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:
Apr. 08, 2008
Filed:
Jan. 15, 2004
Takayuki Sugahara, Yokosuka, JP;
Masayoshi Nishitani, Yokosuka, JP;
Kenjiro Ueda, Yokohama, JP;
Victor Company of Japan, Ltd., Kanagawa-Ken, JP;
Abstract
Digital image data is divided, per frame, into 'N' fields. 'N/m' combinations of imperceptible codes are produced, each combination having “m” codes given by an inverse of a function giving an identification code with the “m” codes as variables. “N” and “m” are an integer of 2 or more and “m” is given by dividing “N” by an integer. The combinations are embedded into the data to embed the “m” codes of each combination into the data in “m” fields according to a rule of positional correspondence to give correlation among “m” fields in “N” fields. The data is divided into “N” fields and the codes are extracted therefrom and combined into the combinations according to the rule. An operation is conducted based on the function. It is determined that the data has not been tampered with only when the operation gives the identification code for each combination.