The Experts below are selected from a list of 121125 Experts worldwide ranked by ideXlab platform
Graham Leedham - One of the best experts on this subject based on the ideXlab platform.
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near and far Infrared Imaging for vein pattern biometrics
Advanced Video and Signal Based Surveillance, 2006Co-Authors: Lingyu Wang, Graham LeedhamAbstract:This paper investigates two Infrared Imaging technologies, far-Infrared thermography and near-Infrared Imaging, to acquire hand vein pattern images for biometric purposes. The Imaging principles for both technologies are studied in depth. Experiments involving data acquisition from various parts of hand, including the back of the hand, palm, and wrist are described using a population of 150 participants using both near and far Infrared Imaging techniques. Comparison and analysis of the data collected show that far-Infrared thermography has difficulties in capturing vein images in the palm, and wrist. However, while it is more suitable for capturing the large veins in the back of the hand, it is sensitive to ambient conditions and human body condition and does not provide a stable image quality. On the other hand, near-Infrared Imaging produces good quality images when capturing vein patterns in the back of the hand, palm, and wrist. It is more tolerant to changes in environmental and body condition, but it also faces the problem of disruption due to skin features such as hairs and line patterns. An initial vein pattern biometric system is implemented. The results show that all the test subjects can be correctly identified.
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AVSS - Near- and Far- Infrared Imaging for Vein Pattern Biometrics
2006 IEEE International Conference on Video and Signal Based Surveillance, 2006Co-Authors: Lingyu Wang, Graham LeedhamAbstract:This paper investigates two Infrared Imaging technologies, far-Infrared thermography and near-Infrared Imaging, to acquire hand vein pattern images for biometric purposes. The Imaging principles for both technologies are studied in depth. Experiments involving data acquisition from various parts of hand, including the back of the hand, palm, and wrist are described using a population of 150 participants using both near and far Infrared Imaging techniques. Comparison and analysis of the data collected show that far-Infrared thermography has difficulties in capturing vein images in the palm, and wrist. However, while it is more suitable for capturing the large veins in the back of the hand, it is sensitive to ambient conditions and human body condition and does not provide a stable image quality. On the other hand, near-Infrared Imaging produces good quality images when capturing vein patterns in the back of the hand, palm, and wrist. It is more tolerant to changes in environmental and body condition, but it also faces the problem of disruption due to skin features such as hairs and line patterns. An initial vein pattern biometric system is implemented. The results show that all the test subjects can be correctly identified.
Wallace M Porter - One of the best experts on this subject based on the ideXlab platform.
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the airborne visible Infrared Imaging spectrometer aviris
Remote Sensing of Environment, 1993Co-Authors: Gregg Vane, Robert O Green, Thomas G Chrien, Harry T Enmark, Earl G Hansen, Wallace M PorterAbstract:Abstract The Airborne Visible/Infrared Imaging Spectrometer (AVIRIS) is a facility consisting of a flight system, a ground data system, a calibration facility, and a full-time operations team. The facility was developed by the Jet Propulsion Laboratory (JPL) under funding from the National Aeronautics and Space Administration (NASA). NASA also provides funding for operations and maintenance. The flight system is a whisk-broom imager that acquires data in 224 narrow, contiguous spectral bands covering the solar reflected portion of the electromagnetic spectrum. It is flown aboard the NASA high altitude ER-2 research aircraft. The ground data system is a facility dedicated to the processing and distribution of data acquired by AVIRIS. It operates year round at JPL. The calibration facility consists of a calibration laboratory at JPL and a suite of field instruments and procedures for performing inflight calibration of AVIRIS. A small team of engineers, technicians and scientists supports a yearly operations schedule that includes 6 months of flight operations, 6 months of routine ground maintenance of the flight system, and year-round data processing and distribution. Details of the AVIRIS system, its performance history, and future plans are described.
Robert L. Thomas - One of the best experts on this subject based on the ideXlab platform.
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Sonic Infrared Imaging NDE
Smart Structures and Materials 2005: Sensors and Smart Structures Technologies for Civil Mechanical and Aerospace Systems, 2005Co-Authors: Xiaoyan Han, Jianping Lu, Sarwar Islam, Wei Li, Zhi Zeng, Lawrence D. Favro, Golam Newaz, Robert L. ThomasAbstract:We describe Sonic Infrared Imaging NDE for materials and structures. In this Imaging technique, a short ultrasonic pulse is applied to the structure/material to cause heating of the defects, while an Infrared camera images the time evolution of the heating effect to identify the defective areas in the target. The heating effect is astonishing. In this paper, we'll include our study of Sonic IR Imaging NDE on aircraft structure specimens, automotive specimens, etc. for metals, composites, ceramics, addressing fatigue cracks, and delaminations/disbonds. Some fundamental issues related to Sonic IR Imaging NDE are discussed in this paper as well.
