Patents by Inventor Hirohide Endou

Hirohide Endou 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: 3973239
    Abstract: A pattern preliminary processing system wherein high and low frequency noise other than the pattern signal from a pick-up tube are eliminated by a filtering circuit thereby to "relieve" the pattern against the background and the thus obtained pattern signal is tri-valued into signals of high, medium and low levels by means of a processing circuit having two different threshold values, and then the signal of the medium level is converted into a signal of high or low level with reference to peripheral information thereby to finally bi-value the pattern signal.
    Type: Grant
    Filed: October 15, 1974
    Date of Patent: August 3, 1976
    Assignee: Hitachi, Ltd.
    Inventors: Shigeru Kakumoto, Toshihiro Hananoi, Hirohide Endou