Eyeball Camera for AR VR Display Calibration
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Solution Overview
Problem
Existing VR, AR, and MR technologies face challenges in providing a comfortable and natural-feeling presentation of virtual image elements amidst real-world imagery, due to the complexity of human visual perception.
Innovation Solution
The development of an eyeball camera that mimics human eye geometry, optical performance, and motion, allowing for accurate calibration of AR/VR display systems by simulating human eye gaze and vergence.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional cameras are used for calibration, then device complexity is reduced, but measurement precision deteriorates because they cannot accurately simulate human visual perception
Solution Approach 1:
The patent applies the copying principle by creating an artificial eye that replicates the anatomical and optical characteristics of the human eye. The artificial eye includes a cornea with specific curvature radius (5.5-6.5mm), an iris diaphragm that controls pupil aperture (2-8mm), and a lens system that mimics the human eye's optical properties. This copy allows the calibration system to accurately simulate human visual perception, thereby improving measurement precision while maintaining manageable device complexity through standardized design.
2Measurement precision
If the eyeball camera design with multiple adjustable parameters is implemented, then calibration accuracy improves, but device complexity increases due to multiple controllable components
Solution Approach 1:
The patent applies the dynamics principle by making the artificial eye components adjustable and controllable. The iris diaphragm can dynamically change pupil aperture size, the lens system can adjust focus distance, and the entire artificial eye can be positioned at different locations. These dynamic capabilities allow the system to simulate various human eye states during calibration, improving measurement precision while the controllability actually reduces operational complexity by enabling programmable calibration procedures.
Solution Approach 2:
The patent applies parameter changes by allowing systematic variation of key optical parameters including cornea curvature radius (5.5-6.5mm), pupil aperture diameter (2-8mm), lens focal length, and focus distance (20cm-infinity). These parameter adjustments enable the artificial eye to match different human visual conditions, improving calibration accuracy for various viewing scenarios while providing a structured approach to managing device complexity through parameterized design.
3Ease of operation
If the artificial eye properties are made known and controllable, then calibration process is simplified, but manufacturing precision requirements increase
Solution Approach 1:
The patent applies preliminary action by pre-calibrating and characterizing the artificial eye components during manufacturing. The cornea, iris diaphragm, and lens system are assembled with predetermined geometric parameters and optical properties that are measured and stored before deployment. This preliminary characterization simplifies the operational calibration process, as the system can directly use these pre-determined parameters while the manufacturing precision requirements are concentrated in the production phase rather than affecting operational complexity.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach enables more accurate calibration of AR/VR systems, resulting in a more seamless and natural AR/VR experience by aligning virtual and real-world imagery with human visual perception standards.
Implementation Method 1
The image capture device may include an artificial cornea, an artificial iris diaphragm, an artificial lens, and an image sensor array
Implementation Method 2
The resolution of the eyeball camera is designed to match the acuity of typical 20/20 human vision and focus is adjusted in some implementations from 0 to 4 diopters
Data Source
Figure 1
Figure 2A~2B
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AI summary
Embodiments provide a camera design (e.g., an eyeball camera) that mimics a human eye in geometry, optical performance and/or motion. The eyeball camera adopts the same cornea and pupil geometry from the human eye, and has the iris and pupil configured with multiple texture, color or diameter options. The resolution of the eyeball camera is designed to match the acuity of typical 20/20 human vision, and focus is adjusted from 0 to 4 diopters. A pair of eyeball cameras are mounted independently on two hexapods to simulate the human eye gaze and vergence. The perceived virtual and real world are calibrated and evaluated based on eye conditions like pupil location and gaze using the eyeball cameras. The eyeball camera serves as a bridge to combine the data from spatial computing like eye tracking, 3D geometry of the digital world, display color accuracy/uniformity, and display optical quality (sharpness, contrast, etc.).