Multimedia data embedding and decoding
A method for embedding data into a media signal receives a media signal, divides the media signal into blocks of samples, and calculates a function of the samples in the blocks, including transformations of samples in the blocks to corresponding block values. A processor uses the block value to determine a factor for samples in the blocks to be multiplied by the samples so that when a data embedding function is evaluated for the block, an output of the data embedding function corresponds to a data value representing desired digital data embedded in the block. A compatible decoder extracts this embedded data from the media signal. The decoder divides the media signal into blocks of samples and calculates a function of the samples in the blocks, including transformations of samples in the blocks to corresponding block values. A processor processes the block value to evaluate a data embedding function to determine digital data embedded in the block.
1. A method comprising:
receiving a media signal;
dividing the media signal into blocks of samples;
calculating a function of the samples in the blocks, including transformations of the samples in the blocks to corresponding block values; and
with a processor, automatically using the block values to determine a factor for the samples in the blocks to be multiplied by the samples so that when a data embedding function is evaluated for a block, an output of the data embedding function corresponds to a data value representing digital data embedded in the block.
2. The method of claim 1 , wherein the transformations comprise transformations of the samples according to a key.
3. The method of claim 2 , wherein the transformations comprise projections of the samples according to the key.
4. The method of claim 1 , wherein the blocks correspond to a quantization step, and wherein the embedding function includes a quantization of the function of the samples in the blocks.
5. The method of claim 1 , wherein the factor comprises a function of weighting values computed from samples in the block.
6. The method of claim 5 , wherein the factor comprises the function of the weighting values and a data vector.
7. A non-transitory computer readable medium having instructions stored thereon, the instructions comprising:
instructions to receive a media signal;
instructions to divide the media signal into blocks of samples;
instructions to calculate a function of the samples in the blocks, including transformations of the samples in the blocks to corresponding block values; and
instructions to use the block values to determine a factor for the samples in the blocks to be multiplied by the samples so that when a data embedding function is evaluated for a block, an output of the data embedding function corresponds to a data value representing digital data embedded in the block.
8. A method comprising:
receiving a media signal;
dividing the media signal into blocks of samples;
calculating a function of the samples in the blocks, including transformations of the samples in the blocks to corresponding block values; and
with a processor, automatically using the block values to evaluate a data embedding function to determine digital data embedded in a block, wherein the samples in the blocks have been multiplied by a factor so that an output of the data embedding function corresponds to a data value representing the digital data embedded in the block.
9. The method of claim 8 , wherein the transformations comprise transformations of the samples according to a key.
10. The method of claim 9 , wherein the transformations comprise projections of the samples according to the key.
11. The method of claim 8 , wherein the blocks correspond to a quantization step, and wherein the embedding function includes a quantization of the function of the samples in the blocks.
12. The method of claim 8 , wherein the factor comprises a function of weighting values computed from samples in the block.
13. The method of claim 12 , wherein the factor comprises the function of the weighting values and a data vector.
14. A non-transitory computer readable medium having instructions stored thereon, the instructions comprising:
instructions to receive a media signal;
instructions to divide the media signal into blocks of samples;
instructions to calculate a function of the samples in the blocks, including transformations of the samples in the blocks to corresponding block values; and
instructions to use the block values to evaluate a data embedding function to determine digital data embedded in a block, wherein the samples in the blocks have been multiplied by a factor so that an output of the data embedding function corresponds to a data value representing the digital data embedded in the block.
15. The non-transitory computer readable medium of claim 14 , wherein the factor comprises a function of weighting values computed from the samples in the block.
16. The non-transitory computer readable medium of claim 15 , wherein the factor comprises the function of the weighting values and a data vector.
17. A device comprising:
means for receiving a media signal;
means for dividing the media signal into blocks of samples;
means for calculating a function of the samples in the blocks, including transformations of the samples in the blocks to corresponding block values; and
means for automatically using the block values to determine a factor for the samples in the blocks to be multiplied by the samples so that when a data embedding function is evaluated for a block, an output of the data embedding function corresponds to a data value representing digital data embedded in the block.
18. The device of claim 17 , wherein the transformations comprise transformations of the samples according to a key.
19. The device of claim 18 , wherein the transformations comprise projections of the samples according to the key.
20. The device of claim 17 , wherein the blocks correspond to a quantization step, and wherein the embedding function includes a quantization of the function of the samples in the blocks.
21. The device of claim 17 , wherein the factor comprises a function of weighting values computed from samples in the block.
22. The device of claim 21 , wherein the factor comprises the function of the weighting values and a data vector.
23. A device comprising:
means for receiving a media signal;
means for dividing the media signal into blocks of samples;
means for calculating a function of the samples in the blocks, including transformations of the samples in the blocks to corresponding block values; and
means for using the block values to evaluate a data embedding function to determine digital data embedded in a block, wherein the samples in the blocks have been multiplied by a factor so that an output of the data embedding function corresponds to a data value representing the digital data embedded in the block.
24. The device of claim 23 , wherein the transformations comprise transformations of the samples according to a key.
25. The device of claim 24 , wherein the transformations comprise projections of the samples according to the key.
26. The device of claim 23 , wherein the blocks correspond to a quantization step, and wherein the embedding function includes a quantization of the function of the samples in the blocks.