Electronic compass calibration based on visual code
First Claim
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1. A system comprising:
- a digital imaging device;
an electronic compass (e-compass); and
a processor coupled to the digital imaging device and the e-compass, wherein the processor executes instructions to;
cause the image device to scan a visual code;
read a yaw angle from the visual code;
cause the e-compass to obtain magnetic field measurements;
estimate a yaw angle based on the magnetic field measurements;
compare the yaw angle read from the visual code and the estimated yaw angle to determine a quality factor; and
determine whether the e-compass is calibrated based at least partially upon the quality factor.
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Abstract
In a disclosed embodiment, a system includes a digital imaging device, an electronic compass (e-compass), and a processor coupled to the digital imaging device and the e-compass. The processor is operable to execute instructions that cause the image device to scan a visual code, read a yaw angle from the visual code, cause the e-compass to obtain magnetic field measurements, estimate a yaw angle based on the magnetic field measurements, compare the yaw angle read from the visual code and the estimated yaw angle to determine a quality factor; and determine whether the e-compass is calibrated based at least partially upon the quality factor.
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Citations
20 Claims
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1. A system comprising:
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a digital imaging device; an electronic compass (e-compass); and a processor coupled to the digital imaging device and the e-compass, wherein the processor executes instructions to; cause the image device to scan a visual code; read a yaw angle from the visual code; cause the e-compass to obtain magnetic field measurements; estimate a yaw angle based on the magnetic field measurements; compare the yaw angle read from the visual code and the estimated yaw angle to determine a quality factor; and determine whether the e-compass is calibrated based at least partially upon the quality factor. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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15. A system comprising:
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an imaging device; an electronic compass (e-compass); and a processor coupled to the imaging device and the e-compass, wherein the processor causes the imaging device to scan a visual code, read a yaw angle from the visual code, and compute an estimate of a yaw angle based on magnetic field measurements taken using the e-compass and scale factors and biases determined from the magnetic field measurements, wherein the processor computes a quality factor based on the yaw angle read from the visual code and the estimated yaw angle. - View Dependent Claims (16, 17, 18)
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19. A system comprising:
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a digital imaging device; an electronic compass (e-compass); and a processor coupled to the digital imaging device and the e-compass, wherein the processor executes instructions to; cause the image device to scan a visual code at a location; read from the visual code a yaw angle and true magnetic field measurements correspond to the location; obtain magnetic field measurements using the e-compass; estimate a yaw angle based on the magnetic field measurements and the true magnetic field measurements read from the visual code; compare the yaw angle read from the visual code and the estimated yaw angle to determine a quality factor; and determine whether the e-compass is calibrated based at least partially upon the quality factor. - View Dependent Claims (20)
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Specification