When it comes to experience VR glasses are often discussed only the resolution, frame rate and field of view. The virtual measurement center (VDC) Fellbach, Germany measured other important factors such as sharpness, contrast and brightness for 15 glasses VR.
Diagram of measurements were standardized based on the 3D model of the head, including a USB-camera and a lens with high resolution. Artificial head was mounted on a table, virtual reality glasses were positioned so that the camera was aimed at the center of the lens.
Head model with an integrated camera that simulates the human eye. | Image: VDC Fellbach
Professional measuring device that is typically used to monitor calibrationdetermines values such as brightness of black and white, contrast, colour range and colour accuracy. To measure the legibility of the letters used standardized table of check of vision.
In a series of tests skipped measurement with current devices, such as 2 Quest, Valve Index and HP Reverb G2. According to experts, they should be included in future measurements.
The results of the measurements
In the almost thirty of the VDC report lists and analyzes a large number of measurements, which is fully described here. Values in bold indicate the VR glasses with an OLED display.
HTC Vive maximal display brightness measurements. | Circuit: VDC Fellbach
Measurements confirm that OLED displays provide the best level of black. Displays the HTC Vive Pro, Oculus Quest, and Samsung Odyssey in the dark. | Circuit: VDC Fellbach
OLED displays are also a trump card when it comes to colors. “100” means that the VR glasses can display the full color range of the standard (sRGB or AdobeRGB). | Design: VCD Fellbach
Yellow stripe describes the average color deviation. The lower the value, the better. | Circuit: VDC Fellbach
The decisive criterion for measuring the sharpness of the image was the line width to the height of the pixel. | Circuit: VDC Fellbach
Samsung Odyssey and the HTC Vive and HTC Vive Pro offers the best value contrast (white bars). | Circuit: VDC Fellbach
To measure the legibility of the letters was formed by the average (yellow line) legible lines at all measured distances (4-13,84 meters). | Image: VDC Fellbach
Conclusion: image quality VR has a lot of criteria
VDC Fellbach concludes that technical specifications, such as resolution, pixel density display type and subpixel matrix, can provide only limited information about the final image quality VR glasses.
VR devices must also be tested for criteria such as sharpness and contrast of the image, brightness of black and white, colour range, colour accuracy and clarity of writing.
“This is the only way to make the optimum choice depending on the application,” write the testers. As an example, VDC Fellbach calls apps for designing and simulating driving to meet the various requirements of points of virtual reality.
In addition, it should be noted that the lenses also play an important role regardless of the display.
A full report of the workshop can be found on the website VDC Fellbach.
