Swipe imager with improved sensing control features
First Claim
1. A biometric sensing device comprising:
- a swipe sensing pad for having a biological surface passed there across in a swipe direction and comprising an array of sensing elements having at least two rows and two columns for sensing variation in the biological surface and for providing image data forming an image data sample in dependence thereon; and
at least one spacer adjacent said swipe sensing pad in said swipe direction, the axis of the spacer being parallel to the longitudinal direction of the swipe sensing pad, for providing a reproducible separation of a biological surface being imaged from the swipe sensing pad during imaging of the biological surface, and for substantially effecting a same distortion due to friction in the image data for different image data samples from a same biometric information source.
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Abstract
A fingerprint sensing device and recognition system includes a capacitive array of sense elements. A plurality of images is combined to form a composite image having an area that is greater than the area of a single captured image. The sensing device also features a spacer or spacers to allow for a reproducible sensing of the same fingerprint. Optionally, the spacer or spacers include a roller or rollers, which further optionally in conjunction with a monitoring device for determining motion of a surface being imaged device. Also optionally, th sensing devices includes a guiding channel as to allow for a well defined motion of the biological surface to be imaged. A method for sensing a biological surface using the fingerprint sensing device is also disclosed.
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Citations
53 Claims
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1. A biometric sensing device comprising:
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a swipe sensing pad for having a biological surface passed there across in a swipe direction and comprising an array of sensing elements having at least two rows and two columns for sensing variation in the biological surface and for providing image data forming an image data sample in dependence thereon; and at least one spacer adjacent said swipe sensing pad in said swipe direction, the axis of the spacer being parallel to the longitudinal direction of the swipe sensing pad, for providing a reproducible separation of a biological surface being imaged from the swipe sensing pad during imaging of the biological surface, and for substantially effecting a same distortion due to friction in the image data for different image data samples from a same biometric information source. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
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16. A biometric sensing device comprising:
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a swipe sensing pad for having a biological surface passed there across in a swipe direction and comprising an array of sensing elements having at least two rows and two columns for sensing variation in the biological surface and for providing image data forming an image data sample in dependence thereon; at least one spacer adjacent said swipe sensing pad in said swipe direction, the axis of the spacer being parallel to the longitudinal direction of the swipe sensing pad, for providing a reproducible separation of a biological surface being imaged from the swipe sensing pad during imaging of the biological surface, and for substantially effecting a same distortion due to friction in the image data for different image data samples from a same biometric information source; and a processor for receiving the image data from the swipe sensing pad and for processing the received image data to form a composite image of the biological surface from the image data. - View Dependent Claims (17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32)
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33. A biometric sensing device comprising:
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a swipe sensing pad for having a biological surface passed there across in a swipe direction and comprising an array of sensing elements having at least two rows and two columns for sensing variation in the biological surface and for providing image data forming an image data sample in dependence thereon; a processor for receiving and processing data, the swipe sensing pad being connected to the processor; at least one roller, the roller being provided adjacent the swipe sensing pad in the swipe direction, the axis of the roller being parallel to the longitudinal direction of the swipe sensing pad, where the swipe direction is perpendicular to the axis of the roller; and wherein the height of the roller is higher than the height of the swipe sensing pad. - View Dependent Claims (34, 35, 36, 37, 38)
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39. A biometric sensing device comprising:
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a swipe sensing pad for having a biological surface passed there across in a swipe direction and comprising an array of sensing elements having at least two rows and two columns for sensing variation in the biological surface and for providing image data forming an image data sample in dependence thereon; a processor for receiving and processing data, the swipe sensing pad being connected to the processor; and at least one roller, the roller being provided adjacent the swipe sensing pad in the swipe direction, the axis of the roller being parallel to the longitudinal direction of the swipe sensing pad, where the swipe direction is perpendicular to the axis of the roller; and
,a guiding channel having a base and two side units, the base and the two side units constituting the boundaries of the guiding channel, the side units being attached to the base, and spaced apart by a predefined distance defining side boundaries constraining the biological surface to movement in the swiping direction. - View Dependent Claims (40, 41, 42, 43, 44, 45, 46)
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47. A biometric sensing device comprising:
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a swipe sensing pad for having a biological surface passed there across in a swipe direction and comprising an array of sensing elements having at least two rows and two columns for sensing variation in the biological surface and for providing image data forming an image data sample in dependence thereon; a processor for receiving and processing data, the swipe sensing pad being connected to the processor; and
a generally cylindrical platen having a continuous outer surface for supporting the plurality of arrays of sensing elements, where the swipe direction is perpendicular to the axis of the platen; and
, the platen being rollingly engaged to a base so as to rotate in the swipe direction. - View Dependent Claims (48, 49, 50, 53)
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51. A method for sensing a biological surface comprising the steps of:
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providing a reproducible separation of a biological surface to be imaged from a swipe sensing pad using at least one spacer adjacent said swipe sensing pad in a swipe direction, the axis of the spacer being parallel to the longitudinal direction of the swipe sensing pad, during imaging of the biological surface; moving said biological surface to be imaged across said swipe sensing pad in a swipe direction; and restricting the motion of the biological surface to follow the swipe direction within a guide path restricted on either side of said guide path while maintaining said separation from said swipe sensing pad while moving across the swipe sensing pad. - View Dependent Claims (52)
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Specification