Optical Posture Detection for Accurate Eyeglass Fitting
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Solution Overview
Problem
Current methods for determining geometrical-and-postural parameters for vision-correcting eyeglasses are inaccurate due to the lack of monitoring the wearer's head position during measurement or image capture, leading to errors in pantoscopic angle and eye height measurements when the head is not in the anatomical posture.
Innovation Solution
A method that uses position-identification means on the wearer's head or eyeglass frame to capture images and determine the angle of inclination in the sagittal plane, identifying anatomical planes, and comparing these to predetermined values to accurately calculate geometrical-and-postural parameters, ensuring measurements are taken in the anatomical posture.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If automated image processing is used to determine geometrical-and-postural parameters, then measurement speed is improved, but measurement precision deteriorates due to lack of head posture monitoring
Solution Approach 1:
The system captures multiple images at different head inclination angles and uses feedback from image analysis to determine which image corresponds to the anatomical posture. The angle of inclination is calculated for each image, and the system selects the image where the anatomical plane (containing the pupil and bottom edge of the lens) is horizontal, ensuring accurate parameter determination while maintaining automated processing speed.
Solution Approach 2:
The system performs preliminary capture of multiple images at various head positions before selecting the appropriate one for measurement. By capturing a series of images with different inclinations in advance, the system ensures that the anatomical posture image is available for analysis without requiring manual posture verification during the actual measurement process.
2Measurement precision
If manual measurement methods are used to determine geometrical-and-postural parameters, then measurement precision can be maintained, but productivity deteriorates due to time-consuming processes
Solution Approach 1:
The system replaces manual mechanical measurement methods (using rulers and visual estimation) with automated optical image capture and digital processing. The image-capture device automatically records the position of anatomical landmarks and calculates geometrical-and-postural parameters through software analysis, eliminating the need for manual measurement while maintaining accuracy through automated detection of the anatomical posture.
3Ease of operation
If head inclination is not monitored during image capture, then ease of operation is improved, but measurement precision deteriorates due to posture deviations
Solution Approach 1:
The system performs self-verification of head posture by automatically analyzing the captured images to determine the angle of inclination and identify when the anatomical posture is achieved. The optician simply captures images without manual intervention for posture verification, and the system autonomously selects the appropriate image based on the horizontal orientation of the anatomical plane containing the pupil and lens bottom edge.
Data Source
AI summary
A method includes:a) defining position-identification elements for identifying the position of a first frame of reference associated with a wearer's head in a second frame of reference associated with an image-capture device and for identifying the angle of inclination of the first frame of reference in the sagittal plane of the wearer's head about a center of rotation of the head;b) capturing a series of at least two images of the wearer's head;c) determining, in the second frame of reference, a position of the center of rotation;d) identifying, in each image, the image of a first anatomical point of the wearer's face;e) determining, in each image, the angle of inclination relative to a reference plane of an anatomical plane that is perpendicular to the sagittal plane and that contains the center of rotation and the first anatomical point;f) comparing the angle with a predetermined value; andg) determining the geometrical-and-postural parameter as a function of the comparison.