Patents by Inventor Juńichi Taguchi

Juńichi Taguchi 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 of authenticating digital-watermark pictures
    Patent number: 6418232
    Abstract: An extraction process includes the steps of carrying out a geometric transformation on a picture being inspected to transform the size of the picture being inspected into a reduced scale of an original picture; creating a plurality of degraded original pictures with different types each obtained as a result of degradation of the original picture; creating a plurality of differential pictures by subtraction of the degraded original pictures with different types from the picture being inspected with a transformed size to cancel degradation components in the picture being inspected with a transformed size; and extracting the information corresponding to the authentication information.
    Type: Grant
    Filed: August 26, 1999
    Date of Patent: July 9, 2002
    Assignee: Hitachi, Ltd.
    Inventors: Kazunori Nakano, Juńichi Taguchi, Hiroshi Yoshiura, Isao Echizen, Yutaka Kurosu