Patents by Inventor James R. Metcalf

James R. Metcalf 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).

  • Graphics engine for true colour 2D graphics
    Patent number: 5459823
    Abstract: A graphics engine is disclosed which can be used in a colour desktop publishing system. The graphics engine accepts 32-bit RGBM data and performs pixel level calculations under computer control to output processed 32-bit RGBM data. The engine comprises a render processor interface, a run controller including a ramp generator, and a control unit. Interpolators are provided for each colour (RGB) and cascaded with corresponding compositors. A transparency interpolator and matte combiner alter the matte plane of the video image. The engine can output data suitable for rendering by a colour laser printer for a full size A3 page at 400 dots per inch.
    Type: Grant
    Filed: July 3, 1991
    Date of Patent: October 17, 1995
    Assignees: Canon Kabushiki Kaisha, Canon Information Systems Research Australia Pty. Ltd.
    Inventors: Kia Silverbrook, James R. Metcalf