초록 ▼

A digital watermark is added to audio or visual content. An illustrative embodiment permutes the content, alters the permuted content to encode a watermark, and inverse-permutes the content to return same to substantially its original form. Related watermark decoding methods are also detailed, as ar

A digital watermark is added to audio or visual content. An illustrative embodiment permutes the content, alters the permuted content to encode a watermark, and inverse-permutes the content to return same to substantially its original form. Related watermark decoding methods are also detailed, as are ancillary features and techniques.

대표청구항 ▼

1. A method of watermark processing, the method comprising: receiving content data representing audio, image, or video information;receiving watermark data to be hidden in the content data;permuting at least some of the content data;transforming the permuted content data into a different domain;alte

1. A method of watermark processing, the method comprising: receiving content data representing audio, image, or video information;receiving watermark data to be hidden in the content data;permuting at least some of the content data;transforming the permuted content data into a different domain;altering the transformed content data to represent the watermark data therein; andinverse-permuting the content data following the altering;wherein at least one of the foregoing acts is performed by a processor. 2. The method of claim 1, further comprising inverse-transforming the content data back to an original domain after the altering. 3. The method of claim 1, wherein the permuting performs a spectral whitening operation. 4. The method of claim 1, wherein the permuting comprises applying a pseudo-random function. 5. The method of claim 1, wherein the transforming comprises using a Walsh Hadamard transform. 6. A method of watermark processing, the method comprising: receiving content data representing audio, image or video information;permuting at least some of the content data;transforming the permuted content data into another domain;decoding watermark data from the transformed content data, wherein the watermark data is encoded in the content data by previous alterations to the content data; andinverse-permuting the content data following the decoding;wherein at least one of the foregoing acts is performed by a processor. 7. A non-transitory computer-readable medium having instructions stored thereon, the instructions comprising: instructions to receive content data representing audio, image, or video information;instructions to receive watermark data to be hidden in the content data;instructions to permute at least some of the content data;instructions to transform the permuted content data into another domain;instructions to alter the transformed content data to represent the watermark data therein; andinstructions to inverse-permute the content data following the altering. 8. The non-transitory computer-readable medium method of claim 7, further comprising instructions to inverse-transform the content data back to an original domain after the altering. 9. The non-transitory computer-readable medium method of claim 7, wherein the instructions to permute at least some of the content data performs a spectral whitening operation. 10. The non-transitory computer-readable medium method of claim 7, wherein the instructions to permute comprises instructions to apply a pseudo-random function. 11. The non-transitory computer-readable medium method of claim 7, wherein the instructions to transform comprises instructions to perform a Walsh Hadamard transform. 12. An apparatus comprising: an input configured to: receive content data representing audio, image, or video information; andreceive watermark data to be hidden in the content data; andan electronic processor configured to: permute at least some of the content data;transform the permuted content data into another domain;alter the transformed content data to represent the watermark data therein; andinverse-permute the content data following the altering. 13. The apparatus of claim 12, wherein the electronic processor is further configured to inverse-transform the content data back to an original domain after the altering. 14. The apparatus of claim 12, wherein the electronic processor is further configured to permute at least some of the content data by performing a spectral whitening operation. 15. The apparatus of claim 12, wherein the electronic processor is further configured to permute at least some of the content data by applying a pseudo-random function. 16. The apparatus of claim 12, wherein the electronic processor is further configured to transform at least some of the content data by performing a Walsh Hadamard transform. 17. A non-transitory computer-readable medium having instructions stored thereon, the instructions comprising: instructions to receive content data representing audio, image or video information;instructions to permute at least some of the content data; andinstructions to transform the permuted content data into another domain;instructions to decode watermark data from the transformed content data, wherein the watermark data is encoded in the content data by previous alterations to the content data; andinstructions to inverse-permute the content data following the decoding. 18. An apparatus comprising: an input configured to receive content data representing audio, image or video information; andan electronic processor configured to: permute at least some of the content data;transform the permuted content data into another domain;decode watermark data from the transformed content data, wherein the watermark data is encoded in the content data by previous alterations to the content data; andinverse-permute the content data following the decoding.