Optical Parameter Determination Using Light Projection Marking
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Solution Overview
Problem
Current methods for determining optical parameters, such as pupillary distance and corneal vertex distance, are user-dependent and prone to errors due to manual evaluation, especially in three-dimensional reconstructions, leading to systematic deviations and increased time consumption.
Innovation Solution
A device with a projection device that uses light projection to mark specific points on a user's head and glasses, combined with a digital camera and data processing system, enables automated or semi-automated identification of these points, simplifying the correspondence problem in 3D reconstruction and reducing user dependency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If manual evaluation methods are used to determine optical parameters, then the process is simple and requires minimal equipment, but the measurement precision and reliability deteriorate due to user dependency and systematic deviations
Solution Approach 1:
The patent replaces manual mechanical measurement methods with an automated optical system. A camera captures images of the user's head and glasses, while a projection device displays marked areas to guide automated point identification. This substitution eliminates user dependency and systematic deviations inherent in manual evaluation, significantly improving measurement precision while maintaining reasonable process complexity.
Solution Approach 2:
The patent introduces an intermediary marked area displayed on a screen or projection device. This marked area serves as a visual guide that helps the system automatically identify corresponding points on the user's head and glasses in the captured images. The intermediary element bridges the gap between simple imaging and accurate 3D reconstruction, enabling automated measurement without complex manual intervention.
2Reliability
If automated image processing is implemented to reduce user dependency, then measurement reliability improves, but device complexity and computational requirements increase
Solution Approach 1:
The patent replaces manual point identification with automated image processing algorithms. The system captures images, automatically identifies corresponding points on the user's head and glasses, and performs 3D reconstruction without human intervention. This automation significantly improves measurement reliability and consistency while the computational complexity is managed through efficient algorithm design.
Solution Approach 2:
The marked area displayed through the projection device or screen acts as an intermediary that simplifies the automated identification process. By providing visual guidance on where to look for corresponding points, the intermediary reduces the computational burden of point detection while ensuring high reliability in point identification across different users and conditions.
3Device complexity
If corresponding points are identified manually in stereoscopic images, then the device structure remains simple, but the time consumption and productivity deteriorate
Solution Approach 1:
The patent replaces manual point-by-point evaluation with automated image processing. The system captures stereoscopic images, automatically identifies corresponding points using algorithms, and rapidly computes 3D coordinates and optical parameters. This automation increases productivity by orders of magnitude while the overall system structure remains relatively simple, requiring only a camera, projection device, and processing unit.
Solution Approach 2:
The marked area displayed on the screen or through the projection device serves as an intermediary that guides the automated point identification process. This visual aid enables the system to quickly and accurately locate corresponding points without manual intervention, dramatically increasing the speed of parameter determination while maintaining system simplicity.
4Ease of operation
If light projection is used to mark specific points, then the ease of operation improves by simplifying point identification, but the device complexity increases due to additional components
Solution Approach 1:
The patent introduces a marked area displayed through a projection device or screen as an intermediary element. This marked area is projected onto or displayed near the user's head and glasses, providing clear visual guidance for the system to identify corresponding points. The intermediary simplifies the operation by making point identification intuitive and automatic, while the added complexity of the projection device is justified by the significant improvement in ease of operation and measurement accuracy.
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 solution allows for accurate and efficient determination of optical parameters without physical markings, reducing the risk of incorrect reconstructions and enabling quick calculation of parameters like pupillary distance and corneal vertex distance, facilitating precise lens calculation and centering.
Implementation Method 1
The projection device generates the light projection. The projection device can be designed as a emitter that generates electromagnetic radiation.
Data Source
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AI summary
An apparatus (10) for determining optical parameters of a user (2) with spectacles (4) arranged in the use position on the head of the user (2) comprises at least one projection device (12) designed and arranged for marking a partial region of the head of the user (2) and/or of the spectacles (4) of the user with a light projection; at least one image recording device (11) designed and arranged for generating image data at least from the marked partial region of the head of the user (2) and/or of the spectacles (4) of the user; and a data processing device with a user data determining device, which is designed to determine user data from the marked partial region of the head and/or of the spectacles (4) on the basis of the generated image data, wherein the user data comprise spatial information in the three-dimensional space of points of the partial region of the head and/or of the spectacles (4), and a parameter determining device, which is designed to determine optical parameters of the user (2) on the basis of the user data.