3D Face Scanning for Frame Wearing Parameter Measurement
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Solution Overview
Problem
Current methods for measuring frame wearing parameters, such as back vertex distance and pantoscopic tilts, are time-consuming, imprecise, and uncomfortable for users, as they require manual measurement with specialized tools.
Innovation Solution
A method and device using a 3D image capture device and computing device to scan a user's face, calculate a 3D face model, superpose a 3D glasses reference model, and determine the back vertex distance and pantoscopic tilts automatically, eliminating the need for manual measurement tools.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If manual measurement with specialized tools is used, then measurement can be performed, but the process is time-consuming and not precise
Solution Approach 1:
The patent replaces manual mechanical measurement tools with an automated optical scanning system. The 3D scanning device captures facial geometry and glasses position data, and a computing device automatically calculates frame wearing parameters (back vertex distance, pantoscopic tilt, etc.) through image processing and geometric computation, eliminating the need for manual mechanical measurement.
Solution Approach 2:
The patent creates a 3D digital model (copy) of the user's face and glasses position through scanning. This digital replica allows for precise automated measurement of frame wearing parameters without requiring physical manual measurement tools, thereby improving both precision and efficiency.
2Measurement precision
If manual measurement with specialized tools is used, then measurement can be performed, but users feel uncomfortable during the measure process
Solution Approach 1:
The patent replaces cumbersome manual measurement tools with a non-contact 3D scanning system. The scanning device captures data optically without requiring physical contact or complex tool manipulation by the user, making the process more comfortable and easier to operate while maintaining high measurement precision.
3Reliability
If more data (such as back vertex distance and pantoscopic tilts) are provided for DRP simulation, then the simulation effect and visual effect are better, but the measurement process becomes more complex
Solution Approach 1:
The patent creates a universal 3D scanning and measurement system that simultaneously captures multiple frame wearing parameters (back vertex distance, pantoscopic tilt, face form, etc.) in a single measurement process. This multi-functional approach provides all necessary data for accurate DRP simulation without requiring separate measurement steps for each parameter, thereby improving reliability while managing complexity.
Solution Approach 2:
The patent uses automated optical scanning and computational algorithms to simultaneously measure multiple frame wearing parameters, replacing complex manual measurement procedures. The computing device automatically processes the scanned data to extract all necessary parameters for DRP simulation, simplifying the overall measurement process while providing comprehensive data.
Data Source
AI summary
A measure method and a measure device are provided. The measure method includes: scanning a face of a testee wearing a positioning frame to obtain pupil positions, visual directions, and a 3D face model, the 3D face model wears a positioning frame model corresponding to the positioning frame; superposing a 3D glasses reference model on the positioning frame model of the 3D face model; calculating an inner intersection point of the visual directions and the 3D glasses reference model; and calculating out a back vertex distance according to the pupil positions and the inner intersection point and calculate an angle between a lens plane line of the 3D glasses reference model and a space vertical line to regard as a pantoscopic tilt.