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A wireless phone is equipped with a 2D optical sensor, enabling a variety of applications. For example, such a phone may also be provided with a digital watermark decoder, permitting decoding of steganographic data on imaged objects. Movement of a phone may be inferred by sensing movement of an imag

A wireless phone is equipped with a 2D optical sensor, enabling a variety of applications. For example, such a phone may also be provided with a digital watermark decoder, permitting decoding of steganographic data on imaged objects. Movement of a phone may be inferred by sensing movement of an imaged pattern across the optical sensor's field of view, allowing use of the phone as a gestural input device through which a user can signal instructions to a computer-based process. A variety of other arrangements by which electronic devices can interact with the physical world are also detailed, e.g., involving sensing and responding to digital watermarks, bar codes, RFIDs, etc. Other novel arrangements are also detailed.

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We claim: 1. A method comprising: presenting an object to an imaging system, the object having formed thereon a machine-readable pattern that encodes a plural symbol payload; processing image data produced by said imaging system to determine an orientation of the object as viewed by the imaging sys

We claim: 1. A method comprising: presenting an object to an imaging system, the object having formed thereon a machine-readable pattern that encodes a plural symbol payload; processing image data produced by said imaging system to determine an orientation of the object as viewed by the imaging system; triggering a first response of a first type if the object is determined to have a first orientation; and triggering a second response of a second, different, type if the object is determined to have a second orientation. 2. The method of claim 1 that further includes decoding information from at least part of said plural symbol payload, wherein the first and second responses also depend on said decoded information. 3. The method of claim 1 that includes determining an orientation of said pattern to thereby determine the orientation of the object. 4. The method of claim 1 that includes determining said orientation by reference to a subliminal graticule signal encoded in said pattern. 5. A method comprising: presenting an object to an imaging system, the object having formed thereon a machine-readable pattern that encodes a plural symbol payload; processing image data produced by said imaging system to determine an orientation of the object as viewed by the imaging system; and triggering a response to said object that depends, at least in part, on said orientation; wherein the imaging system comprises a cameraphone. 6. A handheld wireless telephone device including a 2D optical sensor and processing circuitry, the processing circuitry operative to analyze data from the 2D optical sensor to determine information relating to an orientation of a subject imaged thereby. 7. The wireless telephone of claim 6, wherein said processing circuitry is operative to cause the telephone to wirelessly transmit data that depends, at least in part, on said determined information. 8. The device of claim 6, wherein said processing circuitry is operative to analyze data from the 2D optical sensor to determine information relating to an orientation of a machine-readable pattern imaged thereby. 9. The device of claim 6, wherein said processing circuitry is operative to analyze data from the 2D optical sensor to determine information relating to a scale state. 10. The device of claim 6, wherein said processing circuitry is operative to analyze data from the 2D optical sensor to determine information related to a differential scale state. 11. The device of claim 6, wherein said processing circuitry is operative to analyze data from the 2D optical sensor to determine information relating to a rotation state. 12. The device of claim 6, wherein said processing circuitry is operative to control a device action based, at least in part, on said determined information. 13. The device of claim 6, wherein said processing circuitry is operative to decode digital data from said imaged subject and control a device action based, at least in part, on said decoded digital data. 14. A handheld device including a 2D optical sensor and processing circuitry, the processing circuitry operative to analyze data from the 2D optical sensor to determine information relating to an orientation of a subject imaged thereby, wherein said processing circuitry is operative to analyze data from the 2D optical sensor, captured over time, to determine a change in said information relating to orientation. 15. A handheld device including a 2D optical sensor and processing circuitry, the processing circuitry operative to analyze data from the 2D optical sensor to determine information relating to an orientation of a subject imaged thereby, wherein said processing circuitry is operative to analyze data from the 2D optical sensor, captured over time, to determine information relating to a change in scale state. 16. A handheld device including a 2D optical sensor and processing circuitry, the processing circuitry operative to analyze data from the 2D optical sensor to determine information relating to an orientation of a subject imaged thereby, wherein said processing circuitry is operative to analyze data from the 2D optical sensor, captured over time, to determine a change in said information related to a differential scale state. 17. A handheld device including a 2D optical sensor and processing circuitry, the processing circuitry operative to analyze data from the 2D optical sensor to determine information relating to an orientation of a subject imaged thereby, wherein said processing circuitry is operative to analyze data from the 2D optical sensor, captured over time, to determine information relating to a change in rotation state. 18. The device of claim 17, wherein said processing circuitry is operative to control a device action based, at least in part, on said determined information.