Patents by Inventor Yoshihiro Jimbo

Yoshihiro Jimbo 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).

  • Method and equipment for processing gray scale facsimile signal
    Patent number: 4409623
    Abstract: A gray scale facsimile signal is divided into a plurality of block signals, each composed of a plurality of picture element signals. For each block signal are obtained binary space information indicating whether the level of each picture element signal is higher or lower than a threshold value, mean gradation information of the picture element signals having the levels above the threshold value and mean gradation information of the picture element signals having levels below the threshold value. When the difference between the two pieces of mean gradation information representing the gradation of the block signal is smaller than a predetermined value and/or when the number of picture element signals of the levels either higher or lower the threshold value is smaller than a predetermined value, the block signal is represented by one of the two pieces of gradation information and the entire space information of the block signal is set to one value of the binary space information.
    Type: Grant
    Filed: January 25, 1982
    Date of Patent: October 11, 1983
    Assignee: Nippon Telegraph & Telephone Public Corporation
    Inventors: Makoto Kobayashi, Tetsuji Yamamoto, Yoshihiro Jimbo