LATENT FINGERPRINT DETECTORS AND FINGERPRINT SCANNERS THEREFROM
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Abstract
This document relates to systems and method for latent fingerprint detection using specular reflection (glare). An exemplary system may include a light source alignment portion configured to align a light source at an illumination angle relative to a sample surface such that the light source illuminates a sample surface so that the surface produces specular reflection. The system may also include a specular reflection discriminator that directs the produced specular refection to an optical detector aligned relative to said sample surface at an alignment angle that is substantially equal to an angle of reflection of the produced specular reflection. Preferably, the directed specular reflection does not saturate the optical detector, and the optical detector captures the specular reflection from the sample surface and generates image data using essentially only the specular reflection.
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Citations
59 Claims
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1-39. -39. (canceled)
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40. A latent fingerprint detection system, comprising:
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a light source; a light source alignment portion configured to align the light source at an illumination angle relative to a sample surface, which may possess a latent fingerprint, onto the sample surface such that the light source illuminates the sample surface so that the sample surface produces specular reflection; a specular reflection discriminator configured to direct the produced specular reflection to an optical detector aligned relative to the sample surface at an alignment angle that is substantially equal to an angle of reflection of the produced specular reflection such that the directed specular reflection does not saturate the optical detector; and the optical detector configured to capture the specular reflection from the sample surface and generates image data using essentially only the specular reflection to generate image data of the fingerprint on the sample surface. - View Dependent Claims (41, 42, 43, 44, 45, 46, 47, 48)
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49. A latent fingerprint detection system, comprising:
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a light source alignment portion configured to align a collimated beam of light at an illumination angle relative to a sample surface onto the sample surface to produce specular reflection from the sample surface; an optical detector configured to capture the specular reflection from the sample surface to generate image data for use to determine whether a fingerprint is on the sample surface; and a specular reflection discriminator configured to direct the produced specular reflection to the optical detector aligned relative to the sample surface at an alignment angle that is substantially equal to an angle of reflection of the produced specular reflection such that the directed specular reflection does not saturate the optical detector. - View Dependent Claims (50, 51, 52, 53, 54, 55, 56)
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57. A method comprising:
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aligning a light source at an illumination angle relative to a sample surface onto the sample surface to produce specular reflection from the sample surface with a light source alignment portion; capturing the specular reflection from the sample surface to generate image data for use to determine whether a fingerprint is on the sample surface with an optical detector; and directing the produced specular reflection to the optical detector aligned relative to the sample surface at an alignment angle that is substantially equal to an angle of reflection of the produced specular reflection such that the directed specular reflection does not saturate the optical detector with a specular reflection discriminator. - View Dependent Claims (58, 59)
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Specification