نتایج جستجو برای: luminance meter

تعداد نتایج: 33447  

Journal: :Journal of neurophysiology 2006
Tony Vladusich Marcel P Lucassen Frans W Cornelissen

On the one hand, contrast signals provide information about surface properties, such as reflectance, and patchy illumination conditions, such as shadows. On the other hand, processing of luminance signals may provide information about global light levels, such as the difference between sunny and cloudy days. We devised models of contrast and luminance processing, using principles of logarithmic...

2015
Meng-Jey Youh Chun-Lung Tseng Meng-Han Jhuang Sheng-Cheng Chiu Li-Hu Huang Jyun-An Gong Yuan-Yao Li

A field-emission light source with high luminance, excellent luminance uniformity, and tunable luminance characteristics with a novel lateral-gate structure is demonstrated. The lateral-gate triode structure comprises SiC nanowire emitters on a Ag cathode electrode and a pair of Ag gate electrodes placed laterally on both sides of the cathode. The simple and cost-effective screen printing techn...

Journal: :Perception 2002
Alexander D Logvinenko

Many researchers believe the human visual system classifies luminance edges into those produced by reflectance edges or those produced by illumination edges, yet this classification process is not completely understood. One suggestion is that heuristics are used for edge classification. For example. specific contrast relationships at the luminance edge ('codirectional contrast invariance' and '...

Journal: :Investigative ophthalmology & visual science 2013
Krista R Kelly Sarah R Zohar Brenda L Gallie Jennifer K E Steeves

PURPOSE It is generally accepted that early visual deprivation from monocular enucleation (ME; the surgical removal of one eye) results in intact spatial vision. Yet, motion perception studies in this population yield inconsistent findings. Here, we investigated speed and luminance contrast perception in a group of ME individuals. METHODS Twelve ME participants (mean age = 24 years; mean age ...

2013
Ana Radonjić Alan L. Gilchrist

The coplanar ratio principle proposes that when the luminance range in an image is larger than the canonical reflectance range of 30:1, the lightness of a target surface depends on the luminance ratio between that target and its adjacent coplanar neighbor (Gilchrist, 1980). This conclusion is based on experiments in which changes in the perceived target depth produced large changes in its perce...

Journal: :Journal of vision 2008
Maryam Vaziri-Pashkam Patrick Cavanagh

To investigate the effect of luminance on apparent speed, subjects adjusted the speed of a low-luminance rotating grating (0.31 cd/m(2)) to match that of a high-luminance one (1260 cd/m(2)). Above 4 Hz, subjects overestimated the speed of the low-luminance grating. This overestimation increased as a function of temporal rate and reached 30% around 10 Hz temporal rates. The speed overestimation ...

Journal: :International journal of occupational safety and ergonomics : JOSE 1999
A Wolska M Switula

Luminance distribution in the visual field is considered as one of causal factors with a significant influence on visual fatigue, especially for intensive and extended Video Display Terminal (VDT) work. The aim of the study was to define visual fatigue of VDT operators for different values of surrounding luminance. Experiments were carried out in laboratory conditions under 3 lighting condition...

Journal: :IEICE Transactions 2012
Kunihiko Nagamine Satoshi Tomioka Tohru Tamura Yoshihide Shimpuku

We developed a quantitative evaluation method for luminance and color uniformity on a display screen. In this paper, we report the analysis result of a viewer perception of luminance and color uniformity. In experiments, observers subjectively evaluated Mura images which were showed on the light emitting diode (LED) backlight screen by adjusting the luminance of each LED. We measured the lumina...

Journal: :Academic radiology 2017
Claudio Ferranti Alessandra Primolevo Francesco Cartia Claudia Cavatorta Chiara Maura Ciniselli Manuela Lualdi Silvia Meroni Emanuele Pignoli Maddalena Plebani Claudio Siciliano Paolo Verderio Gianfranco Scaperrotta

RATIONALE AND OBJECTIVES This study evaluates the influence of the calibrated luminance level of medical displays in the detectability of microcalcifications and spiculated lesions in digital breast tomosynthesis images. MATERIALS AND METHODS Four models of medical displays with calibrated maximum and minimum luminance, respectively, ranging from 500 to 1000 cd/m2 and from 0.5 to 1.0 cd/m2, w...

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