3D Spectacle Frame Adjustment for Accurate Lens-Pupil Alignment
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Solution Overview
Problem
Existing methods for adjusting spectacle frames to fit individual users accurately are prone to inaccuracies, leading to suboptimal lens positioning and visual correction due to issues like human error, facial asymmetries, and image distortions, which affect optical performance, field of view, alignment, and comfort.
Innovation Solution
A computer-implemented method using 3D scanning and machine learning to identify facial landmarks, apply fit rules, and adjust frame measurements based on precise facial and frame data to ensure optimal lens positioning relative to the user's pupils, incorporating multiple neural networks for enhanced accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If manual measurement methods (ruler, pen, electronic tool) are used to take facial measurements, then the measuring process can be completed, but measurement precision deteriorates due to human error, facial asymmetries, and positioning inaccuracies
Solution Approach 1:
The patent replaces manual mechanical measurement tools (rulers, pens, electronic measuring tools) with a digital image processing system that uses photographs and automated landmark detection algorithms. This substitution eliminates human error in marking and measuring, providing consistent and accurate facial measurements through computer vision technology.
Solution Approach 2:
The patent creates a digital copy of the facial measurements by detecting landmark locations from photographs. Instead of physical measurements, the system generates coordinate data representing key facial points, which can be precisely processed and used to determine optimal frame positioning without the errors inherent in physical measurement methods.
2Ease of operation
If trial and error method is used for frame adjustment, then frame selection can be made, but optical performance deteriorates due to incorrect lens positioning and alignment
Solution Approach 1:
The patent performs preliminary calculations of lens positioning and frame adjustment before the actual frame fitting. By using detected facial landmarks to pre-determine the optimal position of the optical center and frame orientation, the system eliminates the need for trial and error adjustments, ensuring accurate lens positioning from the start.
Solution Approach 2:
The system enables self-service frame adjustment by providing automated guidance based on facial measurements. The calculated positioning parameters allow the frame to be correctly positioned without requiring multiple trial fittings or expert intervention, improving both ease of operation and positioning accuracy.
3Ease of manufacture
If frame measurements are not accurately adjusted to facial measurements, then frame assembly can be completed, but optical performance deteriorates due to incorrect optical center positioning and lens tilt
Solution Approach 1:
The patent uses feedback from detected facial landmark positions to adjust frame measurements. The system compares the actual facial geometry with the frame specifications and calculates the necessary adjustments to ensure the optical center aligns with the pupil and the lens tilt is correct, providing accurate optical positioning.
Solution Approach 2:
The patent changes key parameters including the position of the optical center, lens tilt angle, and frame orientation based on the detected facial landmarks. By adjusting these parameters according to the measured facial geometry, the system ensures proper optical alignment while maintaining ease of frame assembly.
4Productivity
If standard frame measurements are used without customization, then frame production can be simplified, but visual correction deteriorates due to suboptimal lens positioning relative to pupils
Solution Approach 1:
The patent performs preliminary calculations of customized frame measurements based on facial landmarks before frame production. This allows standard frames to be quickly adapted with precise customization parameters, maintaining production efficiency while achieving optimal lens-pupil alignment for each individual user.
Solution Approach 2:
The patent applies local quality customization by adjusting specific parameters (optical center position, lens tilt, frame orientation) based on individual facial characteristics. Instead of completely customizing the entire frame, the system modifies only the necessary local parameters to achieve precise lens positioning while keeping the overall frame production process efficient.
Data Source
AI summary
A computer-implemented method of adjusting a spectacle frame for a user to provide a customised spectacle frame, comprising the steps of receiving input data comprising three-dimensional coordinate data representing a user's head; identifying a plurality of landmark locations within the input data, wherein a landmarks location corresponds to a three-dimensional position of a facial feature; determining a set of facial measurements based on the plurality of landmark locations by calculating at least one measurement associated with at least one landmark location; retrieving a set of frame measurements representing a base spectacle frame from a database of frame measurements; comparing the set of facial measurements with the set of frame measurements; adjusting at least one frame measurement in the set of frame measurements based on the comparison; outputting a data file comprising a set of adjusted frame measurements; wherein the set of frame measurements comprises a lens height measurement and the adjusting comprises adjusting the lens height measurement from an initial value to an adjusted value.