Information embedding method, information extracting method, information embedding apparatus, information extracting apparatus, and recording media

• US 6,334,187 B1
• Filed: 06/30/1998
• Issued: 12/25/2001
• Est. Priority Date: 07/03/1997
• Status: Expired due to Term

• Current Assignee: Sovereign Peak Ventures, LLC (Dominion Harbor Enterprises, LLC)
• Original Assignee: Matsushita Electric Industrial Company Limited (Panasonic Holdings Corporation)
• Inventors: Kadono, Shinya
• Primary Examiner(s): Barron, Jr., Gilberto
• Application Number:
  US09/107,457
• Time in Patent Office: 1,274 Days
• Field of Search: 382/232, 380/200, 380/202, 380/205, 380/54, 380/269, 713/176
• US Class Current: 713/176
• CPC Class Codes: G06T 1/0035 Output size adaptive watermarking
• CPC Class Codes: G06T 1/0064 Geometric transfor invariant watermarking, e.g. affine transform invariant
• CPC Class Codes: G06T 9/20 Contour coding, e.g. using detection of edges
• CPC Class Codes: H04N 19/467 characterised by the embedded information being invisible, e.g. watermarking
• CPC Class Codes: H04N 2005/91335 the copy protection signal being a watermark
• CPC Class Codes: H04N 2005/9135 by superimposing the spectrally spread copy protection signal onto the video signal
• CPC Class Codes: H04N 21/23892 involving embedding information at multiplex stream level, e.g. embedding a watermark at packet level
• CPC Class Codes: H04N 5/913 for scrambling ; for copy protection

Abstract

An apparatus for embedding secret information in an image signal transmitted with a shape signal showing the shape of an object is described. This apparatus comprises an embedding position decision unit for deciding a position in the object where the secret information is to be embedded, according to the shape signal; and a compositor for embedding the secret information in the position decided by the decision unit. Therefore, the secret information is protected against translation or clipping of image.

Claims

1. A method for extracting secret information from an input signal in which said secret information is embedded by at least two kinds of methods, comprising the steps of:

extracting said secret information from said input signal by at least two kinds of methods; and

comparing at least two pieces of secret information so extracted with each other, and changing the processing for said secret information according to the result of the comparison.

2. An apparatus for extracting secret information from an input signal in which said secret information is embedded by a plurality of information embedding means for embedding said secret information by different methods, comprising:

a plurality of information extracting means for extracting, from said input signal, plural pieces of secret information which have been embedded by the respective methods; and

information decision means for comparing the contents of the plural pieces of secret information respectively extracted by said, plural information extracting means, and changing processing for said input signal according to the result of the comparison.