Reference Posture Estimation for Vision Correction Lens Centring
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Solution Overview
Problem
Current systems fail to precisely and automatically determine a subject's natural reference posture for corrective lens positioning, leading to potential errors in centring measurements due to manual observation and lack of consideration for psychological and environmental factors.
Innovation Solution
A process and system for estimating a subject's optimal reference posture by measuring real postures during deviations, processing data to produce an optimal posture, and applying conditional probabilities and weights to determine the pantoscopic angle and cap values, incorporating the Frankfurt plane for accurate lens positioning.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If manual observation is used to determine reference posture, then the optician can adjust to individual subjects, but measurement precision deteriorates due to subjectivity and lack of automation
Solution Approach 1:
The patent replaces manual mechanical observation with an automated image analysis system using cameras and computer vision algorithms. The system automatically detects facial features, eye position, and head orientation from captured images, eliminating subjectivity while maintaining the ability to adapt to individual subjects through automated algorithms that can be calibrated for different anatomical variations.
Solution Approach 2:
The system enables self-service posture determination by automatically analyzing the subject's own facial features and head position without requiring manual intervention. The automated detection algorithms process images of the subject's face to independently determine posture parameters, reducing dependency on the optician's manual assessment while maintaining precision.
2Measurement precision
If automated image analysis is used to determine reference posture, then measurement precision improves, but device complexity increases due to multiple sensors and processing systems
Solution Approach 1:
The patent employs a multi-functional image analysis system that simultaneously performs multiple tasks: detecting facial features, determining eye position, calculating head orientation, and identifying reference posture. By consolidating these functions into a single integrated system, the patent reduces overall device complexity compared to having separate specialized devices for each measurement.
Solution Approach 2:
The system introduces an intermediary processing layer that bridges the gap between simple camera capture and complex posture determination. The image analysis software acts as an intermediary that processes raw camera images through standardized algorithms to produce accurate posture measurements, simplifying the overall system architecture while maintaining precision.
3Object-affected harmful factors
If the subject remains in deviated posture during measurements, then environmental factors and psychological influences are minimized, but measurement precision deteriorates due to incorrect reference posture
Solution Approach 1:
The patent implements a feedback mechanism where the system continuously monitors the subject's posture through image analysis and provides real-time guidance to return to the correct reference posture. The system detects deviations from the ideal posture and automatically adjusts its measurements or alerts the optician, ensuring that only accurate reference posture data is used for lens centring while allowing the subject to remain comfortable.
Solution Approach 2:
The system dynamically adapts to the subject's posture variations by continuously analyzing position data and adjusting measurement parameters accordingly. Rather than requiring rigid adherence to a fixed posture, the system dynamically determines the reference posture based on real-time image analysis, allowing the subject to maintain natural positioning while ensuring measurement accuracy through automated adjustment.
Data Source
AI summary
The invention relates to a method for estimating a reference posture of a subject with a view to taking measurements in order to determine the parameters for manufacturing a vision correction device, including, for a plurality of instances in which the head reaches a target reference posture from at least one deviated posture, the steps of: measuring the actual reference posture to thus obtain a plurality of sets of actual reference posture data, and storing said sets of data in a memory; and processing said sets of actual reference posture data using a digital processing unit in order to obtain an optimal reference posture.