MR Headset Camera Calibration With Integrated ET Illumination Target
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Solution Overview
Problem
Existing calibration methods for mixed reality (MR) headsets fail to efficiently and cost-effectively calibrate both external-facing and internal-facing cameras and their illumination systems, which are crucial for accurate positional tracking and interaction features.
Innovation Solution
A system and method utilizing a robotic arm with an end-effector to attach a device, featuring a multifaceted calibration target with an eye-tracking (ET) target and ET illuminator target, allowing simultaneous calibration of cameras, inertial sensors, and illuminators through data collection, preprocessing, and algorithm implementation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If separate calibration methods are used for external-facing cameras, internal-facing cameras, and illumination systems, then each component can be calibrated individually, but the calibration process becomes time-consuming and costly
Solution Approach 1:
The patent combines multiple calibration targets (chessboard pattern for cameras, spherical pattern for illumination) into a single integrated calibration target. This allows simultaneous calibration of external-facing cameras, internal-facing cameras, and illumination systems in one unified process, eliminating the need for separate calibration procedures and significantly reducing calibration time while maintaining accuracy.
Solution Approach 2:
The calibration target is designed to serve multiple functions: it contains patterns for calibrating external-facing cameras, internal-facing cameras, and illumination systems all in one structure. This multi-functional target enables a single calibration procedure to calibrate all components of the MR headset, improving efficiency and reducing costs.
2Adaptability or versatility
If multiple separate calibration procedures are implemented for different camera types and illumination, then comprehensive calibration coverage is achieved, but system complexity and cost increase
Solution Approach 1:
The patent merges multiple calibration functionalities into a single integrated calibration target and one unified calibration procedure. The target incorporates patterns suitable for calibrating both external-facing and internal-facing cameras along with illumination systems, allowing comprehensive calibration coverage without requiring multiple separate procedures or complex equipment setups.
Solution Approach 2:
The calibration target is designed as a universal multi-functional object that can be used for calibrating different types of cameras and illumination systems. This single target replaces the need for multiple specialized calibration targets and procedures, reducing system complexity while maintaining comprehensive calibration coverage across all device components.
3Ease of manufacture
If traditional separate calibration methods are used for camera and illumination systems, then existing calibration infrastructure can be utilized, but cost-effectiveness and efficiency are reduced
Solution Approach 1:
The patent combines calibration procedures for cameras and illumination systems into one simultaneous process using an integrated calibration target. This merging maintains ease of manufacture by using standard imaging equipment already available in MR headsets while dramatically improving calibration efficiency by eliminating sequential processing steps and reducing overall calibration time.
Data Source
AI summary
A system of the subject technology includes a robotic arm including an end-effector configured to rigidly attach to a device, and several camera calibration targets positioned around the robotic arm. The system further includes a multifaceted calibration target consisting of an eye-tracking (ET) target and an ET illuminator target. The robotic arm is operable to rotate the device during a calibration process. The calibration process is a simultaneous calibration of cameras, inertial sensors and illuminators of the device.