Compact Device for Measuring Morpho-Geometric Parameters of Spectacle Wearers
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Solution Overview
Problem
Existing methods for measuring morpho-geometric parameters of spectacle-wearing individuals are either bulky, inflexible, or require constraining postures, leading to potential errors and inaccuracies in parameter determination.
Innovation Solution
A compact, autonomous computerized device with a screen, target, and high-definition image acquisition system that allows individuals to perform natural head movements while maintaining a constant spectacle position, selecting images where the angular discrepancy between looking at infinity and a target is minimized, thereby eliminating the need for additional correction steps and ensuring precise measurements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a large vertical measuring column with video camera is used, then measurement precision is improved, but device complexity and space requirements increase
Solution Approach 1:
The measurement system is divided into separate functional modules: a first image acquisition system for capturing the face in natural posture, and a second image acquisition system for capturing during head rotation. This segmentation allows each system to be optimized independently and reduces the overall complexity compared to a single large vertical column apparatus.
Solution Approach 2:
A computer acts as an intermediary to process images from both acquisition systems, calculate morpho-geometric parameters, and determine the pantoscopic angle. This intermediary processing approach replaces the need for complex mechanical adjustment mechanisms in the apparatus itself.
2Device complexity
If a compact table-mounted apparatus is used, then device complexity is reduced, but measurement precision deteriorates due to constraining postures
Solution Approach 1:
The system allows dynamic head rotation movements during the measurement process. The second image acquisition system captures images during head rotation, enabling the calculation of pantoscopic angle while maintaining natural head positions. This dynamic approach eliminates the need for constraining postures while preserving measurement precision.
Solution Approach 2:
The system uses feedback from image processing to determine the pantoscopic angle. By analyzing the position of the frame in images captured during head rotation, the system calculates the angle without requiring mechanical constraints or constraining postures, thus maintaining both simplicity and precision.
3Measurement precision
If constraining postures are required for measurement, then measurement precision is improved, but ease of operation deteriorates
Solution Approach 1:
The system captures images during natural head rotation movements rather than requiring static constraining postures. This dynamic capture approach allows individuals to maintain natural head positions while still obtaining precise measurements through image processing during the rotation movement.
Solution Approach 2:
The system automatically processes images and calculates morpho-geometric parameters without requiring manual adjustment or constraining postures. The computer-based image processing and parameter calculation eliminate the need for operator intervention to position the subject, significantly improving ease of operation while maintaining precision.
4Measurement precision
If multiple correction steps are added to account for angular discrepancy, then measurement precision is improved, but device complexity and time consumption increase
Solution Approach 1:
The system continuously captures images during head rotation movement, allowing the calculation of pantoscopic angle to be derived from the rotation data itself rather than requiring separate correction steps. This continuous capture approach integrates the measurement and correction processes, eliminating additional time consumption.
Solution Approach 2:
The system creates a digital copy of the face and frame positions during head rotation, then processes these digital images to calculate the pantoscopic angle. This digital copying and processing approach replaces manual correction steps, reducing time consumption while maintaining precision through automated image analysis.
Data Source
AI summary
The invention relates to a method for measuring the geometric morphometric parameters of a person wearing glasses (21), said method implementing an independent computing device (1, 10) comprising a screen, a target (8, 18), a compact image acquisition system (7, 17) which is provided with a means of determining the inclination thereof, said system (7, 17) being connected to said screen, and a computer for controlling the image acquisition system (7, 17) and processing the images obtained. The main feature of a measuring method according to the invention is that it comprises a step in which the person observes the target (8, 18) placed in a position known to the image acquisition system (7, 17), by rolling his or her head in an upward direction while keeping his or her eyes fixed on the target (8, 18).