Patents by Inventor Takafumi Ohkubo

Takafumi Ohkubo 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).

  • Gray scale level reduction method, apparatus and integrated circuit, and computer readable medium storing gray scale reduction program
    Patent number: 6133902
    Abstract: A gray scale reduction method or apparatus reduces required memory capacity for storing gray scale as compared with conventional gray scale reduction methods. The gray scale reduction apparatus performs quantization error scattering of input gray level data of an input image. Data produced by the quantization error scattering is filtered after completing the quantization error scattering.
    Type: Grant
    Filed: November 21, 1997
    Date of Patent: October 17, 2000
    Assignee: Mitsubishi Denki Kabushiki Kaisha
    Inventors: Takafumi Ohkubo, Makoto Matsumoto