Method and algorithm for accurate finger motion tracking
First Claim
1. A method for determining the motion or position of an object moving proximate a sensing array composed of multiple detectable electrical signal detection elements separated by a respective gap between the detectable electrical signal detection elements, the method comprising:
- monitoring a first detectable electrical signal sensed by a first respective detection element and detecting when a noise level of the first detectable electrical signal is less than a first preset noise threshold for a first preset period of time;
setting a commencement time when the first detectable electrical signal is below the first preset noise threshold for the first preset period of time;
continuing to monitor the first detectable electrical signal sensed by the first respective detection element and detecting when the noise level of the first detectable electrical signal exceeds a second preset noise threshold for a second preset period of time;
monitoring a second detectable electrical signal sensed by a second respective detection element and detecting when a noise level of the second detectable electrical signal is less than a third preset noise threshold for a third preset period of time;
setting a termination time when the second detectable electrical signal is below the third preset noise threshold for the third preset period of time;
calculating a designated stable time from the commencement time to the termination time; and
utilizing the designated stable time to determine either the motion or position of the object.
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Accused Products
Abstract
Enhanced accuracy finger position and motion sensors devices, algorithms, and methods are disclosed that can be used in a variety of different applications. The sensors can be used in conjunction with partial fingerprint imagers to produce improved fingerprint scanners. The finger motion sensors may also be used (either with or without a partial fingerprint imager) to produce highly accurate fingerprint images as well as to control electronic devices. Here improved signal analysis algorithms and methods are disclosed that enable finger position to be determined with higher levels of accuracy as the finger is swiped over finger position sensing arrays. These algorithms are particularly useful for deep finger penetrating radio frequency (RF) based sensing arrays.
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Citations
20 Claims
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1. A method for determining the motion or position of an object moving proximate a sensing array composed of multiple detectable electrical signal detection elements separated by a respective gap between the detectable electrical signal detection elements, the method comprising:
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monitoring a first detectable electrical signal sensed by a first respective detection element and detecting when a noise level of the first detectable electrical signal is less than a first preset noise threshold for a first preset period of time; setting a commencement time when the first detectable electrical signal is below the first preset noise threshold for the first preset period of time; continuing to monitor the first detectable electrical signal sensed by the first respective detection element and detecting when the noise level of the first detectable electrical signal exceeds a second preset noise threshold for a second preset period of time; monitoring a second detectable electrical signal sensed by a second respective detection element and detecting when a noise level of the second detectable electrical signal is less than a third preset noise threshold for a third preset period of time; setting a termination time when the second detectable electrical signal is below the third preset noise threshold for the third preset period of time; calculating a designated stable time from the commencement time to the termination time; and utilizing the designated stable time to determine either the motion or position of the object. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A method for determining the motion or position of a finger moving proximate a detectable electrical signal sensing array composed of multiple detection elements each separated by a respective gap between respective elements, the method comprising:
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monitoring a first detectable electrical signal sensed by a first respective detection element and detecting when a noise level of the first detectable electrical signal is less than a first preset noise threshold for a first preset period of time; setting a commencement time when the first detectable electrical signal is below the first preset noise threshold for the first preset period of time; continuing to monitor the first detectable electrical signal sensed by the first respective detection element and detecting when the noise level of the first detectable electrical signal exceeds a second preset noise threshold for a second preset period of time; monitoring a second detectable electrical signal sensed by a second respective detection element and detecting when a noise level of the second detectable electrical signal is less than a third preset noise threshold for a third preset period of time; setting a termination time when the second detectable electrical signal is below the third preset noise threshold for the third preset period of time; calculating a designated stable time from the commencement time to the termination time; and utilizing the designated stable time to determine either the motion or position of the finger. - View Dependent Claims (10, 11, 12, 13, 14, 15, 16, 17, 18, 19)
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20. A tangible machine readable medium storing instructions that, when executed by a computing device, cause the computing device to perform a method for determining the motion or position of an object moving proximate a sensing array composed of multiple detectable electrical signal detection elements separated by a respective gap between the detectable electrical signal detection elements, comprising:
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monitoring a first detectable electrical signal sensed by a first respective detection element and detecting when a noise level of the first detectable electrical signal is less than a first preset noise threshold for a first preset period of time; setting a commencement time when the first detectable electrical signal is below the first preset noise threshold for the first preset period of time; continuing to monitor first the detectable electrical signal sensed by the first respective detection element and detecting when the noise level of the first detectable electrical signal exceeds a second preset noise threshold for a second preset period of time; monitoring a second detectable electrical signal sensed by a second respective detection element and detecting when a noise level of the second detectable electrical signal is less than a third preset noise threshold for a third preset period of time; setting a termination time when the second detectable electrical signal is below the third preset noise threshold for the third preset period of time; calculating a designated stable time from the commencement time to the termination time; and utilizing the designated stable time to determine either the motion or position of the object.
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Specification