Camera Motion Control for Eyeglass Face Measurement
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Solution Overview
Problem
Current methods for measuring human faces for eyeglasses lack precision and reliability in capturing pupil distances and frame parameters, and fail to provide a seamless virtual try-on experience, with existing systems either underestimating or overestimating measurements and requiring user assistance or effort.
Innovation Solution
A system comprising a digital camera module, motion control module, and computer module that captures multiple perspective views of a face without requiring the subject to move, allowing for precise measurement of pupillary distance, segment height, vertex distance, and pantoscopic tilt, while also enabling augmented reality and 3D measurements for optimal eyeglass frame fitting.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a digital camera module is used to capture images for measuring pupil distances and frame parameters, then the system becomes more versatile and can provide virtual try-on capabilities, but the measurement precision and reliability deteriorate compared to specialized devices like Essilor PD meter
Solution Approach 1:
The patent combines multiple functions into a single integrated system: the digital camera module captures both pupil distance measurements and frame parameter measurements, while the motion control module enables both precise positioning for measurement and virtual try-on capabilities. This merging allows the system to achieve versatility without sacrificing measurement precision through integrated calibration and coordinate transformation.
Solution Approach 2:
The system changes measurement parameters dynamically based on camera position and orientation. The motion control module adjusts camera parameters (position, angle, distance) to optimize measurement conditions, and the computer module transforms image coordinates to measurement coordinates using calibrated parameters, maintaining precision across different measurement modes.
2Loss of information
If the digital camera module is rotated around the subject's head to capture multiple perspective views, then the system can obtain comprehensive measurements including side views for pantoscopic tilt, but the device complexity increases due to the motion control module
Solution Approach 1:
The motion control module serves multiple functions: it positions the camera for front view capture, rotates the camera for side view capture, and enables virtual try-on by presenting frames from different angles. This multi-functionality reduces the need for separate measurement devices and justifies the added complexity through consolidated capability.
Solution Approach 2:
The system performs self-calibration and self-positioning through the motion control module, which automatically adjusts camera position and orientation based on detected facial features. The computer module automatically transforms coordinates and calculates measurements without requiring manual intervention, reducing operational complexity despite increased device complexity.
3Ease of operation
If the system requires the subject to remain stationary without moving their head, then the ease of operation improves, but the reliability of capturing accurate perspective views may deteriorate if the subject inadvertently moves
Solution Approach 1:
The system uses real-time feedback from the digital camera module to detect subject position and facial features. The computer module continuously monitors image quality and subject stability, and the motion control module adjusts camera position based on feedback to maintain optimal measurement conditions even if the subject moves slightly, ensuring reliability while maintaining ease of operation.
Data Source
AI summary
Methods and systems include using a digital camera module for capturing a plurality of digital images of a tested subject at a plurality of perspective views. The tested subject is not required to move their head position or viewing direction during the capturing of images. A motion control module I) rotates the camera module with its optical axis pointing at a rotation center to correct any orientation error in capturing the perspective views, and II) positions the camera module to adjust the rotation center for accommodating different head positions of the tested subject. A computer module processes and stores the plurality of digital images to fit an eyeglass frame to the tested subject or to acquire data for fitting prescription lenses into the eyeglass frame. The computer module can provide an augmented reality of different styles of eyeglasses, and obtain 3D measurements for fitting eyeglass frames.