VR Headset IPD Calibration via Marker Overlap Detection
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Solution Overview
Problem
Current VR systems face challenges in accommodating individual interpupillary distances, leading to strabismus risk and discomfort, particularly in children, due to fixed lens configurations that do not adjust for varying user distances, which limits accessibility and safety.
Innovation Solution
A calibration program and method that uses marker images displayed on a VR headset to detect a user's interpupillary distance through head tracking, allowing for software-based adjustment of image positions to match the user's specific IPD, enabling comfortable and safe VR experiences across a range of ages and interpupillary distances.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If fixed lens configuration is used in VR headset, then device complexity is reduced, but adaptability to different interpupillary distances deteriorates
Solution Approach 1:
The patent implements software-based dynamic adjustment of image display positions according to user's interpupillary distance measurements, allowing the VR system to adapt to different users without changing the physical lens configuration. The image positions are recalculated and repositioned based on the measured IPD value, creating a dynamic adaptation solution.
Solution Approach 2:
The system changes the display parameter (image position) based on the measured interpupillary distance. By calculating the appropriate offset from the measured IPD value, the system adjusts the horizontal position of images displayed to each eye, effectively accommodating different interpupillary distances through parameter modification rather than hardware change.
2Device complexity
If fixed image positions are displayed in VR, then device complexity is reduced, but harmful effects on user eyes deteriorate
Solution Approach 1:
The system implements a feedback mechanism where the user's interpupillary distance is measured using the front-facing camera and gyro sensor data. This measured value is then fed back into the image processing algorithm to calculate and apply the appropriate position offset, creating a closed-loop system that adapts to the user's specific anatomy and reduces strabismus risk.
Solution Approach 2:
The system performs preliminary measurement and calibration of the user's interpupillary distance before displaying the main VR content. By measuring the IPD in advance and pre-calculating the image position offsets, the system ensures that the correct positional adjustment is applied from the beginning of the VR experience, preventing harmful effects.
3Measurement precision
If manual calibration for interpupillary distance is implemented, then measurement precision is improved, but ease of operation deteriorates
Solution Approach 1:
The system performs automatic interpupillary distance measurement using the device's existing front-facing camera and gyro sensor. The user simply needs to follow on-screen instructions to position markers, and the system automatically calculates the IPD value through image processing and coordinate transformation algorithms, eliminating the need for manual measurement tools or complex calibration procedures.
Solution Approach 2:
The patent uses marker images displayed on the screen as an intermediary to facilitate the measurement process. These markers serve as reference points that the user can easily track and position, allowing the system to infer interpupillary distance from the user's head movement and marker positioning data, thereby simplifying the interaction while maintaining measurement accuracy.
Data Source
AI summary
An object of the present invention is to obtain calibration data more easily in a VR (Virtual Reality) device. a user wearing a pair of VR goggles visually recognizes overlapped marker images displayed in the 360-degree VR space, and a stationary state is detected when the images for right and left eyes are overlapped, and when the stationary state satisfies a predetermined condition set in advance, one of the plurality of marker images displayed on the display in this state, which is at the center, is set as a marker image for calibration setting, calibration data of the interpupillary distance based on the marker image for calibration setting having been set is acquired, and the acquired calibration data is set as calibration data used for subsequent reproduction of images.