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acoustic chaos for enhanced detectability of cracks by sonic Infrared Imaging
Journal of Applied Physics, 2004Co-Authors: Xiaoyan Han, Zhi Zeng, Lawrence D. Favro, Golam Newaz, Md Sawar Islam, V R Loggins, E Yitamben, Robert L. ThomasAbstract:The technique of sonic Infrared Imaging (SIR) consists of the excitation of an object with a short pulse of 15 to 40 kHz sound, in combination with IR Imaging of the object’s surface temperature as a function of time. Sonic Infrared Imaging is effective for detecting surface and subsurface cracks. The recent discovery of acoustic chaos has provided a means of greatly enhancing the effectiveness of SIR. We describe the properties of chaotic sound in the context of SIR crack detection, and show examples of the enhancement of the detectability of cracks through the use of chaotic sound.
Lingyu Wang - One of the best experts on this subject based on the ideXlab platform.
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near and far Infrared Imaging for vein pattern biometrics
Advanced Video and Signal Based Surveillance, 2006Co-Authors: Lingyu Wang, Graham LeedhamAbstract:This paper investigates two Infrared Imaging technologies, far-Infrared thermography and near-Infrared Imaging, to acquire hand vein pattern images for biometric purposes. The Imaging principles for both technologies are studied in depth. Experiments involving data acquisition from various parts of hand, including the back of the hand, palm, and wrist are described using a population of 150 participants using both near and far Infrared Imaging techniques. Comparison and analysis of the data collected show that far-Infrared thermography has difficulties in capturing vein images in the palm, and wrist. However, while it is more suitable for capturing the large veins in the back of the hand, it is sensitive to ambient conditions and human body condition and does not provide a stable image quality. On the other hand, near-Infrared Imaging produces good quality images when capturing vein patterns in the back of the hand, palm, and wrist. It is more tolerant to changes in environmental and body condition, but it also faces the problem of disruption due to skin features such as hairs and line patterns. An initial vein pattern biometric system is implemented. The results show that all the test subjects can be correctly identified.
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AVSS - Near- and Far- Infrared Imaging for Vein Pattern Biometrics
2006 IEEE International Conference on Video and Signal Based Surveillance, 2006Co-Authors: Lingyu Wang, Graham LeedhamAbstract:This paper investigates two Infrared Imaging technologies, far-Infrared thermography and near-Infrared Imaging, to acquire hand vein pattern images for biometric purposes. The Imaging principles for both technologies are studied in depth. Experiments involving data acquisition from various parts of hand, including the back of the hand, palm, and wrist are described using a population of 150 participants using both near and far Infrared Imaging techniques. Comparison and analysis of the data collected show that far-Infrared thermography has difficulties in capturing vein images in the palm, and wrist. However, while it is more suitable for capturing the large veins in the back of the hand, it is sensitive to ambient conditions and human body condition and does not provide a stable image quality. On the other hand, near-Infrared Imaging produces good quality images when capturing vein patterns in the back of the hand, palm, and wrist. It is more tolerant to changes in environmental and body condition, but it also faces the problem of disruption due to skin features such as hairs and line patterns. An initial vein pattern biometric system is implemented. The results show that all the test subjects can be correctly identified.
Gregg Vane - One of the best experts on this subject based on the ideXlab platform.
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the airborne visible Infrared Imaging spectrometer aviris
Remote Sensing of Environment, 1993Co-Authors: Gregg Vane, Robert O Green, Thomas G Chrien, Harry T Enmark, Earl G Hansen, Wallace M PorterAbstract:Abstract The Airborne Visible/Infrared Imaging Spectrometer (AVIRIS) is a facility consisting of a flight system, a ground data system, a calibration facility, and a full-time operations team. The facility was developed by the Jet Propulsion Laboratory (JPL) under funding from the National Aeronautics and Space Administration (NASA). NASA also provides funding for operations and maintenance. The flight system is a whisk-broom imager that acquires data in 224 narrow, contiguous spectral bands covering the solar reflected portion of the electromagnetic spectrum. It is flown aboard the NASA high altitude ER-2 research aircraft. The ground data system is a facility dedicated to the processing and distribution of data acquired by AVIRIS. It operates year round at JPL. The calibration facility consists of a calibration laboratory at JPL and a suite of field instruments and procedures for performing inflight calibration of AVIRIS. A small team of engineers, technicians and scientists supports a yearly operations schedule that includes 6 months of flight operations, 6 months of routine ground maintenance of the flight system, and year-round data processing and distribution. Details of the AVIRIS system, its performance history, and future plans are described.
