منابع مشابه
Vision under mesopic and scotopic illumination
Evidence has accumulated that rod activation under mesopic and scotopic light levels alters visual perception and performance. Here we review the most recent developments in the measurement of rod and cone contributions to mesopic color perception and temporal processing, with a focus on data measured using a four-primary photostimulator method that independently controls rod and cone excitatio...
متن کاملImage detection under low-level illumination
Image detection under low-light-level conditions is treated as a hypothesis-testing problem in which the observations are modeled as a shot-noise process. Since computing the likelihood ratio for shot-noise processes is not feasible, the use of a one-dimensional test statistic obtained by filtering and sampling the observations is proposed. The filter is chosen to maximize a generalized signal-...
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We present a mobile robot localization method using a stereo camera only. Vision-based localization in outdoor environments is still challenging issue because of large illumination changes. To cope with varying illumination conditions, we use 2D occupancy grid maps generated from 3D point clouds obtained by a stereo camera. Furthermore, we incorporate salient line segments extracted from the gr...
متن کاملFrequency-doubling illusion under scotopic illumination and in peripheral vision.
PURPOSE The authors sought to determine whether frequency-doubling illusion (FDI) could be perceived under scotopic illumination at central and peripheral retinal locations. For comparison, perception of the FDI at the central and peripheral retina under photopic illumination was also evaluated. METHODS Five subjects matched the apparent spatial frequency of counterphase flickering sinusoidal...
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We have developed a visual system which adapts for varying illumination. The system has three features. First, the intenaity of the image is kept constant by automatically adjusting the iris value which i s a camera parameter. Semnd, t.lw gray levels of itn image portion or the user's interest are averaged on the assumptiorl illat localized illumination changes uniformly, and the difference bet...
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ژورنال
عنوان ژورنال: Journal of Nippon Medical School
سال: 1950
ISSN: 0048-0444,1884-0108
DOI: 10.1272/jnms1923.17.196