Topic
Night vision
About: Night vision is a research topic. Over the lifetime, 6004 publications have been published within this topic receiving 67372 citations.
Papers published on a yearly basis
Papers
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TL;DR: Even small amounts of blur had a significant detrimental effect on nighttime pedestrian recognition and biomotion retro-reflective clothing was effective, even under moderately degraded visibility conditions, for both young and older drivers.
Abstract: PURPOSE: The aim of this study was to systematically investigate the effect of different levels of refractive blur and driver age on nighttime pedestrian recognition and determine whether clothing that has been shown to improve pedestrian conspicuity is robust to the effects of blur. METHODS: Nighttime pedestrian recognition was measured for 24 visually normal participants (12 younger mean = 24.9 ± 4.5 years and 12 older adults mean = 77.6 ± 5.7 years) for three levels of binocular blur (+0.50 diopter [D], +1.00 D, +2.00 D) compared with baseline (optimal refractive correction). Pedestrians walked in place on a closed road circuit and wore one of three clothing conditions: everyday clothing, a retro-reflective vest, and retro-reflective tape positioned on the extremities in a configuration that conveyed biological motion (known as "biomotion"); the order of conditions was randomized among participants. Pedestrian recognition distances were recorded for each blur and pedestrian clothing combination while participants drove an instrumented vehicle around a closed road course. RESULTS: The recognition distances for pedestrians were significantly reduced (P CONCLUSIONS: In summary, even small amounts of blur had a significant detrimental effect on nighttime pedestrian recognition. Biomotion retro-reflective clothing was effective, even under moderately degraded visibility conditions, for both young and older drivers. Language: en
22 citations
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TL;DR: An external processor is deployed to apply a fast lookup-table based color transform (the Color-the-Night color mapping principle) to represent the TRICLOBS image in natural daylight colors and to maximize the detectability of thermal targets (using the LWIR signal).
Abstract: We present the design and first test results of the TRICLOBS (TRI-band Color Low-light OBServation) system The TRICLOBS is an all-day all-weather surveillance and navigation tool. Its sensor suite consists of two digital image intensifiers (Photonis ICU's) and an uncooled longwave infrared microbolometer (XenICS Gobi 384). The night vision sensor suite registers the visual (400-700 nm), the near-infrared (700-1000 nm) and the longwave infrared (8-14 m) bands of the electromagnetic spectrum. The optical axes of the three cameras are aligned, using two dichroic beam splitters: an ITO filter to reflect the LWIR part of the incoming radiation into the thermal camera, and a B43-958 hot mirror to split the transmitted radiation into a visual and NIR part. The individual images can be monitored through two LCD displays. The TRICLOBS provides both digital and analog video output. The digital video signals can be transmitted to an external processing unit through an Ethernet connection. The analog video signals can be digitized and stored on on-board harddisks. An external processor is deployed to apply a fast lookup-table based color transform (the Color-the-Night color mapping principle) to represent the TRICLOBS image in natural daylight colors (using information in the visual and NIR bands) and to maximize the detectability of thermal targets (using the LWIR signal). The external processor can also be used to enhance the quality of all individual sensor signals, e.g. through noise reduction and contrast enhancement. © 2009 SPIE.
22 citations
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TL;DR: It is shown that a mobile system for pedestrian detection in severe lighting conditions can be build using state of the art algorithms and widely available hardware.
Abstract: Assistive vision-based solutions for the driver extend the capabilities of human vision and support safe travel. Unfortunately, their widespread usage is generally limited to expensive cars. Interestingly, a high price is most likely a derivative of the costs incurred in the research instead of the value of hardware components. In the article we show that a mobile system for pedestrian detection in severe lighting conditions can be build using state of the art algorithms and widely available hardware. The proposed night-vision system for pedestrian detection processes thermal images using a proprietary ODROID XU4 microcomputer under Ubuntu MATE operating system. We applied a cascade object detector for the task of human silhouette detection in context of thermal imagery and contrasted the results with the state of the art deep learning approach. The experiments conducted prove effectiveness of the proposed solution.
22 citations
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30 Nov 2004
TL;DR: In this article, an electronic camera (26) provided with a lens system and a CCD-sensor, an image processing unit (48) which processes the image received by the camera, and an output signal for a display means associated with each eye, said display being used to reproduce the image, and a reproduction lens system (32, 34) which is arranged downstream from each display means (28, 30).
Abstract: The invention relates to electronic spectacles, in particular night vision spectacles (10), comprising an electronic camera (26) provided with a lens system and a CCD-sensor, an image processing unit (48) which processes the image received by the camera, and an output signal for a display means (28, 39) associated with each eye, said display means being used to reproduce the image, and a reproduction lens system (32, 34) which is arranged downstream from each display means (28, 30). The invention is characterised in that the camera (26), the display means (28, 30) and the reproduction lens system (32, 34) are synchronised in relation to each other such that the image which can be detected by a user, when in use, corresponds to real conditions relating to the represented dimensions without limiting the direct vision of the user.
22 citations
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TL;DR: A polymer dispersed liquid crystal device for operation in the midinfrared region of the electromagnetic spectrum that can be incorporated in thermal imaging systems that utilize pyroelectric vidicons for night vision applications is developed.
Abstract: We have developed a polymer dispersed liquid crystal
(PDLC) device for operation in the midinfrared region of the electromagnetic spectrum. This device can be incorporated in thermal imaging systems that utilize pyroelectric vidicons for night vision applications. The infrared electro-optic properties of several PDLCs
as a function of substrate, droplet size, film thickness, and applied ac voltage are examined using infrared spectroscopy, electro-optic and differential scattering measurements, and static video analysis.
22 citations