Dual-Camera Dimensional Measurement for Template-Free Lens Selection
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Solution Overview
Problem
Conventional methods for obtaining prescription safety eyewear are inconvenient and inefficient, requiring employees to interact with multiple parties for measurement and selection, and traditional single-camera systems necessitate the use of templates that are cumbersome in workplace settings.
Innovation Solution
A dual-camera apparatus and method that uses two spaced digital cameras to derive dimensional measurements of a human subject without the need for templates, combined with a kiosk system for selecting and ordering prescription safety eyewear, allowing employees to conveniently measure and select eyewear at their workplace.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single-camera system is used for measurement, then the device complexity is reduced, but the measurement precision deteriorates due to the need for templates
Solution Approach 1:
The patent transitions from a single-camera 2D measurement system to a dual-camera 3D measurement system. By adding the depth dimension through stereo vision, the system achieves accurate dimensional measurements without requiring physical templates, resolving the contradiction between device complexity and measurement precision.
Solution Approach 2:
The patent introduces a calibration object as an intermediary element during the calibration phase. This calibration object with known dimensions enables the system to establish accurate pixel-to-real-world dimension ratios, allowing template-free measurements while maintaining precision.
2Measurement precision
If templates are used in single-camera measurement systems, then measurement precision is maintained, but the ease of operation deteriorates due to template placement requirements
Solution Approach 1:
The patent extracts and eliminates the template requirement from the measurement process by implementing a dual-camera stereo vision system. The system calculates real-world dimensions directly from stereo images and calibration data, removing the cumbersome template placement step while maintaining measurement accuracy.
Solution Approach 2:
The dual-camera system performs self-calibration and automatic dimension calculation without requiring manual template placement. The system automatically processes stereo images to derive dimensional measurements, making the measurement process more convenient and easier to operate.
3Reliability
If employees obtain prescription eyewear through traditional methods, then the reliability of prescription accuracy is maintained, but the loss of time increases due to multiple interactions with vendors and administrators
Solution Approach 1:
The patent merges the prescription verification process, eyewear selection process, and ordering process into a single integrated kiosk system. Employees can complete all these tasks in one location without separate interactions with administrators and vendors, significantly reducing time loss while maintaining prescription accuracy through automated verification.
Solution Approach 2:
The kiosk system enables employees to independently complete the entire eyewear ordering process including prescription verification, eyewear selection, and ordering without administrative intervention. This self-service approach dramatically reduces the time required while maintaining reliability through automated prescription validation.
4Loss of time
If employees order eyewear from a catalog, then the loss of time is reduced, but the manufacturing precision deteriorates due to fit issues
Solution Approach 1:
The system performs preliminary facial measurement and dimension capture using the dual-camera system before the employee selects eyewear. This preliminary action captures accurate facial geometry data that is used to pre-size and pre-fit eyewear frames, ensuring proper fit while maintaining quick ordering process.
Solution Approach 2:
The system captures multiple facial parameters (face width, face height, ear position, etc.) using the dual-camera system and uses these parameters to automatically size and fit eyewear frames. This parameter-based approach ensures manufacturing precision for proper fit while keeping the ordering process efficient.
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
Enables efficient and convenient fitting of prescription safety eyewear by eliminating the need for templates and streamlining the selection process, ensuring compliance with company standards and reducing administrative burdens for employers.
Implementation Method 1
The lenses are spaced apart at a first known distance. In operation, the first known distance and the established ratio provide a trigonometric basis for ascertaining distances between at least two features on the object.
Data Source
AI summary
A dual-camera apparatus derives dimensional measurements of an object. The apparatus comprises a pair of digital cameras each comprising a lens and capable of producing an image of the object. A ratio of known distance units to pixels is established for the apparatus and applied to images generated by each of the digital cameras. The lenses are spaced apart at a first known distance. In operation, the first known distance and the established ratio provide a trigonometric basis for ascertaining distances between at least two features on the object. A calibration template can be used to establish the ratio of known distance units to pixels. The object can be a human subject, and the at least two features can be associated with the human subject's eyes, the human subject's feet, and/or other human body parts. The disclosure also relates to a method in aiding in lens selection.