Apparatus and method for biometric identification
First Claim
1. Biometric measuring apparatus for recognizing a person'"'"'s identity based on measurements performed on the person'"'"'s hand, said apparatus comprising:
- support means for supporting a portion of a person'"'"'s hand including at least a plurality of fingers in spread positions and having a predefined background image plane associated therewith;
means for producing and storing a silhouette image of a hand portion placed on said support means, includingimage capture means for viewing said hand portion and said support means from a prearranged first direction;
illumination means for illuminating said hand portion and said support means to present a silhouette image of said hand portion to said image capture means; and
storage means for storing at least a portion of said silhouette image presented to said image capture means;
means for producing and storing a structured light image of said hand portion, includingimage capture means for viewing said hand portion and said support means from a prearranged second viewing direction;
illumination means for directing a structured light pattern onto said hand portion from a prearranged direction substantially different from said second viewing direction to present to said image capture means a structured light image comprising at least one element of said structured light pattern striking a surface region of at least one of said fingers at a position displaced from a precalibrated striking position on said background image plane in the absence of said finger, the magnitude of said position displacement providing measurement data on finger height characteristics; and
storage means for storing at least a portion of said structure light image;
means for analyzing said stored silhouette image and said stored structure light image to produce hand feature data, including hand feature data derived at least in part from said measurement data on finger height characteristics;
means for storing hand enrollment data comprising said hand feature data obtained during a hand enrollment operation cycle;
means for storing hand bid data comprising said hand feature data obtained during a hand bid operation cycle; and
means for comparing hand bid data with hand enrollment data to decide on the basis of prearranged decision criteria whether said hand bid data and said hand enrollment data were produced by the same hand portion.
1 Assignment
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Accused Products
Abstract
Biometric measuring apparatus for recognizing a person'"'"'s identity based on measurements performed on the person'"'"'s hand. An arrangement for producing and storing a silhouette image of at least a portion of a person'"'"'s hand is combined with an arrangement for producing and storing a structured light image of the same portion of a person'"'"'s hand. An analyzing device analyzes the stored images to produce hand feature data. The silhouette image provides finger silhouette feature data and the structured light image provides finger height characteristic data. The apparatus stores hand feature data obtained during a hand enrollment operation cycle to compare with hand feature data produced in a subsequent hand bid operation cycle to determine if the person has previously been enrolled on the apparatus.
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Citations
19 Claims
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1. Biometric measuring apparatus for recognizing a person'"'"'s identity based on measurements performed on the person'"'"'s hand, said apparatus comprising:
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support means for supporting a portion of a person'"'"'s hand including at least a plurality of fingers in spread positions and having a predefined background image plane associated therewith; means for producing and storing a silhouette image of a hand portion placed on said support means, including image capture means for viewing said hand portion and said support means from a prearranged first direction; illumination means for illuminating said hand portion and said support means to present a silhouette image of said hand portion to said image capture means; and storage means for storing at least a portion of said silhouette image presented to said image capture means; means for producing and storing a structured light image of said hand portion, including image capture means for viewing said hand portion and said support means from a prearranged second viewing direction; illumination means for directing a structured light pattern onto said hand portion from a prearranged direction substantially different from said second viewing direction to present to said image capture means a structured light image comprising at least one element of said structured light pattern striking a surface region of at least one of said fingers at a position displaced from a precalibrated striking position on said background image plane in the absence of said finger, the magnitude of said position displacement providing measurement data on finger height characteristics; and storage means for storing at least a portion of said structure light image; means for analyzing said stored silhouette image and said stored structure light image to produce hand feature data, including hand feature data derived at least in part from said measurement data on finger height characteristics; means for storing hand enrollment data comprising said hand feature data obtained during a hand enrollment operation cycle; means for storing hand bid data comprising said hand feature data obtained during a hand bid operation cycle; and means for comparing hand bid data with hand enrollment data to decide on the basis of prearranged decision criteria whether said hand bid data and said hand enrollment data were produced by the same hand portion.
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2. Biometric measuring apparatus for recognizing a person'"'"'s identity based on measurements performed on the person'"'"'s hand, said apparatus comprising:
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support means for supporting a portion of a person'"'"'s hand including at least a plurality of fingers in spread positions and having a predefined background image plane associated therewith; image capture means for viewing said hand portion from a prearranged image viewing direction; means for producing and storing a silhouette image of a hand portion placed on said support means, including first illumination means operative during a silhouette image capture period for illuminating said hand portion to present a silhouette image of said hand portion to said image capture means; and first storage means for storing at least a portion of said silhouette image; means for producing and storing a structured light image of said hand portion, including second illumination means operative during a structured light image capture period for directing a structured light pattern onto at least one of said fingers from a prearranged direction substantially different from said image viewing direction to present to said image capture means a structured light image comprising an element of said structured light pattern striking a surface region of at least one of said fingers at a position displaced from a precalibrated striking position on said background image plane in the absence of said finger, the magnitude of said position displacement providing measurement data on finger height characteristics; and storage means for storing at least a portion of said structure light image; means for analyzing said stored silhouette image and said stored structured light image to produce hand feature data, including hand feature data derived at least in part from said measurement data on finger height characteristics; means for storing hand enrollment data comprising said hand feature data obtained during a hand enrollment operation cycle; means for storing hand bid data comprising said hand feature data obtained during a hand bid operation cycle; and means for comparing hand bid data with hand enrollment data to decide on the basis of prearranged decision criteria whether said hand bid data and said hand enrollment data were produced by the same hand portion. - View Dependent Claims (3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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14. In biometric measuring apparatus for recognizing a person'"'"'s identity based on measurements of the person'"'"'s hand, the combination comprising:
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support means on which at least a portion of the hand of a person may be placed including at least one finger; image capture means for viewing said support means from a prearranged image viewing direction and for capturing and storing an image of a hand portion placed thereon; first illumination means for illuminating said support means and a hand portion placed thereon to present to said image capture means a silhouette image of said hand portion; second illumination means for illuminating said support means and said same hand portion placed thereon with a structured light illumination pattern directed toward said support means from a prearranged second illumination direction substantially different from said prearranged image viewing direction to thereby present to said image capture means a structured light image of said hand portion to provide measurement data on finger height characteristics; and image acquisition means coupled to said image capture means, said first illumination means and said second illumination means for operating said image capture means and said first illumination means during a silhouette image capture period to acquire and store said silhouette image of said hand portion and for operating said image capture means and said second illumination means during a structured light image capture period to acquire and store said structured light image of said hand portion, wherein said support means comprises a platen having a predefined background image plane associated therewith; said second illumination means comprises means operative during said structured light image capture period for directing a structured light pattern in the form of at least one focused beam segment onto at least one of said fingers thereby to present to said image capture means a structured light image comprising an image element at a position displaced from a precalibrated striking position on said background image plane in the absence of said finger, the magnitude of said position displacement providing said finger height characteristic data; and
whereinsaid predefined background image plane is substantially retro-reflective surface on said platen; said first illumination means comprises a circular array of light sources for producing a substantially uniform flood lighting of said platen and any hand portion placed thereon; said image capture means comprises an image forming lens and an image sensing device mounted coaxial with said circular array of light sources; and said second illumination means comprises an array of light sources, and means mounted in front of said array for forming light emitted from said array into a structured light pattern striking said platen from said prearranged second illumination direction. - View Dependent Claims (15, 16, 17, 18, 19)
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Specification