It is important to be able to engineer the brightness of interior spaces. In addition to the amount of light delivered to and reflected from surfaces in the space, light spectrum influences apparent scene brightness. Specifically, spaces illuminated by ‘cool white’ sources will look brighter than those illuminated by ‘warm white’ sources for the same photopic light levels. A scale model residential space was used to obtain judgements of scene brightness where light levels, surface reflectances and light source correlated colour temperatures were parametrically varied. Subjective and radiometric data were used to extend a provisional model of scene brightness, which is intended to be useful for predicting scene brightness of interior spaces illuminated to different levels by ‘white’ light sources of different correlated colour temperatures.

The conventional display measurements are no longer satisfying the need for eyewear displays. The measurement of VR/AR type display requires light measuring devices (LMDs) to simulate the characteristics of the human eye. Factors like the position of the pupil, field of view, and the motion of the eye are often discussed. One of the factors to be considered is the choice of entrance pupil location (aperture stop setting) of the LMD. In this paper, a preliminary study was carried out to compare the deviations of FOV and luminance with the choice of entrance pupil location. The experiment demonstrated that it exists as the most accurate eye‐viewing when the entrance pupil is located at the front focal point.

The measurement of optical performance such as luminance, chromaticity for augmented reality/virtual reality (AR/VR) display is significantly different from that of conventional real display. The spatial coordinates of the virtual image need to be described with a V-H angular coordinate system. The image beam to be measured at each viewing field comes through exit pupil of the virtual imaging device, which is difficult for the measurement of the virtual image by traditional luminance meters. In this paper, we proposed a new optical measurement system which simulates the imaging mechanism of the human eye. A 5mm aperture is placed in front of the focal point of the imaging lens of the luminance meter, which works as the entrance pupil of the luminance meter and is fit to inside of the exit pupil of the virtual imaging device, and the field of view (FOV) keep constant at different imaging distances. The combination of a spectrometer and a CCD imaging device is equipped to determine the optical and image parameters of AR/VR displays.

Augmented Reality (AR) has become a hot topic. It seems AR is finally becoming ready for the generals: Public securities have been using AR glasses to assist their public patrol activities, the museum offers the AR glasses to enhance the visitor experience, the oil evaporation workers wear AR headset to help their evaporation operation, etc. However, the one component that is probably most limiting today's popularization is the display's image quality. This paper addressed the image quality of see‐through real scene for AR glasses. Michelson contrast or namely luminance modulation, is measured to evaluate the quality of an see‐through optics. In this paper, we studied the Michelson contrast at different locations of the optics of AR displays. Two types of AR displays were selected for the evaluation and measurement. This paper discussed the two favorable AR type technologies: waveguide and combiner (prism‐combiner).

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