3D Reconstruction of Spectacles Using Blue LED Illumination
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Solution Overview
Problem
Existing 3D reconstruction methods are inadequate for accurately measuring spectacles and spectacle frames due to their thin and partly reflective structures, requiring surface coatings and high-power laser radiation, which are not suitable for commercial 3D scanners.
Innovation Solution
A method and apparatus for generating 3D reconstructions using image data captured from different recording directions with both reflected and background light, allowing for accurate reconstruction of objects with transparent or reflective sections by illuminating the object with illumination light and capturing first and second image data, which are then processed to create a 3D voxel grid and mesh.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If high-power laser radiation is used for 3D reconstruction, then measurement precision is improved, but the complexity of the device increases and surface coatings are required
Solution Approach 1:
The patent replaces expensive, complex high-power laser systems with simpler, commercially available blue LEDs that have sufficient lifespan for the application. This substitution maintains measurement capability while dramatically reducing device complexity and cost.
Solution Approach 2:
The patent changes the illumination parameters by using blue LEDs with specific wavelength characteristics instead of high-power lasers. This parameter change allows achieving comparable measurement precision through different physical means, avoiding the need for surface coatings and complex laser systems.
2Measurement precision
If surface coatings are applied to reflective objects, then measurement precision is improved, but the ease of manufacture decreases
Solution Approach 1:
The patent eliminates the need for surface coatings by using blue LED illumination that can directly capture reflective surfaces. This removes the manufacturing step of applying coatings, significantly improving ease of manufacture while maintaining measurement precision through the specific wavelength properties of blue LEDs.
Solution Approach 2:
The patent extracts and removes the surface coating requirement from the measurement process. By using blue LED illumination, the system can directly measure reflective surfaces without the intermediate step of applying coatings, simplifying the manufacturing process.
3Device complexity
If traditional stereo vision methods are used for transparent objects, then device complexity is reduced, but measurement precision deteriorates
Solution Approach 1:
The patent changes the illumination wavelength parameter by using blue LEDs, which provide optimal contrast for transparent and reflective surfaces. This parameter change enables accurate capture of transparent object features without increasing device complexity, as the solution uses standard camera equipment.
Solution Approach 2:
The patent employs multiple recording directions and dynamic capture of the object from different angles. This dynamic approach allows the system to capture transparent structures that static traditional methods miss, improving measurement precision while maintaining relatively simple device architecture.
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 accurate 3D reconstruction of objects with transparent or reflective sections, including spectacles, by accounting for transparent structures and reducing the need for surface coatings or high-power lasers, resulting in a reliable and precise 3D model.
Implementation Method 1
at least some of which, in relation to an object imaging beam path, is reflected light which illuminates the object
Data Source
AI summary
The generation of a 3D reconstruction of an object is disclosed, which includes illuminating the object, capturing image data in relation to the object, and calculating the 3D reconstruction of the object from the image data. The image data contains first image data and second image data, wherein the first image data are captured when the object is illuminated with illumination light, at least some of which, in relation to an object imaging beam path, is reflected light which illuminates the object, wherein the second image data are captured from different recording directions when the object is illuminated with illumination light, at least some of which is guided in the object imaging beam path, and wherein the 3D reconstruction of the object is calculated from the first image data and the second image data.