LATENT FINGERPRINT DETECTORS AND FINGERPRINT SCANNERS THEREFROM
First Claim
1. An automatic fingerprint system, comprising:
- an optical sensor, comprising;
a first light source that provides a collimated beam for interrogating sample surfaces including a first sample surface within a region of interest; and
a camera comprising a lens and a photodetector array optically coupled to said lens having a camera field of view (FOVCAMERA), wherein said FOVCAMERA is large enough to image at least substantially an entire area of said first sample surface, and wherein said camera is critical angle positioned relative to said first light source to receive specular reflection (glare) from said first sample surface, wherein said camera generates image data from said glare;
wherein said first light source and said camera have substantially equal and opposite numerical apertures (NAs);
a computer or processor having associated memory that includes reference fingerprint templates coupled to receive a digitized form of said image data from said camera, wherein said computer or processor includes data processing software for (i) comparing said digitized form of said image data to said reference fingerprint templates to determine whether said image data includes at least one fingerprint and (ii) for generating a fingerprint image if said fingerprint is determined to be present.
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Accused Products
Abstract
An automatic fingerprint system includes an optical sensor having a first light source that provides a collimated beam for interrogating a first sample surface, and a camera including a lens and a photodetector array having a camera field of view (FOVCAMERA) large enough to image the first sample surface. The camera is critical angle positioned relative to the first light source to receive specular reflection (glare) from the first sample surface to generate image data from the glare. The first light source and camera have substantially equal and opposite numerical apertures (NAs). A computer or processor that includes reference fingerprint templates receives a digitized form of the image data, and includes data processing software for (i) comparing the image data to reference fingerprint templates to determine whether the image data includes at least one fingerprint and (ii) for generating a fingerprint image if the fingerprint is determined to be present.
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Citations
24 Claims
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1. An automatic fingerprint system, comprising:
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an optical sensor, comprising; a first light source that provides a collimated beam for interrogating sample surfaces including a first sample surface within a region of interest; and a camera comprising a lens and a photodetector array optically coupled to said lens having a camera field of view (FOVCAMERA), wherein said FOVCAMERA is large enough to image at least substantially an entire area of said first sample surface, and wherein said camera is critical angle positioned relative to said first light source to receive specular reflection (glare) from said first sample surface, wherein said camera generates image data from said glare; wherein said first light source and said camera have substantially equal and opposite numerical apertures (NAs); a computer or processor having associated memory that includes reference fingerprint templates coupled to receive a digitized form of said image data from said camera, wherein said computer or processor includes data processing software for (i) comparing said digitized form of said image data to said reference fingerprint templates to determine whether said image data includes at least one fingerprint and (ii) for generating a fingerprint image if said fingerprint is determined to be present. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. An automatic fingerprint scanning system, comprising:
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an optical sensor, comprising; a first light source that provides a collimated beam for interrogating sample surfaces including a first sample surface within a region of interest; and a camera comprising a lens and a photodetector array optically coupled to said lens having a camera field of view (FOVCAMERA), wherein said FOVCAMERA is large enough to image at least substantially an entire area of said first sample surface, and wherein said camera is critical angle positioned relative to said first light source to receive specular reflection (glare) from said first sample surface, wherein said camera generates image data from said glare; wherein said first light source and said camera have substantially equal and opposite numerical apertures (NAs); a computer or processor having associated memory that includes reference fingerprint templates coupled to receive a digitized form of said image data from said camera, wherein said computer or processor includes data processing software for (i) comparing said digitized form of said image data to said reference fingerprint templates to determine whether said image data includes at least one fingerprint and (ii) for generating a fingerprint image if said fingerprint is determined to be present, and at least one scanner mechanically coupled to said optical sensor for scanning said optical sensor across a plurality of different surface portions within said region of interest, wherein said critical angle positioning of said first light source to said FOV of said camera is maintained during said scanning. - View Dependent Claims (14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24)
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Specification