In general, one aspect disclosed features a fingerprint scanner, comprising: a platen comprising a light-reflecting surface; a light source configured to emit light rays to illuminate a finger placed in proximity to the light-reflecting surface of the platen; and a sensor configured to capture image data of the finger in proximity to the light-reflecting surface of the platen; wherein the sensor and the platen are positioned relative to one another so that the sensor detects light having an axis of propagation which is at an angle relative to a surface normal of the platen, wherein the angle is greater than the critical angle corresponding to an interface of the platen and water, and less than the critical angle corresponding to an interface of the platen and the finger being imaged.
A fingerprint reader comprises a platen comprising a light-reflecting surface; a light source configured to emit light rays to illuminate a subject placed in contact with the light-reflecting surface of the platen; a camera configured to capture image data of the subject in contact with the light-reflecting surface of the platen; multiple optical elements arranged in an optical path between the platen and the camera; and an optical chassis comprising: multiple parallel raceway plates, the raceway plates fabricated from carbon fiber, and multiple crossmembers connecting pairs of the raceway plates, wherein the multiple optical elements are disposed in the multiple crossmembers.
A fingerprint reader comprises a platen comprising a light-reflecting surface; a light source configured to emit light rays to illuminate a subject placed in contact with the light-reflecting surface of the platen; a camera configured to capture image data of the subject in contact with the light-reflecting surface of the platen; multiple optical elements arranged in an optical path between the platen and the camera; and an optical chassis comprising: multiple parallel raceway plates, the raceway plates fabricated from carbon fiber, and multiple crossmembers connecting pairs of the raceway plates, wherein the multiple optical elements are disposed in the multiple crossmembers.
Systems and methods for generating a three-dimensional representation of a surface using frustrated total internal reflection. The system may obtain a two-dimensional image of an object in close proximity to an imaging surface. The intensity of the electromagnetic radiation received for individual points on the object may be determined. The system may determine a distance between the imaging surface and the object at each of the individual points based on a correlation between the electromagnetic radiation transmitted towards the imaging surface and the electromagnetic radiation reflected from the imaging surface. The determined intensity of the electromagnetic radiation may indicate the electromagnetic radiation reflected from the imaging surface. A three-dimensional representation of the object may be generated based on the two-dimensional image and/or the determined distances between the imaging surface and the object at each of the individual points.
One or more features of a friction ridge signature of a subject may be identified based on information representing a three-dimensional topography of friction ridges of the subject. Information representing the three-dimensional topography of the friction ridges of the subject may be received. One or more level-three features of the friction ridge signature of the subject may be identified based on the information representing the three-dimensional topography of the friction ridges of the subject. The one or more level-three features may include one or more topographical ridge peaks, topographical ridge notches, topographical ridge passes, pores, and/or other information.
Systems and methods for generating a three-dimensional representation of a surface using frustrated total internal reflection. The system may obtain a two-dimensional image of an object in close proximity to an imaging surface. The intensity of the electromagnetic radiation received for individual points on the object may be determined. The system may determine a distance between the imaging surface and the object at each of the individual points based on a correlation between the electromagnetic radiation transmitted towards the imaging surface and the electromagnetic radiation reflected from the imaging surface. The determined intensity of the electromagnetic radiation may indicate the electromagnetic radiation reflected from the imaging surface. A three-dimensional representation of the object may be generated based on the two-dimensional image and/or the determined distances between the imaging surface and the object at each of the individual points.
One or more features of a friction ridge signature of a subject may be identified based on information representing a three-dimensional topography of friction ridges of the subject. Information representing the three-dimensional topography of the friction ridges of the subject may be received. One or more level-three features of the friction ridge signature of the subject may be identified based on the information representing the three-dimensional topography of the friction ridges of the subject. The one or more level-three features may include one or more topographical ridge peaks, topographical ridge notches, topographical ridge passes, pores, and/or other information.
A representation of variations in elevation of friction ridges in a friction ridge pattern of a subject may be generated. A sequence of images captured over a time period may be obtained. Individual images in the sequence of images may indicate areas of engagement between an imaging surface and the friction ridge pattern of the subject when the individual images are captured. Temporal information may be obtained for the individual images. The temporal information for the individual images may be used to aggregate the individual images in the sequence of images into an aggregated representation of the friction ridge pattern. The aggregation may be accomplished such that the aggregated representation depicts the areas of engagement of the friction ridge pattern with the imaging surface at different elevations of the friction ridge pattern.
One or more features of a friction ridge signature of a subject may be identified based on information representing a three-dimensional topography of friction ridges of the subject. Information representing the three-dimensional topography of the friction ridges of the subject may be received. One or more level- three features of the friction ridge signature of the subject may be identified based on the information representing the three-dimensional topography of the friction ridges of the subject. The one or more level-three features may include one or more topographical ridge peaks, topographical ridge notches, topographical ridge passes, pores, and/or other information.
