System for and method of determining pressure on a finger sensor
First Claim
1. A system comprising:
- a. a finger sensor for capturing first and second of sets of image data by contacting the finger sensor; and
b. means for providing a statistical comparison between the first and second sets of image data to determine a total pressure difference.
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Abstract
The present invention discloses a system for and method of calculating pressure differences using a finger sensor. A finger sensor system in accordance with the present invention comprises a finger sensor for capturing first and second of sets of image data by contacting the finger sensor and means for providing a statistical comparison between the first and second sets of image data to determine a total pressure difference. The means for providing a statistical comparison comprises a means for generating first histogram data from the first set of image data and second histogram data from the second set of image data. The means for providing statistical data correlates peaks of the first and second histogram data and also determines differences between variances of the first and second sets of image data.
77 Citations
41 Claims
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1. A system comprising:
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a. a finger sensor for capturing first and second of sets of image data by contacting the finger sensor; and
b. means for providing a statistical comparison between the first and second sets of image data to determine a total pressure difference. - View Dependent Claims (9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21)
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2. The system of claim 2, wherein the means for providing a statistical comparison comprises:
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a. a coarse comparator; and
b. a fine comparator. - View Dependent Claims (3, 4, 5, 6, 7, 8)
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22. A method of determining a pressure difference comprising:
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a. capturing first and second of sets of image data by contacting a finger sensor; and
b. providing a statistical comparison between the first and second sets of image data to determine a total pressure difference. - View Dependent Claims (23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40)
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41. A system for determining a pressure difference comprising:
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a. a finger sensor for capturing two or more sets of finger image data for a finger on the finger sensor;
b. means for comparing a first set of finger image data to a second set of finger image data; and
c. means for using a result of comparing the first set of finger image data to the second set of finger image data to determine whether more or less pressure is applied by the finger on the finger sensor.
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Specification