Patents by Inventor Akira Hitotsumatsu

Akira Hitotsumatsu 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: 5796425
    Abstract: An imaging system that images a raster-scanned display receives the vertical synchronizing signal of the raster-scanned display, and has a synchronizing signal generator for generating the vertical synchronizing signal of the imaging system. According to a first aspect of the invention, the output of the imaging system is multiplied by a compensation signal that compensates for brightness differences due to a difference in frequency between the two vertical synchronizing signals. According to a second aspect of the invention, the vertical synchronizing signal of the imaging system is delayed from the vertical synchronizing signal of the raster-scanned display by an amount calculated so that no such brightness difference occurs in the part of the raster-scanned display viewed by the imaging system.
    Type: Grant
    Filed: May 9, 1996
    Date of Patent: August 18, 1998
    Assignee: Mitsubishi Denki Kabushiki Kaisha
    Inventors: Kouji Minami, Akira Hitotsumatsu
  • Patent number: 5793340
    Abstract: An adjustment reference point is defined as a point on a screen on which a corresponding adjustment point of an image is projected when the image projected by a CRT system video projector is assumed to have no raster distortion. An image correction apparatus of this invention produces a raster distortion correction data on the basis of a difference between the adjustment reference point and the corresponding adjustment point obtained from a video signal. The video signal is obtained by picking up an predetermined image including an adjustment reference point projected on the screen by using a camera device.
    Type: Grant
    Filed: September 15, 1995
    Date of Patent: August 11, 1998
    Assignee: Mitsubishi Denki Kabushiki Kaisha
    Inventors: Takehiko Morita, Akira Hitotsumatsu, Kouji Minami, Yoshiki Ono