A representation of variations in elevation of friction ridges in a friction ridge pattern of a subject may be generated. A sequence of images captured over a time period may be obtained. Individual images in the sequence of images may indicate areas of engagement between an imaging surface and the friction ridge pattern of the subject when the individual images are captured. Temporal information may be obtained for the individual images. The temporal information for the individual images may be used to aggregate the individual images in the sequence of images into an aggregated representation of the friction ridge pattern. The aggregation may be accomplished such that the aggregated representation depicts the areas of engagement of the friction ridge pattern with the imaging surface at different elevations of the friction ridge pattern.
A total internal reflection based imaging system may include a light transmitting member having an imaging surface. A pressure sensitive membrane may be arranged on the imaging surface. The pressure sensitive membrane may include a top surface, a bottom surface, and an elastic deformable film forming at least a portion of the top surface. The imaging system may include a textured surface disposed between the pressure sensitive membrane and the imaging surface. An application of pressure on the top surface may deform the deformable film to reduce a distance between the deformable film and the imaging surface. A light source may be configured to emit a light towards the imaging surface such that reduced total internal reflection of the light occurs where the bottom surface of the pressure sensitive membrane contacts the imaging surface. A sensor may be configured to capture the light reflected from the imaging surface.
G06F 3/041 - Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means
G06F 3/044 - Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means by capacitive means
G06F 3/045 - Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means using resistive elements, e.g. a single continuous surface or two parallel surfaces put in contact
G06F 3/048 - Interaction techniques based on graphical user interfaces [GUI]
12.
Systems and methods for capturing images using a pressure sensitive membrane
A total internal reflection based imaging system may include a light transmitting member having an imaging surface. A pressure sensitive membrane may be arranged on the imaging surface. The pressure sensitive membrane may include a top surface, a bottom surface, and an elastic deformable film forming at least a portion of the top surface. The imaging system may include a textured surface disposed between the pressure sensitive membrane and the imaging surface. An application of pressure on the top surface may deform the deformable film to reduce a distance between the deformable film and the imaging surface. A light source may be configured to emit a light towards the imaging surface such that reduced total internal reflection of the light occurs where the bottom surface of the pressure sensitive membrane contacts the imaging surface. A sensor may be configured to capture the light reflected from the imaging surface.
A software implemented system and method for algorithmic correction of systematic image distortions within fingerprint imaging systems. The system and method may implement a three dimensional geometric model of a fingerprint imaging system to discover where a configuration prescribed by a conceptual fingerprint imaging system and an actual configuration of a manufactured fingerprint imaging system differ. By describing this difference using the geometric model, images captured by the manufactured fingerprint imaging system can be rectified in operational use to generate rectified images with relatively low amounts of distortion present.
A fingerprint imaging system configured to capture an image of a friction ridge pattern of a subject (e.g., a fingerprint, a palm print, a hand print, a footprint, etc.). The system may include one or more components that reduce the impact of ambient light on the performance of the system. In some implementations, the system may reduce the impact of ambient light without requiring additional power (e.g., to generate an increased amount of radiation) and without including “external” hoods and/or covers designed to block ambient light prior to the ambient light entering system. Instead, the system may reduce the impact of ambient light on performance by blocking ambient light internally within the system along an optical path of radiation used to electronically capture an image of the friction ridge pattern.
A fingerprint imaging system configured to capture an image of a friction ridge pattern of a subject (e.g., a fingerprint, a palm print, a hand print, a footprint, etc.). The system may include one or more components that reduce the impact of ambient light on the performance of the system. In some implementations, the system may reduce the impact of ambient light without requiring additional power (e.g., to generate an increased amount of radiation) and without including “external” hoods and/or covers designed to block ambient light prior to the ambient light entering system. Instead, the system may reduce the impact of ambient light on performance by blocking ambient light internally within the system along an optical path of radiation used to electronically capture an image of the friction ridge pattern.
A system and method is provided that simultaneously or consecutively collects DNA samples and ridge and valley signatures from the same subject during the same collection window that adds value to forensic data collection processes. The collection of the DNA samples and ridge and valley signatures occur during the same collection window to assured the DNA sample and ridge and valley signatures identify the same individual.
