Digital Camera Face Measurement System for Eyeglass Frames
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current methods for measuring human faces for eyeglass frame fitting, such as Essilor PD meter and Accufit Digital Measurement systems, either lack precision in measuring pupil distances and frame parameters or fail to provide virtual try-on capabilities, while tablet-based apps are not reliable for precise measurements.
Innovation Solution
A system comprising a first digital camera module for capturing front and side views, a second camera module for top views, and a computer module to process images, eliminating the need for frame attachments by determining pupillary distance, segment height, vertex distance, and pantoscopic tilt without altering the eyeglass frame's appearance or balance, using a mechanical structure with motion control to align cameras and convert pixel coordinates to physical measurements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If Essilor PD meter is used to measure pupil distances, then measurement precision of pupil distances is improved, but the ability to measure other frame parameters and provide virtual try-on is lost
Solution Approach 1:
The patent integrates multiple measurement functions into a single system. The digital camera module can measure pupillary distance with PD-meter-level precision while also measuring segment height, vertex distance, pantoscopic tilt, and other frame parameters. This multi-functional approach eliminates the need for separate devices for different measurements.
Solution Approach 2:
The patent combines the pupillary distance measurement capability with virtual try-on functionality and comprehensive frame parameter measurement into one integrated system. By merging these previously separate functions, the system achieves both high precision measurement and versatility without requiring multiple separate devices.
2Adaptability or versatility
If Accufit Digital Measurement system is used to measure frame parameters, then frame parameter measurement capability is improved, but the ability to match pupil distances with PD meters and provide virtual try-on is lost
Solution Approach 1:
The system performs multiple functions simultaneously: it measures frame parameters like segment height and vertex distance, matches pupillary distances with PD meter precision, and provides virtual try-on capability. This universal approach resolves the contradiction by making the system capable of all these functions in one integrated platform.
3Ease of operation
If tablet-based apps are used for virtual try-on, then ease of operation and cost are improved, but measurement precision and reliability are worsened
Solution Approach 1:
The patent replaces the mechanical/optical measurement system of traditional PD meters with a digital camera-based measurement system. This substitution maintains the precision and reliability of optical measurement while enabling the ease of operation and accessibility of tablet-based virtual try-on applications.
Solution Approach 2:
The system creates a digital copy of the patient's face and frame using photographs captured by the digital camera module. This digital model enables virtual try-on functionality while the same captured images are used for precise measurement extraction, combining the benefits of virtual visualization with accurate measurement capability.
4Measurement precision
If frame attachments are used for measurement, then measurement capability is improved, but the eyeglass frame's appearance and balance are altered
Solution Approach 1:
The patent extracts the measurement marks and attachments from the eyeglass frame itself and places them on a separate reference object or uses natural facial features as reference points. This extraction allows measurements to be taken without modifying the frame's appearance, balance, or comfort.
Solution Approach 2:
The system uses an intermediary reference system - either a separate measurement card with known dimensions or the patient's own facial features - to enable measurements without attaching anything to the eyeglass frame. This intermediary approach maintains the frame's original appearance while still providing the necessary measurement references.
Data Source
AI summary
Methods and systems for making measurements for eyeglass frames worn by human subjects include capturing, using a first digital camera module, a plurality of images of a head of a tested subject wearing an eyeglass frame. The plurality of images comprises a front view image and a side view image of a face of the tested subject. A second camera module is used to monitor a top view of the head. A computer module is used to process the front view image and the side view image. The front view image is used to determine a pupillary distance and a segment height, and the side view image is used to determine a vertex distance and a pantoscopic tilt.