Virtual 3D Face Model for Precise Spectacle Lens Centering
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Solution Overview
Problem
Current methods for obtaining tailored spectacle lenses require physical visits to opticians, involving cumbersome measuring devices and trained personnel, whereas existing technologies for virtual fitting primarily focus on fashion aspects and augmented reality rather than precise eyewear customization.
Innovation Solution
A computer-implemented method using a mobile terminal device with a depth sensor to create a virtual 3D model of the face, calculate glasses points and viewpoints, and determine centering parameters for lens positioning, allowing for real-time virtual arrangement and fitting of glasses without the need for physical frames or extensive computational resources.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If physical measuring devices and trained personnel are used to center spectacle lenses, then measurement precision is improved, but device complexity and ease of operation deteriorate
Solution Approach 1:
The patent creates a virtual 3D copy of the user's face using depth sensor data and places a virtual model of the spectacle frame onto this digital replica. This virtual copying approach eliminates the need for complex physical measuring devices while maintaining centering precision through automated 3D spatial calculations of lens positions relative to facial landmarks.
Solution Approach 2:
The patent replaces mechanical measuring devices with software-based processing. Instead of using physical tools requiring manual operation, the system uses computer vision algorithms to detect facial features, calculate centering parameters, and determine lens positioning automatically through digital image analysis and 3D coordinate transformations.
2Measurement precision
If physical measuring devices and trained personnel are used to center spectacle lenses, then measurement precision is improved, but ease of operation deteriorates
Solution Approach 1:
The patent enables users to perform their own eye examinations and lens centering at home using a mobile device with a depth sensor. The automated software guides users through the process, automatically detecting facial features and calculating centering parameters without requiring trained optician personnel, thereby improving ease of operation while maintaining precision.
Solution Approach 2:
The patent introduces a software application as an intermediary between the user and the lens centering process. This application acts as a digital assistant that captures depth sensor data, processes facial geometry, determines optimal lens positions, and provides guidance to users, eliminating the need for manual intervention by trained personnel while preserving measurement accuracy.
3Ease of operation
If virtual fitting technologies focus on fashion aspects and augmented reality, then ease of operation is improved, but manufacturing precision deteriorates
Solution Approach 1:
The patent segments the virtual fitting process into distinct functional modules: facial feature detection using depth sensors, 3D model generation of facial geometry, virtual frame placement with adjustable parameters, and automated calculation of centering values. This segmentation allows the system to maintain simplicity for users while incorporating precise measurements required for manufacturing customization.
Solution Approach 2:
The patent utilizes multiple adjustable parameters including depth sensor data, 3D facial model coordinates, frame position, orientation angles, and distance measurements to dynamically calculate optimal lens centering values. By changing and optimizing these parameters based on individual facial geometry, the system achieves both ease of virtual operation and precision required for manufacturing customization.
Data Source
Figure 1a~1b
Figure 1c~2
Figure 3a~3b
AI summary
The invention relates to a computer-implemented method for virtually providing glasses for a person's face, in which the face is detected by at least one sensor of a mobile device, wherein a virtual 3D model of the face is created based on the detected face, wherein, by means of an application implemented and running on the mobile device and in communicative connection with the at least one sensor, mutually assigned glasses points (28a, 28b) of the glasses and face points of the face are automatically calculated based on the 3D model of the face and a provided virtual 3D model of the glasses when the glasses are placed on the face, and the glasses are virtually placed on the face using the mutually assigned and calculated glasses points and face points.