The present invention provides a large format fingerprint capture apparatus, system and method that is low power, compact, and lightweight and has a platen area greater than 3.0 square inches. The present system is typically powered, controlled, and exchanges data over a single data/control/power connection to a host PC, e.g., a desk top computer, PDA, or laptop computer although the system can also be used in a wireless fashion with a power subsystem so no physical connections are required. In a preferred embodiment the large format fingerprint device is directly connected to a completely disconnected portable PC, such as a laptop having only a battery power source. The primary system components of the present invention combine to minimize power, size and weight and, thus, enhance portability and battery life. The system typically includes a light source, a prism, a camera (including the lens), and a case. Optional elements comprise holographic elements such as gratings and holographic optical elements (HOEs), a battery subsystem, magnetic stripe reader, barcode reader, platen heater, platen blower, and mirrors to divert the image beam.
A fingerprint imaging system configured to capture an image of a friction ridge pattern of a subject (e.g., a fingerprint, a palm print, a hand print, a footprint, etc.). The system may include one or more components that reduce the impact of ambient light on the performance of the system. In some implementations, the system may reduce the impact of ambient light without requiring additional power (e.g., to generate an increased amount of radiation) and without including 'external' hoods and/or covers designed to block ambient light prior to the ambient light entering system. Instead, the system may reduce the impact of ambient light on performance by blocking ambient light internally within the system along an optical path of radiation used to electronically capture an image of the friction ridge pattern.
A fingerprint imaging system configured to capture an image of a friction ridge pattern of a subject (e.g., a fingerprint, a palm print, a hand print, a footprint, etc.). The system may include one or more components that reduce the impact of ambient light on the performance of the system. In some implementations, the system may reduce the impact of ambient light without requiring additional power (e.g., to generate an increased amount of radiation) and without including “external” hoods and/or covers designed to block ambient light prior to the ambient light entering system. Instead, the system may reduce the impact of ambient light on performance by blocking ambient light internally within the system along an optical path of radiation used to electronically capture an image of the friction ridge pattern.
A software implemented system for algorithmic correction of systematic image distortions within fingerprint imaging systems. The system may implement a three dimensional geometric model of a fingerprint imaging system to discover where a configuration prescribed by a conceptual fingerprint imaging system and an actual configuration of a manufactured fingerprint imaging system differ. By describing this difference using the model, images captured by the manufactured fingerprint imaging system can be rectified to generate rectified images with relatively low amounts of distortion present. Rectification to remove distortion based on the model, without physically adjusting and/or correcting the manufactured fingerprint imaging system or its components, may enable the fingerprint imaging system to be manufactured with relatively lower tolerances without degrading a precision of the images generated by the system, potentially enabling enhanced precision of generated images without increasing various costs of the fingerprint imaging system (or its components) generating the images.
The present invention provides a large format fingerprint capture apparatus, system and method that is low power, compact, and lightweight and has a platen area greater than 3.0 square inches. The present system is typically powered, controlled, and exchanges data over a single data/control/power connection to a host PC, e.g., a desk top computer, PDA, or laptop computer although the system can also be used in a wireless fashion with a power subsystem so no physical connections are required. In a preferred embodiment the large format fingerprint device is directly connected to a completely disconnected portable PC, such as a laptop having only a battery power source. The primary system components of the present invention combine to minimize power, size and weight and, thus, enhance portability and battery life. The system typically includes a light source, a prism, a camera (including the lens), and a case. Optional elements comprise holographic elements such as gratings and holographic optical elements (HOEs), a battery subsystem, magnetic stripe reader, barcode reader, platen heater, platen blower, and mirrors to divert the image beam.
A software implemented system and method for algorithmic correction of systematic image distortions within fingerprint imaging systems. The system and method may implement a three dimensional geometric model of a fingerprint imaging system to discover where a predicted configuration and the actual configuration of a system differ. By describing this difference using the geometric mode images captured by the manufactured fingerprint imaging system can be rectified in operational use to generate rectified images. Rectifying the images to remove distortion based on the geometric model, without physically adjusting and/or correcting the manufactured fingerprint imaging system or its components.
23.
LOW POWER FINGERPRINT CAPTURE SYSTEM, APPARATUS, AND METHOD
The present invention provides a large format fingerprint capture apparatus, system and method that is low power, compact, and lightweight and has a platen area greater than 3.0 square inches. The present system is typically powered, controlled, and exchanges data over a single data/control/power connection to a host PC, e.g., a desk top computer, PDA, or laptop computer although the system can also be used in a wireless fashion with a power subsystem so no physical connections are required. In a preferred embodiment the large format fingerprint device is directly connected to a completely disconnected portable PC, such as a laptop having only a battery power source. The primary system components of the present invention combine to minimize power, size and weight and, thus, enhance portability and battery life. The system typically includes a light source, a prism, a camera (including the lens), and a case. Optional elements comprise holographic elements such as gratings and holographic optical elements (HOEs), a battery subsystem, magnetic stripe reader, barcode reader, platen heater, platen blower, and mirrors to divert the image beam.
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