Head-Mounted Display Calibration with 3D Coordinate Mapping
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Solution Overview
Problem
The traditional calibration method for transmissive projection head-mounted display devices, such as augmented reality (AR) devices, is cumbersome and time-consuming, making it unsuitable for large-scale mass production.
Innovation Solution
A calibration method that determines the corresponding relationship between the projection coordinate system of the optical engine and the coordinate system of the positioning assembly using 3D point coordinates from a target calibration graphic card image, allowing for simplified data collection and calibration with only one alignment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional calibration method is used, then positioning precision is improved, but calibration time increases and productivity decreases
Solution Approach 1:
The patent applies preliminary action by pre-calculating and storing correspondence relationships between different coordinate systems (lens coordinate system, display coordinate system, and tracking coordinate system) before actual calibration. This allows the calibration process to directly query pre-computed data rather than performing complex real-time calculations, significantly reducing calibration time while maintaining positioning precision.
Solution Approach 2:
The patent uses copying by creating a virtual model of the coordinate system relationships through simulation. A virtual calibration environment is constructed where coordinate transformations are pre-computed and stored as reference data, which is then copied and applied during actual calibration operations, eliminating the need for repeated physical alignment procedures.
2Measurement precision
If traditional calibration method is used, then positioning precision is improved, but calibration process complexity increases
Solution Approach 1:
The patent simplifies the calibration process by pre-computing and storing all necessary coordinate transformation relationships before calibration. Instead of performing complex iterative alignment procedures during calibration, the system directly queries pre-established correspondence data between coordinate systems, dramatically reducing process complexity while maintaining precision.
Solution Approach 2:
The patent replaces the traditional mechanical alignment-based calibration system with a computational approach. Instead of physically moving and aligning components during calibration, the system uses pre-computed digital models and coordinate transformations to establish positioning relationships, substituting mechanical procedures with information processing.
Data Source
AI summary
Disclosed are a calibration method, an apparatus, a device and a system for a head-mounted display device, and a computer-readable storage medium. The calibration method includes: obtaining a three dimensional (3D) point coordinate corresponding to a target calibration graphic card image; the target calibration graphic card image includes an image of a calibration graphic card, and the target calibration graphic card image is an image captured by a positioning assembly in response to that a preset image of the calibration graphic card projected by an optical engine on a see-through display coincides with a real calibration graphic card under a perspective of a wearer of the head-mounted display device; determining a corresponding relationship between a projection coordinate system of the optical engine and a coordinate system of the positioning assembly according to the 3D point coordinate; and calibrating display content of the head-mounted display device according to the corresponding relationship.