventor: Toshihiro Gai
  • Brightness signal/color signal separation filter including an image correction judging circuit
    Patent number: 5198891
    Abstract: A filter for separating brightness signal and color signal from a composite color signal of NTSC type or PAL type, includes a horizontal color signal extracting filter, a vertical color signal extracting filter, a horizontal/vertical color signal extracting filter, a switching circuit, and an image correlation judging circuit. The image correlation judging circuit makes the switching circuit select: the color signal extracted by the horizontal color signal extracting filter when the horizontal correlation is judged to be stronger than the sampling value at the target sampling point; the color signal extracted by the vertical color signal extracting filter when the vertical correlation is judged to be stronger than the same; and the color signal extracted by the horizontal/vertical color signal extracting filter when neither of them is judged to be stronger than the same.
    Type: Grant
    Filed: January 21, 1992
    Date of Patent: March 30, 1993
    Assignee: Mitsubishi Denki Kabushiki Kaisha
    Inventor: Toshihiro Gai