The Images in an immersive head‐mounted display (HMD) for virtual reality provide the sole source for visual adaptation. Thus, significant, near‐instantaneous increases in luminance while viewing an HMD can result in visual discomfort. Therefore, the current study investigated the luminance change necessary to induce this discomfort. Based on the psychophysical experiment data collected from 10 subjects, a prediction model was derived using four complex images and one neutral image, with four to six levels of average scene luminance. Result showed that maximum area luminance has a significant correlation with the discomfort luminance level than average, median, or maximum pixel luminance. According to the prediction model, the discomfort luminance level of a head‐mounted display was represented as a positive linear function in log10 units using the previous adaptation luminance when luminance is calculated as maximum area luminance.
The correlated colour temperature (CCT) is defined by the closest point on the Planckian locus from a light source on the CIE 1960 (u, v) diagram (now obsolete), while the current standard uniform colour space is the CIE 1976 (u', v') diagram. To re-visit the question whether using the (u', v') coordinate improves the correlation between the CCT values and perception, vision experiments were conducted with 12 subjects using a double-booth with non-haploscopic and haploscopic methods. The overall results show that the perception of test lights at CCT 3000 K and Duv-0.015 and 0.015 is closer to the CCT calculated based on CIE 1976 (u', v') coordinate. The perception of CCT at 5500 K with the same Duv shifts appears to be between CCTs based on the (u, v) coordinate and the (u', v') coordinate. It is suggested that the definition of CCT be reexamined for possibly using the CIE 1976 (u', v').
The comfortable luminance of Head Mounted Display (HMD) was investigated under four different surround illuminances. In the psychophysical experiment, participants adapted to the surround illuminance for five minutes and they were asked to answer whether HMD luminance is comfortable or not with the method of constant stimuli. The result demonstrates that the comfortable luminance is increased as the surround illuminance is increased, suggesting the needs of the adaptive luminance control of HMD.
The most preferred monitor gamma value of an OLED transparent display was investigated by simulating the transparent images under the real room lighting condition. It is found that the preferred monitor gamma values tend to decrease as the luminance of black point of the transparent display increases.
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