Optimization methods for the insertion, protection, and detection of digital watermarks in digital data
View Patent ↗Disclosed herein are methods and systems for encoding digital watermarks into content signals. Also disclosed are systems and methods for detecting and/or verifying digital watermarks in content signals. According to one embodiment, a system for encoding of digital watermark information includes: a window identifier for identifying a sample window in the signal; an interval calculator for determining a quantization interval of the sample window; and a sampler for normalizing the sample window to provide normalized samples. According to another embodiment, a system for pre-analyzing a digital signal for encoding at least one digital watermark using a digital filter is disclosed. According to another embodiment, a method for pre-analyzing a digital signal for encoding digital watermarks comprises: (1) providing a digital signal; (2) providing a digital filter to be applied to the digital signal; and (3) identifying an area of the digital signal that will be affected by the digital filter based on at least one measurable difference between the digital signal and a counterpart of the digital signal selected from the group consisting of the digital signal as transmitted, the digital signal as stored in a medium, and the digital signal as played backed. According to another embodiment, a method for encoding a watermark in a content signal includes the steps of (1) splitting a watermark bit stream; and (2) encoding at least half of the watermark bit stream in the content signal using inverted instances of the watermark bit stream. Other methods and systems for encoding/decoding digital watermarks are also disclosed.
1. A system for digital watermark encode/decode operations, comprising:
a CODEC database comprising a plurality of CODECs; and
a processor which encodes at least one watermark using at least one CODEC from the CODEC database.
2. The system of claim 1 wherein the processor encodes a plurality of watermarks using at least two CODECs from the CODEC database, and wherein the processor stores each of the CODECs to the watermarking key.
3. The system of claim 1 wherein the processor generates a hash value for information regarding the CODEC used to encode the plurality of watermarks and attaches the hash value to the watermark.
4. A method for digital watermark encode/decode comprising;
providing a digital signal stream;
using one or more of a plurality of watermarking CODECs to encode at least one digital watermark; and
associating the one or more of a plurality of watermarking CODECs with a predetermined key.
5. The digital watermark system of claim 1 , wherein one of the plurality of codecs includes at least one function common to at least one other codec.
6. The digital watermark system of claim 1 , wherein the plurality of codecs are predefined based on at least one criterion selected from the group comprising: robustness, security, imperceptibility, signal characteristics, encoding, decoding, and combinations thereof.
7. The digital watermark system of claim 1 , wherein the plurality of codecs consists of at least one algorithm common to the plurality of codecs.
8. The digital watermark system of claim 1 , wherein at least one of the plurality of codecs is associated with a key.
9. The method of claim 4 , further comprising using the predetermined key to detect or decode the at least one digital watermark.
10. A method of digital watermark encoding, comprising:
selecting one of a plurality of codecs; and
encoding at least one watermark using the selected codec.
11. The digital watermark encoding method of claim 10 , wherein the selected codec utilizes at least one comprising: predetermined keys, codec modules, framework architectures, functions, algorithms, and combinations thereof.
12. The digital watermark encoding method of claim 10 , further comprising detecting the at least one watermark.
13. The digital watermark encoding method of claim 10 , wherein the plurality of codecs is selected based on a predefined criterion comprising one of the group consisting of: robustness, imperceptibility, security, said codec's association with detection or decoding of at least one watermark, upgradability, variance of encode or decode functions, and combinations thereof.
14. A method of digital watermark decoding, comprising:
selecting one of a plurality of codecs; and
decoding at least one watermark using the selected codec.
15. The digital watermark decoding method of claim 14 , further comprising receiving at least one of the group comprising: at least one predetermined key, a codec module, a framework architectures, a function, an algorithm, and combinations thereof.
16. The digital watermark decoding method of claim 14 , further comprising detecting the at least one watermark.
17. The digital watermark decoding method of claim 14 , wherein the plurality of codecs is selected based on a predefined criterion comprising one of the group consisting of: robustness, imperceptibility, security, said codec's association with the encoding of at least one watermark, upgradability, variance of encode or decode functions, and combinations thereof.
18. A system for digital watermark operations comprising;
a selector for selecting a digital signal stream;
an encoder for encoding at least one digital watermark using one of a plurality of watermark codecs; and
a decoder for decoding the at least one digital watermark using one of the plurality of watermark codecs.
19. A system for digital watermark operations of claim 18 , wherein the encoder and the decoder comprise separate software programs.
20. A system for digital watermark operations of claim 18 , wherein the encoder and the decoder comprise separate hardware devices.
21. A system for digital watermark operations of claim 18 , wherein the encoder and the decoder operate independently.
22. A system for digital watermark operations of claim 18 , wherein the encoder and the decoder operate at separate locations.
23. A system for digital watermark operations of claim 18 , wherein the encoder or the decoder receive at least one key.
24. A system for digital watermark operations of claim 18 , wherein the encoder and the decoder have a modular architecture.
25. A system for digital watermark operations of claim 18 , wherein the encoder and the decoder are configured to operate on a plurality of watermarks.