A rotational delay measurement method of an encoder-based VR helmet

Abstract

The invention provides a coder-based VR helmet rotation delay measurement method. A turntable is adopted to drive the VR helmet to rotate; the turntable rotates for a circle to form multiple sector regions, and binary coded values of 1 and 0 are given sequentially to the sector regions; during the movement process of the VR helmet, the self rotation angle is recorded at the division line of each sector region, and when the VR helmet moves again and the VR helmet senses the angle at the division line of the sector region, a corresponding black-and-white image is correspondingly inputted to theVR helmet according to the binary code of the sector region, and the black-and-white image is sensed by a photosensitive sensor; and according to a square wave curve outputted by coding and a square wave curve outputted when the photosensitive sensor senses the black-and-white image, the VR helmet delay time can be acquired. The method enables the black-and-white pattern in the VR helmet and the light code to be subjected to registration, errors caused by manual waveform alignment in early methods do not exist, and the data are expected to be closer to the real delay time.

Description

technical field [0001] The invention belongs to the technical field of virtual reality equipment, and in particular relates to a method for measuring rotation delay of a VR helmet based on an encoder. Background technique [0002] The delay time of the VR helmet is closely related to the user experience, if the delay time is slightly longer, it may cause the user to have "motion sickness" symptoms. The document "Luca M D. New Method to Measure End-to-End Delay of Virtual Reality [M]. MIT Press, 2010." proposes a simple solution for delay measurement, as shown in Figure 1(a), in the VR helmet shell Fix a photosensitive sensor on the screen and the window, and display a gray scale test pattern on the display screen and the VR helmet, and then put the photosensitive sensor on the shell close to the display screen, so that the VR helmet is close to the display screen and along the gray scale. Move back and forth in the direction of degree change, and record the waveforms return...

AI Technical Summary

Problems solved by technology

The disadvantage of this method is that it needs to be moved manually, and the jitter during the movement will introduce a lot of noise to the subsequent signal processing; the method of manually aligning the frequency domain waveform can solve the error caused by the asynchronous pattern between the pattern in the virtual space and the pattern on the display screen. Relying on the naked eye, for such a small time as the delay time, this method sometimes not only cannot eliminate the error, but will introduce new errors; this test method is for the helmet and VR helmet, which needs to be able to calculate itself in the case of so many occlusions position data, which is not friendly to many VR helmet tracking solutions; the obtained data has a large variance, and its instability determines that it cannot be used to make measuring instruments

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