Methods for inserting and detecting watermarks in digital data

• US 20060251291A1
• Filed: 07/19/2006
• Published: 11/09/2006
• Est. Priority Date: 11/18/1993
• Status: Active Grant

• Current Assignee: Digimarc Corporation
• Original Assignee: Digimarc Corporation
• Inventors: Rhoads, Geoffrey B.
• Granted Patent: US 7,992,003 B2
• Time in Patent Office: Days
• US Class Current: 382/100
• CPC Class Codes: B42D 25/00 Information-bearing cards or sheet-like structures characterised by identification or security features; Manufacture thereof printing processes to produce identification or security features B41M3/14
• CPC Class Codes: G06F 16/955 using information identifiers, e.g. uniform resource locators [URL]
• CPC Class Codes: G06K 19/06037 multi-dimensional coding
• CPC Class Codes: G06K 19/06046 Constructional details
• CPC Class Codes: G06K 19/14 the marking being sensed by radiation
• CPC Class Codes: G06K 19/18 Constructional details
• CPC Class Codes: G06K 2019/06253 for a specific application
• CPC Class Codes: G06K 7/1417 2D bar codes
• CPC Class Codes: G06K 7/1447 extracting optical codes from image or text carrying said optical code
• CPC Class Codes: G06Q 20/1235 with control of digital rights management [DRM]
• CPC Class Codes: G06Q 20/341 Active cards, i.e. cards including their own processing means, e.g. including an IC or chip
• CPC Class Codes: G06Q 20/40145 Biometric identity checks
• CPC Class Codes: G06T 1/0021 Image watermarking
• CPC Class Codes: G06T 1/005 Robust watermarking, e.g. average attack or collusion attack resistant
• CPC Class Codes: G06T 1/0064 Geometric transfor invariant watermarking, e.g. affine transform invariant
• CPC Class Codes: G06T 2201/0052 Embedding of the watermark in the frequency domain
• CPC Class Codes: G06V 30/40 Document-oriented image-based pattern recognition
• CPC Class Codes: G07C 9/253 visually
• CPC Class Codes: G07D 7/0032 using holograms
• CPC Class Codes: G07D 7/0034 using watermarks
• CPC Class Codes: G07D 7/004 : using digital security elements, e.g. information coded on a magnetic thread or strip
• CPC Class Codes: G07F 17/0014 : for vending, access and use of specific services not covered anywhere else in G07F17/00 meter-controlled dispensing of liquid, gas or electricity G07F15/00
• CPC Class Codes: G07F 17/16 : for devices exhibiting advertisements, announcements, pictures or the like
• CPC Class Codes: G07F 17/26 : for printing, stamping, franking, typing or teleprinting apparatus ticket printing or the like apparatus G07F17/42
• 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 7/1008 : Active credit-cards provided with means to personalise their use, e.g. with PIN-introduction/comparison system
• CPC Class Codes: G07F 7/1016 : Devices or methods for securing the PIN and other transaction-data, e.g. by encryption arrangements for secret communication, see H04L9/00
• 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: G11B 20/00094 : involving measures which result in a restriction to authorised record carriers
• CPC Class Codes: G11B 20/00115 : wherein the record carrier stores a unique medium identifier
• CPC Class Codes: G11B 20/00166 : involving measures which result in a restriction to authorised contents recorded on or reproduced from a record carrier, e.g. music or software
• CPC Class Codes: G11B 20/00181 : using a content identifier, e.g. an international standard recording code [ISRC] or a digital object identifier [DOI]
