Identification document including multiple watermarks

• US 20050058320A1
• Filed: 06/01/2004
• Published: 03/17/2005
• Est. Priority Date: 05/08/1995
• Status: Active Grant

• Current Assignee: Digimarc Corporation
• Original Assignee: Digimarc Corporation
• Inventors: Rhoads, Geoffrey B., Gustafson, Ammon E.
• Granted Patent: US 7,539,325 B2
• Time in Patent Office: Days
• US Class Current: 382/100
• CPC Class Codes: G06T 1/0071 using multiple or alternating watermarks
• CPC Class Codes: G06T 2201/0051 Embedding of the watermark in the spatial domain
• CPC Class Codes: G06T 2201/0052 Embedding of the watermark in the frequency domain
• CPC Class Codes: G06T 2201/0202 whereby the quality of watermarked images is measured; Measuring quality or performance of watermarking methods; Balancing between quality and robustness
• CPC Class Codes: G06T 2207/30144 Printing quality
• CPC Class Codes: G06T 7/0002 Inspection of images, e.g. flaw detection
• CPC Class Codes: G06T 7/0004 Industrial image inspection
• CPC Class Codes: G07C 9/253 visually
• CPC Class Codes: G07F 7/08 by coded identity card or credit card or other personal identification means without personal verification means G07F7/02
• CPC Class Codes: G07F 7/086 by passive credit-cards adapted therefor, e.g. constructive particularities to avoid counterfeiting, e.g. by inclusion of a physical or chemical security-layer for security documents G07D7/00; for the reading of record-carriers in general G06K7/00; for the design of coded credit-cards G06K19/10
• CPC Class Codes: G07F 7/12 Card verification
• CPC Class Codes: G10L 19/018 Audio watermarking, i.e. embedding inaudible data in the audio signal
• CPC Class Codes: G11B 20/00086 Circuits for prevention of unauthorised reproduction or copying, e.g. piracy indicating unauthorised use of record carriers in general G11B23/28; scrambling for television signal recording H04N5/913; network architectures or network protocols for network security H04L63/00; cryptographic mechanisms or cryptographic arrangements for secret or secure communication H04L9/00
• CPC Class Codes: H04N 1/00002 Diagnosis, testing or measuring; Detecting, analysing or monitoring not otherwise provided for error detection, error correction or monitoring in digital computers or digital computer components G06F11/00
• CPC Class Codes: H04N 1/00005 relating to image data
• CPC Class Codes: H04N 1/00037 Detecting, i.e. determining the occurrence of a predetermined state H04N1/00031 takes precedence
• CPC Class Codes: H04N 1/00092 relating to the original or to the reproducing medium, e.g. imperfections or dirt detecting properties of a sheet H04N1/00681
• CPC Class Codes: H04N 1/32144 embedded in the image data, i.e. enclosed or integrated in the image, e.g. watermark, super-imposed logo or stamp
• CPC Class Codes: H04N 1/32149 Methods relating to embedding, encoding, decoding, detection or retrieval operations
• CPC Class Codes: H04N 1/32304 Embedding different sets of additional information
• CPC Class Codes: H04N 1/32309 : in colour image data
• CPC Class Codes: H04N 1/32315 : Selecting a particular method from amongst a plurality of methods
• CPC Class Codes: H04N 1/32331 : Fragile embedding or watermarking
• CPC Class Codes: H04N 1/32352 : Controlling detectability or arrangements to facilitate detection or retrieval of the embedded information, e.g. using markers for decoding, detection or retrieval operations H04N1/32149 and subgroups take precedence

Abstract

Two or more digital watermarks are embedded in an identification document. In one implementation the digital watermarks include characteristics that are chosen so that the watermarks will be affected in different manners if the identification document is subsequently copied or reproduced. The detection process or mechanism reads two or more of the watermarks and compares their characteristics. In another implementation, the digital watermarks include characteristics that cooperate for authentication.

Claims

1. An identification document including a substrate with printing thereon, the printing comprising:

a first steganographic watermark, and

a second steganographic watermark, wherein

the first steganographic watermark corresponds with a first pattern, and the second steganographic watermark corresponds with a second pattern, and wherein

the first and second steganographic watermarks are affected in a different manner when the document is subjected to a first corruption process.

2. An identification document including a substrate and printing, wherein the identification document comprises:

a first digital watermark comprising a first plural-bit payload; and

a second digital watermark comprising a second different plural-bit payload,

wherein the first digital watermark and the second digital watermark are provided so as to cooperate for the authentication of the identification document.

3. The identification document of claim 2, wherein the first digital watermark and the second digital watermark cooperate by degrading differently when subjected to corruption.

4. The identification document of claim 2, wherein the first plural-bit payload and the second different plural-bit payload are provided for authentication of the identification document.