Virtual Image Display Calibration via Hand-Held Optical Feedback
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Solution Overview
Problem
Conventional virtual reality systems experience accuracy issues in the pointing direction of control cursors due to errors in movement data sensed by inertia measurement units, leading to poor user experience over time.
Innovation Solution
A virtual image display system and calibration method where a hand-held control device captures and analyzes image information from a virtual image display device to obtain relative angle information, allowing the system to adjust the pointing direction of a displayed virtual control device, thereby maintaining the accuracy of manipulation actions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a built-in inertia measurement unit is used to sense movement data and calculate control cursor position through an algorithm, then the system can determine the direction of the control cursor in the virtual image, but accumulated errors occur over long-term operation leading to huge positioning inaccuracies
Solution Approach 1:
The system captures images of the virtual image display device using the hand-held control device's imaging unit, calculates actual relative angle information from these images, and uses this feedback to correct the virtual control device's pointing direction. This closed-loop feedback mechanism continuously eliminates accumulated errors from the inertia measurement unit, maintaining high positioning accuracy over long-term operation.
Solution Approach 2:
The patent replaces reliance on the mechanical inertia measurement unit alone with an optical-based calibration system. By using the imaging unit to capture images and calculate relative angle information optically, the system substitutes the error-prone mechanical sensing with a more accurate optical measurement method for calibration purposes.
2Measurement precision
If the hand-held control device captures and analyzes image information to obtain relative angle information, then the pointing direction accuracy is improved, but the device complexity increases
Solution Approach 1:
The hand-held control device performs multiple functions: it serves as both the control input device and the calibration device. The imaging unit, originally designed for other purposes, is utilized to capture images of the virtual image display device for calibration. This multi-functionality eliminates the need for separate calibration equipment, reducing overall system complexity while maintaining high pointing direction accuracy.
Data Source
AI summary
A virtual image display system includes a virtual image display device and a hand-held control device. The virtual image display device is coupled to the hand-held control device. The hand-held control device is configured to capture image information of the virtual image display device and analyze the image information to obtain relative angle information between the virtual image display device and the hand-held control device. The virtual image display device adjusts a pointing direction of a displayed virtual hand-held control device image according to the relative angle information.