• CPC Class Codes: G11B 20/0021 : involving encryption or decryption of contents recorded on or reproduced from a record carrier
• CPC Class Codes: G11B 20/00231 : wherein the key is obtained from a local external medium, e.g. a card
• CPC Class Codes: G11B 20/0071 : involving a purchase action
• CPC Class Codes: G11B 20/00884 : involving a watermark, i.e. a barely perceptible transformation of the original data which can nevertheless be recognised by an algorithm
• CPC Class Codes: G11B 20/00891 : embedded in audio data
• CPC Class Codes: H04B 1/665 : using psychoacoustic properties of the ear, e.g. masking effect
• CPC Class Codes: H04L 2463/103 : applying security measure for protecting copy right protecting software against unauthorised usage in a vending or licensing environment, e.g. protection the software providers copyright G06F21/10; data processing systems or methods, specially adapted for payment schemes, architectures or protocols G06Q20/00; secrecy systems or subscription systems H04N7/16
• 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 1/00079 : remotely
• CPC Class Codes: H04N 1/32122 : in a separate device, e.g. in a memory or on a display separate from image data
• 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 1/3216 : using Fourier transforms
• CPC Class Codes: H04N 1/32203 : Spatial or amplitude domain methods H04N1/32309 takes precedence
• CPC Class Codes: H04N 1/32208 : involving changing the magnitude of selected pixels, e.g. overlay of information or super-imposition H04N1/32219, H04N1/32224 take precedence
• CPC Class Codes: H04N 1/32251 : in multilevel data, e.g. greyscale or continuous tone data
• CPC Class Codes: H04N 1/32288 : Multiple embedding, e.g. cocktail embedding, or redundant embedding, e.g. repeating the additional information at a plurality of locations in the image
• 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
• CPC Class Codes: H04N 2005/91321 : the copy protection signal being a copy protection control signal, e.g. a record inhibit signal
• CPC Class Codes: H04N 2005/91335 : the copy protection signal being a watermark
• 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 21/8358 : involving watermark protecting executable software by watermarking G06F21/16; image watermarking in general G06T1/0021; watermarks inserted in still images for transmission purposes H04N1/32144; inserting watermarks during video coding H04N19/467
• CPC Class Codes: H04N 2201/3205 : of identification information, e.g. name or ID code H04N2201/3209 takes precedence
• CPC Class Codes: H04N 2201/3207 : of an address
• CPC Class Codes: H04N 2201/3225 : of data relating to an image, a page or a document
• CPC Class Codes: H04N 2201/3226 : of identification information or the like, e.g. ID code, index, title, part of an image, reduced-size image
• CPC Class Codes: H04N 2201/3233 : of authentication information, e.g. digital signature, watermark
• CPC Class Codes: H04N 2201/327 : which are undetectable to the naked eye, e.g. embedded codes
• CPC Class Codes: H04N 2201/3271 : Printing or stamping
• CPC Class Codes: H04N 2201/3274 : Storage or retrieval of prestored additional information
• CPC Class Codes: H04N 2201/328 : Processing of the additional information
• CPC Class Codes: H04N 5/913 : for scrambling ; for copy protection
• CPC Class Codes: H04W 24/00 : Supervisory, monitoring or testing arrangements

