Geographic-based watermarking keys
First Claim
1. A method comprising:
- determining a current geographic area;
selecting a first digital watermark detection key that is associated with the current geographic area, a selected first digital watermark detection key being selected from a plurality of digital watermark detection keys; and
controlling a digital watermark detector to employ the selected first digital watermark detection key to analyze a signal to obtain a digital watermark message there from, wherein the selected first digital watermark detection key corresponds to a particular digital watermark embedding key that is uniquely assigned to the geographic area.
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Abstract
The present invention relates generally to digital watermarking and steganography. In one implementation, a method includes determining a current geographic area of the cell phone; selecting a first digital watermark detector that is associated with the current geographic area, a selected first digital watermark detector being selected from a plurality of different digital watermark detectors; and controlling the cell phone to employ the selected first digital watermark detector to analyze a signal to obtain a digital watermark message there from, wherein the selected first digital watermark detector corresponds to a particular digital watermark embedder that is uniquely assigned to the geographic area.
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Citations
32 Claims
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1. A method comprising:
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determining a current geographic area; selecting a first digital watermark detection key that is associated with the current geographic area, a selected first digital watermark detection key being selected from a plurality of digital watermark detection keys; and controlling a digital watermark detector to employ the selected first digital watermark detection key to analyze a signal to obtain a digital watermark message there from, wherein the selected first digital watermark detection key corresponds to a particular digital watermark embedding key that is uniquely assigned to the geographic area. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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14. A method comprising:
in a cell phone; determining a current geographic area of the cell phone; selecting a first digital watermark detector that is associated with the current geographic area, a selected first digital watermark detector being selected from a plurality of different digital watermark detectors; and controlling the cell phone to employ the selected first digital watermark detector to analyze a signal to obtain a digital watermark message there from, wherein the selected first digital watermark detector corresponds to a particular digital watermark embedder that is uniquely assigned to the geographic area. - View Dependent Claims (15, 16, 17, 18)
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19. A cell phone comprising memory including instructions stored thereon, said instructions comprising instructions to carry out the method of claim 34.
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20. A method comprising:
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receiving information indicating a geographical area; with reference to at least a portion of the information indicating a geographical area, selecting a machine-readable indicia detector that corresponds to the information indicating a geographical area; processing machine-readable indicia with the selected machine-readable indicia detector to obtain a plural-bit message; and carrying out an action using the plural-bit message. - View Dependent Claims (11, 12, 13, 21, 22, 23, 24, 26)
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25. The method of claim 25 wherein the selected machine-readable indicia comprises at least a decryption key that corresponds to encryption used to encrypt the encrypted 2D-barcode.
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27. A method of comprising:
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receiving a signal from a cell phone; determining, based at least in part on the signal, whether the cell phone is physically located in a predetermined home area; and if not in the predetermined home area, communicating a machine-readable code detector to the cell phone for use as its primary machine-readable code detector to detect machine-readable code while outside of its predetermined home area. - View Dependent Claims (28, 29, 30, 31, 32)
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Specification