Method and apparatus for fingerprint image reconstruction
First Claim
Patent Images
1. A method of reconstructing a fingerprint image from a series of partial fingerprint images of a finger surface, said method comprising:
- moving the finger surface over a partial fingerprint imager and capturing a series of partial fingerprint image sections of the fingerprint;
calculating the speed at which the partial fingerprint imager traverses the finger surface;
determining if the speed is above a preset fast swipe value;
if the speed is above the preset fast swipe value, filling in any gap intermediate partial fingerprint image segments by generating an additional synthetic partial fingerprint image segment by interpolating between partial fingerprint image segments on either side of the gap;
if the speed is below the preset fast swipe value, then determining if the speed is below a preset slow swipe value;
if the speed is below the preset slow swipe value, detecting any redundant portion of a partial fingerprint image segment; and
reconstructing the fingerprint image of the finger surface using the partial fingerprint image segments and inserting any additional synthetic image segment and removing any redundant portion of any partial fingerprint image segment.
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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. Such improved scanners can use image analysis techniques, such as interpolation between partial fingerprint images to correct for missing data, or discarding redundant partial fingerprint image data, to produce adequate fingerprint images even when the finger has not been applied to the sensor using an optimum technique.
392 Citations
26 Claims
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1. A method of reconstructing a fingerprint image from a series of partial fingerprint images of a finger surface, said method comprising:
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moving the finger surface over a partial fingerprint imager and capturing a series of partial fingerprint image sections of the fingerprint; calculating the speed at which the partial fingerprint imager traverses the finger surface; determining if the speed is above a preset fast swipe value; if the speed is above the preset fast swipe value, filling in any gap intermediate partial fingerprint image segments by generating an additional synthetic partial fingerprint image segment by interpolating between partial fingerprint image segments on either side of the gap; if the speed is below the preset fast swipe value, then determining if the speed is below a preset slow swipe value; if the speed is below the preset slow swipe value, detecting any redundant portion of a partial fingerprint image segment; and reconstructing the fingerprint image of the finger surface using the partial fingerprint image segments and inserting any additional synthetic image segment and removing any redundant portion of any partial fingerprint image segment. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. A method of reconstructing a fingerprint image from a series of partial fingerprint image segments of a finger surface, the method comprising:
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moving the finger surface over a partial fingerprint imager and capturing a series of partial fingerprint image segments of the fingerprint surface at a known rate of partial fingerprint image segment acquisition per second; calculating the speed at which the partial fingerprint imager traverses the finger surface; determining if the speed is above a preset fast swipe value, the fast swipe value being set at a level where there are likely to be gaps between adjacent ones of the partial fingerprint image segments; if the speed is above the preset fast swipe value, filling in any gap intermediate partial fingerprint image segments by generating an additional synthetic partial fingerprint image segment by interpolating between partial fingerprint image segments on either side of the gap; if the speed is below the preset fast swipe value, then determining if the speed is below a preset slow swipe value, the slow swipe value being set at a level where there are likely to be overlaps between adjacent ones of the partial fingerprint image segments; the speed is below the preset slow swipe value, detecting any redundant portion of a partial fingerprint image segment; and reconstructing the fingerprint image of the finger surface using the resulting partial fingerprint image segments and inserting any additional synthetic image segment and removing any redundant portion of any partial fingerprint image segment. - View Dependent Claims (14, 15, 16, 17, 18, 19, 20, 21)
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22. A method of reconstructing a fingerprint image from a series of partial fingerprint images of a finger surface, the method comprising:
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moving the finger surface over a deep finger penetrating radio frequency (RF) based partial fingerprint imager and capturing a series of partial fingerprint image segments of the fingerprint surface at a known rate of partial image segment acquisition per second; calculating the speed at which the partial fingerprint imager traverses the finger surface using a deep finger penetrating radio frequency (RF) based finger position sensor array; determining if the speed is above a preset fast swipe value, the fast swipe value being set at a level where there are likely to be gaps between adjacent ones of the partial fingerprint image setments; if the speed is above the preset fast swipe value, filling in any gap intermediate partial fingerprint image segments by generating an additional synthetic partial fingerprint image segment by interpolating between partial fingerprint image segments on either side of the gap; if the speed is below the preset fast swipe value, then determining if the speed is below a preset slow swipe value, the slow swipe value being set at a level where there are likely to be overlap between adjacent ones of the partial fingerprint image segments; if the speed is below the preset slow swipe value, discarding any redundant portions of partial fingerprint image segments; and reconstructing the fingerprint image of the finger surface using the partial fingerprint image segments and adding in any additional synthetic partial fingerprint image segments and deleting any redundant portions of any partial fingerprint image segment. - View Dependent Claims (23, 24, 25, 26)
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Specification