Dynamic finger detection mechanism for a fingerprint sensor
First Claim
1. An apparatus for determining a presence of a patterned biometric object, the apparatus comprising:
- a biometric sensor system configured to detect a presence of the patterned biometric object, to sense an image corresponding to the patterned biometric object and to translate the image into image data;
logic configured to be enabled based upon detecting the presence of the patterned biometric object, and to determine multiple values corresponding to multiple different statistical properties of the image data the logic comprising a plurality of statistical engines for the corresponding multiple values, and a plurality of comparators coupled to said plurality of statistical engines for generating output signals, the output signals indicating when the multiple values exceed a corresponding number of threshold levels; and
a signal generator configured to receive the output signals generate a wake up signal in the event a predetermined combination of the multiple values exceed a corresponding number of threshold levels.
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Abstract
The present invention discloses an apparatus for determining the presence of a patterned object on the surface of a sensor. The apparatus comprises a sensor system coupled to a means for generating a control signal. The sensor system is configured to sense an image corresponding to the patterned object and to translate the image into image data. The means for generating a control signal generates a control signal if statistics of the image data exceed a pre-determined number of threshold levels. In a preferred embodiment, the patterned object is finger with a fingerprint on its surface and the sensor is fingerprint swipe sensor. Preferably, the threshold levels are software programmable.
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Citations
36 Claims
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1. An apparatus for determining a presence of a patterned biometric object, the apparatus comprising:
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a biometric sensor system configured to detect a presence of the patterned biometric object, to sense an image corresponding to the patterned biometric object and to translate the image into image data; logic configured to be enabled based upon detecting the presence of the patterned biometric object, and to determine multiple values corresponding to multiple different statistical properties of the image data the logic comprising a plurality of statistical engines for the corresponding multiple values, and a plurality of comparators coupled to said plurality of statistical engines for generating output signals, the output signals indicating when the multiple values exceed a corresponding number of threshold levels; and a signal generator configured to receive the output signals generate a wake up signal in the event a predetermined combination of the multiple values exceed a corresponding number of threshold levels. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28)
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29. An apparatus comprising:
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a biometric sensor system configured to detect a presence of a biometric object, sense an image corresponding to the biometric object, and translate the image into image data; logic configured to be powered on based upon detecting the presence of the biometric object, and determine multiple values corresponding to multiple different statistical properties of the image data the logic comprising a plurality of statistical engines for the corresponding multiple values, and a plurality of comparators coupled to said plurality of statistical engines for generating output signals, the output signals indicating when the multiple values exceed a corresponding number of threshold levels; and a signal generator configured to receive the output signals generate a wake up signal based upon a combination of the multiple values. - View Dependent Claims (30, 31, 32, 33, 34, 35, 36)
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Specification