scholarly journals CHROMATIC ADAPTATION EFFECTS AND LIMITS OF AMBIENT ILLUMINATION SPECTRAL CONTENT

2019 ◽  
Author(s):  
Balazs Vince Nagy ◽  
Agnes Urbin ◽  
Mark Dominek ◽  
Akos Nyitrai ◽  
Laszlo Sipos
Keyword(s):  
Chromatic Adaptation ◽  
Ambient Illumination ◽  
Spectral Content ◽  
Adaptation Effects

Very-long-term chromatic adaptation: Test of gain theory and a new method

2008 ◽  
Vol 25 (3) ◽  
pp. 411-414 ◽  
Author(s):  
SUZANNE C. BELMORE ◽  
STEVEN K. SHEVELL
Keyword(s):  
New Method ◽  
Chromatic Adaptation ◽  
Adaptation Period ◽  
Ambient Illumination ◽  
Long Wavelength ◽  
Room Illumination ◽  
Light Levels ◽  
Test Light ◽  
Adaptation Test

This research had two goals. First, a new method of very-long-term chromatic adaptation was compared to an older method of long-wavelength ambient illumination. In the new method, the observer viewed for 1 h per day for 12 or 14 days a CRT screen composed of oriented lines that appeared red. One observer also replicated a previous procedure (Neitz et al., 2002) in which she was exposed to long-wavelength room illumination for 4 h per day for 14 days. For both methods, equilibrium yellow was measured each day about 20 h after the end of the adaptation period. Both methods of very-long-term chromatic adaptation gave similar results. Second, shifts in equilibrium yellow were measured over a 30:1 range of light levels to determine if changes in color percepts were explained solely by a gain change in cone sensitivities (von Kries coefficient law). The magnitude of shift of equilibrium yellow depended on the level of the test light, which was not consistent with a gain theory of very-long-term chromatic adaptation.

scholarly journals The persistent influence of viewing environment illumination color on displayed image appearance

2020 ◽  
Vol 2020 (1) ◽  
pp. 39-43
Author(s):  
Trevor Canham ◽  
Marcelo Bertalmío
Keyword(s):  
Additional Data ◽  
Previous Experiment ◽  
Chromatic Adaptation ◽  
Data Sets ◽  
Color Management ◽  
Viewing Angle ◽  
Ambient Illumination ◽  
Significant Difference ◽  
Image Appearance ◽  
White Point

Chromatic adaptation considering competing influences from emissive displays and ambient illumination is a little studied topic in the context of color management in proportion to its influence on displayed image appearance. An experiment was conducted to identify the degree to which observers adapt to the white point of natural images on an emissive display versus the color of ambient illumination in the room. The responses of observers had no significant difference from those of a previous experiment which was conducted with roughly the same procedure and conditions on a mobile display with a significantly smaller viewing angle. A model is proposed to predict the degree of adaptation values reported by observers. This model has a form such that it can be re-optimized to fit additional data sets for different viewing scenarios and can be used in conjunction with a number of chromatic adaptation transforms.

Hearing in Mice by GSR Audiometry: II. Magnitude of Unconditioned GSR as a Function of Intensity and Frequency Interactions

1968 ◽  
Vol 11 (1) ◽  
pp. 169-178 ◽  
Author(s):  
Alan Gill ◽  
Charles I. Berlin
Keyword(s):  
Power Law ◽  
Response Magnitude ◽  
Single Units ◽  
Spectral Content ◽  
Hearing Sensitivity ◽  
Subjective Magnitude ◽  
Orderly Fashion ◽  
Viiith Nerve

The unconditioned GSR’s elicited by tones of 60, 70, 80, and 90 dB SPL were largest in the mouse in the ranges around 10,000 Hz. The growth of response magnitude with intensity followed a power law (10 .17 to 10 .22 , depending upon frequency) and suggested that the unconditioned GSR magnitude assessed overall subjective magnitude of tones to the mouse in an orderly fashion. It is suggested that hearing sensitivity as assessed by these means may be closely related to the spectral content of the mouse’s vocalization as well as to the number of critically sensitive single units in the mouse’s VIIIth nerve.

Adaptive Ambient Illumination Based on Color Harmony Model

2009 ◽  
Vol E92-A (12) ◽  
pp. 3372-3375
Author(s):  
Ayano KIKUCHI ◽  
Keita HIRAI ◽  
Toshiya NAKAGUCHI ◽  
Norimichi TSUMURA ◽  
Yoichi MIYAKE
Keyword(s):  
Ambient Illumination ◽  
Color Harmony

Investigating Chromatic Adaptation via Memory Colour Matching Method on a Display

2018 ◽  
Vol 2018 (1) ◽  
pp. 313-317
Author(s):  
Yuechen Zhu ◽  
Qiyan Zhal ◽  
Ming Ronnier Luo
Keyword(s):  
Chromatic Adaptation ◽  
Matching Method

Real-world environment affects the color appearance of virtual stimuli produced by augmented reality

2019 ◽  
Vol 2019 (1) ◽  
pp. 237-242
Author(s):  
Siyuan Chen ◽  
Minchen Wei
Keyword(s):  
Augmented Reality ◽  
Real World ◽  
Mixed Reality ◽  
Rapid Development ◽  
Light Level ◽  
Color Appearance ◽  
Chromatic Adaptation ◽  
Lighting Condition ◽  
The Real ◽  
World Environment

Color appearance models have been extensively studied for characterizing and predicting the perceived color appearance of physical color stimuli under different viewing conditions. These stimuli are either surface colors reflecting illumination or self-luminous emitting radiations. With the rapid development of augmented reality (AR) and mixed reality (MR), it is critically important to understand how the color appearance of the objects that are produced by AR and MR are perceived, especially when these objects are overlaid on the real world. In this study, nine lighting conditions, with different correlated color temperature (CCT) levels and light levels, were created in a real-world environment. Under each lighting condition, human observers adjusted the color appearance of a virtual stimulus, which was overlaid on a real-world luminous environment, until it appeared the whitest. It was found that the CCT and light level of the real-world environment significantly affected the color appearance of the white stimulus, especially when the light level was high. Moreover, a lower degree of chromatic adaptation was found for viewing the virtual stimulus that was overlaid on the real world.

Prediction of Incomplete Chromatic Adaptation Under Illuminant A from Images

2014 ◽  
Vol 58 (3) ◽  
pp. 304031-304039
Author(s):  
Shoji Tominaga ◽  
Takahiko Horiuchi ◽  
Shiori Nakajima ◽  
Mariko Yano
Keyword(s):  
Chromatic Adaptation
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