07289643 is referenced by 271 patents and cites 274 patents.

The present invention relates to deriving and utilizing content signatures. A content signature is a representation of a content item, which is derived from the content item itself. According to the invention, a method of generating a content signature for a signal is provided. The method includes the steps of: i) dividing the signal into at least one set; ii) transforming the set into a frequency-based domain; iii) determining features of the transformed set; and iv) grouping the features so as to form a content signature of the set.

Title
Method, apparatus and programs for generating and utilizing content signatures
Application Number
10/27783
Publication Number
7289643 (B2)
Application Date
December 19, 2001
Publication Date
October 30, 2007
Inventor
Kenneth L Levy
Stevenson
WA, US
Hugh L Brunk
Portland
OR, US
Assignee
Digimarc Corporation
OR, US
IPC
G06K 9/00
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