Portable Image Capture Device for Eyeglass Fitting
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Solution Overview
Problem
The existing methods for measuring geometrical-physiognomic parameters for corrective eyeglasses are cumbersome, expensive, and prone to inaccuracies due to vertical parallax errors, making them inefficient for precise measurements in a sales environment.
Innovation Solution
A portable, compact image capture device is used, with a visual assistance device such as a luminous object mounted as a pendulum to ensure the line of sight is horizontal, eliminating vertical parallax errors and allowing for accurate measurements of pupil height and pantoscopic angle.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a portable image capture device is used for measuring geometrical-physiognomic parameters, then the device complexity and cost are reduced, but measurement precision deteriorates due to vertical parallax errors
Solution Approach 1:
A visual assistance device comprising a luminous object mounted as a pendulum is introduced as an intermediary element. This device provides a reference that enables the operator to manually position the portable image capture device at the correct altitude, eliminating vertical parallax errors and ensuring accurate pupil height measurements while maintaining the simplicity and portability of the measurement system
Solution Approach 2:
The pendulum-mounted luminous object serves as a self-aligning reference system. The pendulum naturally aligns with gravity, providing an automatic vertical reference that guides the operator in positioning the image capture device without requiring complex electronic sensors or automated positioning systems
2Adaptability or versatility
If manual positioning of the image capture device is used, then the measurement process becomes more flexible and portable, but measurement time increases due to operator adjustment requirements
Solution Approach 1:
The visual assistance device with the pendulum-mounted luminous object is prepared in advance and attached to the image capture device before the measurement begins. This preliminary setup provides immediate visual guidance during the measurement process, reducing the time required for operator adjustment and positioning while maintaining measurement flexibility
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
The method provides rapid, flexible, and precise measurements of geometrical-physiognomic parameters, ensuring the corrective lenses are accurately positioned for optimal optical function, improving the efficiency and accuracy of the measurement process.
Implementation Method 1
a visual assistance device comprising at least one luminous object mounted as a pendulum
Data Source
Figure 1~2
Figure 3~5
AI summary
The method comprises at least one taking of a digital image of th face of the wearer by means of a portable image capture device (1) and a processing of said captured image to determine a geometrical/physiognomical parameter. The operator manually positions the image capture device prior to taking the image, in a first configuration in which a straight line of observation, connecting the diaphragm (7) of the image capture device and a given prominent point on the face of the wearer or on the frame is essentially horizontal. Taking the image is carried out in a second configuration of the image capture device such that the height of said image capture device is the same as in the first configuration. Calculation of the geometrical/physiognomical parameter comprises an identification on said image of the image of the given prominent point.