Benchmarks for Digital Watermarking

• US 20100042843A1
• Filed: 10/20/2009
• Published: 02/18/2010
• Est. Priority Date: 04/20/2001
• Status: Active Grant

• Current Assignee: Digimarc Corporation
• Original Assignee: Digimarc Corporation
• Inventors: Brunk, Hugh L., Hannigan, Brett T., Bradley, Brett A.
• Granted Patent: US 8,051,295 B2
• Time in Patent Office: Days
• US Class Current: 713/176
• CPC Class Codes: G06T 1/0042 Fragile watermarking, e.g. so as to detect tampering
• 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: H04L 67/06 specially adapted for file transfer, e.g. file transfer protocol [FTP]
• CPC Class Codes: H04L 69/329 in the application layer [OSI layer 7]
• CPC Class Codes: H04L 9/40 Network security protocols
• CPC Class Codes: H04N 1/32154 Transform domain methods H04N1/32309 takes precedence
• CPC Class Codes: H04N 1/3216 using Fourier transforms
• CPC Class Codes: H04N 17/004 for digital television systems
• CPC Class Codes: H04N 21/4425 Monitoring of client processing errors or hardware failure
• 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

Abstract

The presently claimed invention relates generally to digital watermarking of data, e.g., representing video or audio. One claim recites a method including: obtaining data representing video or audio; using a multi-purpose electronic processor programmed for: transforming the data into a transform domain, analyzing the transformed data to identify a plurality of transform coefficients according to predetermined criteria, and altering the identified plurality of transform coefficients to carry a digital watermark; and analyzing the data to determine a baseline state for the digital watermark. Of course, other combinations and claims are provided too.

Claims

1. A method comprising:

obtaining data representing video or audio;

using a multi-purpose electronic processor programmed for;

transforming the data into a transform domain, analyzing the transformed data to identify a plurality of transform coefficients according to predetermined criteria, and altering the identified plurality of transform coefficients to carry a digital watermark; and

analyzing the data to determine a baseline state for the digital watermark.

2. The method of claim 1 in which the digital watermark comprises a calibration signal.

3. A computer readable media comprising instructions stored thereon to cause a multi-purpose electronic processor to perform the acts of claim 1.

4. A computing device comprising instructions stored in memory, said instructions cause said computing device to perform the method of claim 1.

5. A method comprising:

obtaining data representing video or audio;

using a multi-purpose electronic processor programmed for;

compressing the data by transforming the data into a transform domain, analyzing the transformed data to identify a plurality of transform coefficients, and altering the identified plurality of transform coefficients to carry a digital watermark,

in which said digital watermark is provided so as to allow detection of signal compression.

6. The method of claim 5 in which the digital watermark comprises a calibration signal.

7. A computer readable media comprising instructions stored thereon to cause a multi-purpose electronic processor to perform the acts of claim 5.

8. A computing device comprising instructions stored in memory, said instructions cause said computing device to perform the method of claim 5.

9. An electronic processor programmed as a digital watermark embedder, in which said digital watermark embedder is configured to embed a benchmark in a media signal, the benchmark comprising a watermark signal characteristic, the benchmark to be included in the watermark signal embedded by said digital watermark embedder.

10. The electronic processor of claim 9 in which said digital watermark embedder is operating to include the benchmark in the watermark signal.