Night vision

About: Night vision is a research topic. Over the lifetime, 6004 publications have been published within this topic receiving 67372 citations.

Camera in a vehicle

Abstract: Es wird eine Kamera (8) in einem Kraftfahrzeug mit einem Bildsensor (24) vorgeschlagen, wobei die Kamera (8) Primarfunktionen, wie Nachtsichtunterstutzung und/oder Spurverlassenswarnung und/oder Verkehrszeichenerkennung und/oder Ruckfahrhilfe, durch Erfassung der optischen Strahlung des Verkehrsraumes der Umgebung des Kraftfahrzeuges und eine Regensensorfunktion zur Verfugung stellt. It is proposed a camera (8) in a motor vehicle with an image sensor (24), wherein the camera (8) primary functions, such as night vision support and / or lane departure warning and / or traffic sign recognition and / or reversing aid, by detecting the optical radiation of the traffic area of ​​interest of the motor vehicle and a rain sensor function provides.

Display considerations for night and low-illumination viewing

Abstract: An inadequately designed display viewed in the dark can easily cause dazzling glare and affect our night vision. In this paper we test a display design in which the spectral light emission is selected to reduce the impact of the display on night vision performance while at the same time ensuring good display legibility. We use long-wavelength light (red) that is easily visible to daylight vision photoreceptors (cones) but almost invisible to night vision photoreceptors (rods). We verify rod-cone separation in a psychophysical experiment, in which we measure contrast detection in the presence of a colored source of glare. In a separate user study we measure the range of display brightness settings that provide good legibility and are not distracting under low ambient lighting. Our results can serve as a guidelines for designing the displays that change their color scheme at low ambient light levels.

Method for controlling a light source in a night vision surveillance system

Abstract: A method for controlling a light source in a night vision system is provided. The method first computes a pulse width Tp=2(d−d1)/c, where c is the light speed, according to parameters of a desired observing distance d and a shortest distance d1 of the back-scattering light that enters the light sensor, such as a low-light-level camera. According to the definition of duty cycle D, it is determined by D=(1−d1/d)/(2−d1/d). According to the parameters of the desired observing distance and the pulse width, control signals are generated by a pulse signal controller to control a pulsed active-light illuminator with proper emitting period and a gated light sensor with proper gated-on period.

Effect of different runway size on pilot performance during simulated night landing approaches

Abstract: Both anecdotal reports from pilots and theories of visual cues would predict lower approaches to narrow or long runways than to wide and short runways. Similar, practice approaches made by pilots to a particular width of runway should lead to an increase in subsequent approach angles flown to wider runways and a decrease in approach angles flown to narrower runways. Two experiments with instrument-rated pilots made quantitative tests and these predictions. In Experiment I, three pilots flew simulated approaches and landings in a fixed-base simulator with a computer-generated image visual display. Practice approaches were flown with an 8,000-ft long runway that was either 75, 150, or 300 ft wide; test approaches were to runways with widths or 75, 100, 150, 200, and 300 ft. In Experiment II, 40 pilots controlled the slant of a moving model runway during simulated night visual approaches. Five different models simulated runways from 100 to 300 ft wide and 3,000 to 9,000 ft long. As predicted, training on a wide runway in Experiment I lowered approach angle in approaches to narrower runways; a narrow practice runway also raised approach angles to wider runways. The magnitude of these practice effects increased as distance from runway threshold decreased. There was also a general tendency for approach angles to decrease as runway width decreased. The latter effect was corroborated in Experiment II; in addition, generated approach angles decreased with increasing runway length. Giving half the pilots information about runway size prior to each approach had no effect on responses. These findings add to the quantitative evidence of danger in night visual approaches due to visual illusions and large variability in the visual perception of approach angle. Language: en