Mobile Terminal Centration Parameter Determination via Acceleration and Image Data
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Solution Overview
Problem
Current methods for determining centration parameters, such as pupillary distance and spectacle frame dimensions, require a measuring brace or multi-camera systems, which are complex and primarily suited for stationary use, limiting their application on mobile terminals like smartphones or tablets.
Innovation Solution
A computer-implemented method using a mobile terminal with a camera and acceleration sensor to capture images at different positions and measure acceleration, allowing for the determination of centration parameters without additional scales or aids, by integrating acceleration data to calculate distances and image angle properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a measuring brace or multi-camera system is used to determine centration parameters, then measurement precision is improved, but device complexity increases and portability deteriorates
Solution Approach 1:
The patent extracts the essential measurement function from complex stationary systems by using only the camera and acceleration sensor already present in mobile terminals. The measuring brace is replaced by software-based image processing that extracts centration parameters directly from photographs of the spectacle frame, eliminating the need for additional physical measuring devices.
Solution Approach 2:
The patent introduces image processing algorithms as an intermediary between the simple camera sensor and the complex task of centration measurement. By processing images through coordinate system transformations and geometric calculations, the system achieves measurement precision comparable to complex devices while maintaining mobile terminal simplicity.
2Measurement precision
If a measuring brace or multi-camera system is used to determine centration parameters, then measurement precision is improved, but ease of operation deteriorates
Solution Approach 1:
The patent enables users to perform centration measurements themselves using their own mobile terminals. The system guides users through simple steps of photographing the spectacle frame, and the embedded algorithms automatically calculate centration parameters without requiring user expertise in measurement techniques or specialized equipment operation.
Solution Approach 2:
The patent replaces mechanical measuring braces and multi-camera systems with software-based image processing. Users simply capture images with a standard camera, and the system performs all measurements computationally, eliminating the need for physical measuring tools and complex device setup.
3Measurement precision
If a stationary multi-camera system is used to determine centration parameters, then measurement precision is improved, but adaptability deteriorates
Solution Approach 1:
The patent makes the mobile terminal camera serve multiple functions: it acts as both the measurement instrument and the processing platform. The same camera used for general photography is also used for precise centration measurements, and the device can adapt to different spectacle frame types and measurement scenarios without requiring specialized equipment.
Solution Approach 2:
The patent transforms the static, stationary measurement system into a dynamic, portable solution. The mobile terminal can be positioned flexibly in various locations and orientations, and the image processing algorithms adapt to different拍摄 angles and conditions, enabling measurements in diverse real-world environments rather than fixed laboratory settings.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Enables simplified and accurate determination of centration parameters on mobile devices, eliminating the need for external scales or trained personnel, and can be used by the individual being examined, facilitating the fitting of spectacle lenses.
Implementation Method 1
capturing a first image of at least one eye area of a person by means of a camera
Implementation Method 2
repeated measurement of an acceleration of the mobile terminal during a movement of the mobile terminal from the first position into the second position
Data Source
AI summary
Methods and devices for determining at least one centring parameter are disclosed. A mobile terminal is moved from a first position to a second position, and a respective image is captured of an eye area of a person. The acceleration is also measured during the movement. The centring parameter is then determined based on the captured image and the measured acceleration.