Smartphone Lens Shape Measurement via Computer Vision
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Solution Overview
Problem
Current lens shape measurement tools, such as mechanical and video camera-based tracers, are costly, difficult to operate with equipment from different manufacturers, and require frequent calibration and maintenance to ensure accurate measurements.
Innovation Solution
A method using an image recording apparatus, such as a smartphone or tablet, with spatial orientation sensors and computational hardware to capture images of lenses and determine their shape and dimensions using computer vision routines, eliminating the need for specialized and costly equipment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If mechanical tracers are used to measure lens shape, then measurement accuracy is maintained, but device complexity and maintenance requirements increase
Solution Approach 1:
The patent replaces mechanical tracing systems with a digital imaging system consisting of a camera, display screen, and computer vision software. The mechanical probe that physically traces the lens rim is substituted by capturing images of the lens and using algorithmic edge detection to measure lens shape parameters, thereby eliminating mechanical complexity while maintaining measurement capability
Solution Approach 2:
The patent creates a digital copy of the lens by capturing an image of the lens in the frame. Instead of mechanically tracing the physical lens contours, the system creates a digital representation through imaging and uses software algorithms to extract measurement data from this copy, simplifying the physical measurement apparatus
2Measurement precision
If purpose-built tracer devices are used, then measurement capability is provided, but cost and ease of operation worsen
Solution Approach 1:
The patent employs a universal digital imaging device (smartphone or tablet) that can perform multiple functions including lens shape measurement, rather than a dedicated tracer device. The same device used for general photography and computing can capture lens images and run measurement applications, making the system easier to operate and eliminating the need for specialized training on proprietary equipment
Solution Approach 2:
The patent replaces expensive, durable but complex purpose-built tracer devices with affordable, readily available consumer electronics. The use of standard smartphones or tablets that can be easily replaced or updated reduces cost barriers and simplifies operation since these devices are familiar to most users
3Measurement precision
If mechanical tracers are used, then lens shape data is obtained, but calibration and maintenance frequency increases
Solution Approach 1:
The patent eliminates mechanical components that require calibration by using optical imaging and digital processing. The camera-based system captures images that are processed by computer vision algorithms, removing the need for mechanical calibration procedures and reducing maintenance time significantly
Solution Approach 2:
The measurement system performs self-calibration through the use of standard reference features visible in the captured image, such as the lens rim itself or frame features. The computer vision software automatically identifies and measures these features without requiring external calibration equipment or procedures, enabling the system to maintain accuracy without frequent intervention
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
This approach provides accurate and cost-effective lens shape measurement, reducing the need for frequent calibration and enabling easier integration with various production systems, while also simplifying the measurement process.
Implementation Method 1
a camera, display screen, user interface, computational hardware and means for data communication
Data Source
AI summary
A method of measuring lens shape of a spectacle lens, the method comprising: a) providing a spectacle lens on a surface; b) providing an image recording apparatus comprising a camera and a display; c) positioning the image recording apparatus so that the camera is largely parallel to the surface; d) capturing an image of the spectacle lens, the captured image comprising a total surface area of a camera-facing side of the spectacle lens; e) indicating positions of features of the spectacle lens in the captured image; and f) measuring a shape of the spectacle lens and determining image coordinates of the spectacle lens features.