The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jan. 16, 2007
Filed:
Nov. 18, 1999
Takao Nakamura, Yokohama, JP;
Hiroshi Ogawa, Yokohama, JP;
Atsuki Tomioka, Yokohama, JP;
Youichi Takashima, Yokohama, JP;
Takao Nakamura, Yokohama, JP;
Hiroshi Ogawa, Yokohama, JP;
Atsuki Tomioka, Yokohama, JP;
Youichi Takashima, Yokohama, JP;
Nippon Telegraph and Telephone Corporation, Tokyo, JP;
Abstract
A method for embedding a watermark into a digital image. The method includes independently changing real number components and imaginary number components of each of coefficient values of a complex watermark coefficient matrix using a key, from the watermark to be embedded in the digital image. The method further includes a step for performing a discrete Fourier inverse transform on the sequence matrix of the changed watermark and generating a watermark pattern. The method also includes a step for adding like tiling the water mark pattern to the original image, and generating an embedded image.