Patents by Inventor Tsutomu Fujishima

Tsutomu Fujishima 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).

  • Letter-box screen detection apparatus
    Patent number: 5973749
    Abstract: The DC level of the low-frequency component of a horizontal frequency is detected from a video signal by a horizontal low pass filter (LPF) 16d and a DC value detection circuit. In addition, the high-frequency component of the horizontal frequency is detected from the video signal by a horizontal band pass filter (BPF) and a nonlinear circuit. Furthermore, a high-frequency component in the vertical direction is detected from the video signal by a vertical BPF 16i and a nonlinear circuit 16i. On the basis of three detection results, the presence/absence of a non-image portion of the video signal is determined by a determination circuit.
    Type: Grant
    Filed: October 7, 1997
    Date of Patent: October 26, 1999
    Assignee: Kabushiki Kaisha Toshiba
    Inventors: Satoyuki Ishii, Tsutomu Fujishima
  • Letter-box screen detection apparatus
    Patent number: 5719636
    Abstract: The DC level of the low-frequency component of a horizontal frequency is detected from a video signal by a horizontal LPF 16d and a DC value detection circuit 16g. In addition, the high-frequency component of the horizontal frequency is detected from the video signal by a horizontal BPF 16e and a nonlinear circuit 16h. Furthermore, a high-frequency component in the vertical direction is detected from the video signal by a vertical BPF 16f and a nonlinear circuit 16i. On the basis of three detection results, the presence/absence of a non-image portion of the video signal is determined by a determination circuit 16j.
    Type: Grant
    Filed: December 28, 1995
    Date of Patent: February 17, 1998
    Assignee: Kabushiki Kaisha Toshiba
    Inventors: Satoyuki Ishii, Tsutomu Fujishima, Shigeki Kamimura