Abstract

The present invention relates generally to watermarking. In one implementation a method of pre-analyzing a digital signal for encoding digital watermarks using a digital filter comprising determining what changes in the digital signal will be affected by the digital filter is provided. In another implementation a system for pre-analyzing a digital signal for encoding at least one digital watermark using a digital filter is provided. The method includes a processor for identifying an area of the digital signal that will be affected by the digital filter; and an encoder for encoding the at least one digital watermark in the digital signal, the encoder encoding the at least one digital watermark so as to avoid the at least one area of the digital signal that will be affected by the digital filter. Other implementations are provided as well.

Claims

1. A method of pre-analyzing a digital signal for encoding digital watermarks using a digital filter comprising determining what changes in the digital signal will be affected by the digital filter.

2. The method according to claim 1, further comprising a step of encoding watermarks so as to ensure that the watermark will survive the changes introduced by the digital filter.

3. A system for pre-analyzing a digital signal for encoding at least one digital watermark using a digital filter comprising:

a processor for identifying an area of the digital signal that will be affected by the digital filter; and

an encoder for encoding the at least one digital watermark in the digital signal, the encoder encoding the at least one digital watermark so as to avoid the at least one area of the digital signal that will be affected by the digital filter.

4. The system of claim 3 wherein the system also uses at least one pseudo-random key, and wherein the area of the digital signal will also be affected a pseudo-random key for mapping the at least one digital watermark, and wherein the encoder is for encoding the at least one digital watermark in the digital signal according to a map of the at least one pseudo-random key.

5. The system of claim 4 wherein the processor operates on the digital signal by selecting an area of the digital signal from the group consisting of a frequency delimited area and a time delimited area.

6. The system of claim 4 wherein the processor operates on the digital signal by selecting an area of the digital signal from a bit-depth delimited area.

7. The system of claim 4 wherein the encoder ensures that the watermark will survive the changes introduced by the digital filter.

8. The system of claim 3 wherein the system also uses at least one pseudo-random key, and wherein the area of the digital signal will also be affected a pseudo-random key associated with the at least one digital watermark, and wherein the encoder is for encoding the at least one digital watermark in the digital signal according to embedding locations corresponding with the at least one pseudo-random key.

9. A method for pre-analyzing a digital signal for encoding a plurality of digital watermarks using a digital filter comprising:

providing a digital signal;

providing a plurality of digital watermarks;

determining an encoding level; and

encoding each of the plurality of digital watermarks in the digital signal at substantially the same encoding level.

10. The method of claim 9 further comprising:

providing at least one pseudo-random key for mapping digital watermarks, and wherein

said encoding each of the plurality of digital watermarks in the digital signal at substantially the same encoding level is based on the map of the at least one pseudo-random key.

11. The method of claim 9 further comprising:

providing at least one pseudo-random key corresponding to embedding locations for digital watermarks, and wherein

said encoding each of the plurality of digital watermarks in the digital signal at substantially the same encoding level is based on the at least one pseudo-random key.

12. A method for pre-analyzing a digital signal for encoding digital watermarks using a digital filter comprising:

identifying at least one of a frequency and a time delimited area of the digital signal that will be affected by the digital filter; and

encoding at least one digital watermark so as to avoid the identified area.

13. The method of claim 12 further comprising:

providing at least one pseudo-random key corresponding to embedding locations for digital watermarks, and wherein

said encoding at least one digital watermark so as to avoid the identified area and is determined by said at least one pseudo-random key.

14. The method of claim 12 further comprising:

providing at least one pseudo-random key for mapping digital watermarks, wherein

said encoding at least one digital watermark so as to avoid the identified area and is determined by said at least one pseudo-random key.

15. A method for pre-analyzing a digital signal for encoding digital watermarks using a digital filter comprising:

identifying at least one change to the digital signal that will be affected by the digital filter; and

encoding at least one digital watermark so the watermark survives the changes introduced by the digital filter.

16. The method of claim 15 further comprising:

providing at least one pseudo-random key for inserting digital watermarks, wherein said

encoding at least one digital watermark so the watermark survives the changes introduced by the digital filter is based on the at least one identified change to the digital signal and the insertion location determined by said at least one pseudo-random key.

17. The method of claim 15 further comprising:

providing at least one pseudo-random key for inserting digital watermarks, wherein said

encoding at least one digital watermark so the watermark survives the changes introduced by the digital filter is based on the at least one identified change to the digital signal and the insertion location corresponding to said at least one pseudo-random key.

18. A system for encoding a watermark in a digital signal, comprising:

a generator for generating a plurality of watermark pseudo-random key bits; and

an encoder for encoding the watermark in the digital signal using the watermark pseudo-random key bits and characteristics of the digital signal.

19. The system of claim 18, wherein the generator is selected from the group consisting of a non-linear generator and a scrambling generator.

20. The system of claim 18, wherein the characteristics of the digital signal comprise mathematically defined functions of the digital signal.