Radiant Vision Systems' near-eye display assessment tool
Radiant Vision Systems' new AR/VR lens for its ProMetric imaging photometers and colorimeters is used for measuring the visual quality of near-eye displays (NEDs) inside virtual (VR), mixed (MR), and augmented reality (AR) headsets. The lens design simulates the size, position, and field of view of the human eye, featuring an aperture at the front of the lens to position the imaging system’s entrance pupil within NED headsets at the same location as the human eye.
“In order to correctly assess the quality of near-eye displays as viewed by a human observer, the measurement system should replicate the ability of the human eye to receive immersive visual input, and at a similar distance from the display,” said Doug Kreysar, Chief Solutions Officer at Radiant Vision Systems. “The challenge is that existing photometric measurement devices have been designed to evaluate more traditional displays like televisions and smartphones. In these systems, standard optical components position the aperture deep within the lens enclosure, limiting the camera’s ability to capture the full angular field of view of the display without occlusion by NED headset hardware. The Radiant Vision Systems AR/VR lens, by comparison, features aperture characteristics that replicate the human eye in NED headsets, including an entrance pupil positioned directly at the headset eye lens. In addition, we are able to measure a large 120-degree field of view, suitable to measure advanced VR devices.”
By mounting the AR/VR lens directly to a ProMetric imaging photometer or colorimeter, Radiant Vision Systems now offers a solution for in-headset near-eye microdisplay measurement, including display technology-based LED, LCD, OLED, and projection. Radiant TrueTest Software is the test suite for display measurement, as well as specialized tests required in AR/VR testing, and can sequence tests for rapid evaluation of all relevant display characteristics in seconds, applying selected tests to a single image captured by the camera. Standard tests in TrueTest include luminance, chromaticity, contrast, uniformity, mura (blemishes), and pixel and line defects. Unique tests for AR/VR display analysis include slant edge contrast (for MTF measurement based on ISO 12233), image distortion (for distortion characterization), image retention/sticking, and X,Y position reported in degrees.
The AR/VR lens is an optional mounting accessory for Radiant’s 16- or 29-megapixel CCD-based ProMetric Y Imaging Photometer or ProMetric I Imaging Colorimeter. By mounting a lens directly to a ProMetric imaging photometer or colorimeter, the AR/VR lens offers the most efficient means of measuring NEDs as a turnkey, compact camera/lens solution that requires minimal setup and integration time, equipment, or expertise. The AR/VR lens can easily be removed and replaced with standard lenses for additional display measurement applications, such as testing displays outside of headset equipment or on the production line.