Transparent Object Reconstruction via Multi-Wavelength Light Tracing
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current methods for reconstructing transparent objects, such as fringe projection profilometry, face challenges in achieving high accuracy and robustness due to the complexity introduced by refractive and highlight surfaces, which distort rectilinear light into piecewise linear light.
Innovation Solution
A method and system utilizing multi-wavelength light tracing, where a backlight emits lights of different wavelengths, and a camera records position information, allowing for the calculation of three-dimensional coordinates by translating the display screen and applying constraint conditions based on refractive light equations within the transparent object, ensuring high precision and robustness in reconstruction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional fringe projection profilometry is used for transparent object reconstruction, then the system structure is simple, but the measurement precision and reconstruction accuracy are low due to light distortion by refractive surfaces
Solution Approach 1:
The patent divides the light path into three distinct segments: (1) reverse light path from camera pixel to object upper surface, (2) refractive light path through the transparent object, and (3) rectilinear light path from object lower surface to display screen. Each segment has its own mathematical model and constraint conditions, allowing precise reconstruction by solving them sequentially rather than treating the entire path as a single complex problem.
Solution Approach 2:
The patent introduces multi-wavelength light (different frequencies) as an additional dimension to solve the reconstruction problem. By using lights of different wavelengths and establishing corresponding constraint conditions for each wavelength, the system can uniquely determine the three-dimensional coordinates of surface points that would otherwise be ambiguous with single-wavelength methods.
2Measurement precision
If multi-wavelength light tracing with constraint conditions is used, then the reconstruction accuracy is high, but the calculation complexity and device complexity increase
Solution Approach 1:
The patent performs preliminary calibration to obtain intrinsic parameters of the camera and establishes the mathematical models for all three light path segments before actual reconstruction. The constraint conditions for multi-wavelength light are pre-defined based on optical physics principles, allowing the reconstruction algorithm to directly solve for coordinates without iterative optimization, thus reducing real-time calculation complexity.
3Reliability
If multi-view methods or numerical methods are used, then the system structure is simple, but the robustness and precision of reconstruction are not high
Solution Approach 1:
The patent introduces a display screen as an intermediary element between the light source and the transparent object. The display screen presents coded stripe patterns that encode spatial information, which is then modulated by the object's surface geometry and refractive properties. This intermediary provides structured information that enhances robustness against variations in object transparency and surface curvature.
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 precise and robust three-dimensional reconstruction of transparent objects by uniquely determining the coordinates of their surfaces through the multi-wavelength light tracing model and constraint conditions, overcoming the limitations of traditional methods.
Implementation Method 1
a refractive surface and a highlight surface change a rectilinear light into piecewise linear light
Implementation Method 2
emitting, lights of two or more different wavelengths to the display screen by a backlight lighting source
Data Source
AI summary
The present application provides a method and system for reconstructing transparent objects based on multi-wavelength light tracing, the method comprises calculating and obtaining a reverse light equation of one pixel point of a camera by using intrinsic parameters of camera calibration; placing a transparent object on a display screen, emitting, by a backlight lighting source, lights of two or more different wavelengths to the display screen, and recording, by the pixel point, position information of the lights of two or more different wavelengths on the display screen, respectively; translating the display screen along a direction perpendicular thereto, and calculating a rectilinear equation of light from a lower surface of the transparent object to the display screen of the lights of different wavelengths recorded by the pixel point.