Shape Reconstruction Using Segmented Solid-Angle Illumination
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Solution Overview
Problem
Conventional image measurement devices using telecentric imaging optical systems struggle to reconstruct three-dimensional shape information of measurement objects due to limitations in detecting height direction data, despite being effective for two-dimensional surface measurements.
Innovation Solution
A shape reconstruction method and device that apply illumination light with specific irradiation solid angles, capturing images with different optical attributes, and processing these to obtain normal vectors for each pixel, allowing reconstruction of three-dimensional shape information by analyzing the inclusion relations between solid angle regions and observation angles.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a telecentric imaging optical system is used, then two-dimensional surface measurement is improved with less blurring, but three-dimensional shape measurement capability deteriorates due to inability to detect height direction information
Solution Approach 1:
The illumination solid angle is segmented into multiple solid angle regions with different optical attributes (e.g., different wavelengths or polarization states). By segmenting the illumination into distinct regions, the system can selectively activate different regions to extract different surface properties, enabling both 2D precision and 3D shape reconstruction from a single image.
Solution Approach 2:
The patent introduces a new dimension of analysis by considering the optical attributes (wavelength, polarization) as additional dimensions beyond the traditional spatial coordinates. This allows the system to extract height direction information by analyzing how different solid angle regions interact with the surface, transforming a 2D image into a source of 3D shape data.
2Device complexity
If conventional illumination is used, then simple imaging is maintained, but inclination information for each point cannot be obtained
Solution Approach 1:
Different solid angle regions are assigned different optical attributes tailored to specific measurement purposes. Each region can be optimized for detecting particular surface properties, allowing the system to obtain detailed inclination information at each point by analyzing the response to locally optimized illumination conditions.
Solution Approach 2:
The patent changes the parameters of the illumination light by introducing multiple solid angle regions with different optical attributes (wavelength, polarization state). By varying these parameters across different illumination regions, the system extracts additional information about surface inclination that would otherwise be lost in conventional single-parameter illumination.
3Productivity
If single imaging is used, then measurement speed is improved, but detailed three-dimensional shape information is lost
Solution Approach 1:
The illumination device is designed with multi-functionality, where a single imaging system can simultaneously extract multiple types of information (2D surface geometry, 3D shape, inclination angles) by utilizing different solid angle regions with different optical attributes. This universal approach eliminates the need for multiple separate measurements while maintaining high measurement speed.
Solution Approach 2:
The patent introduces optical attributes (wavelength, polarization) as intermediary parameters that mediate between the illumination light and the surface properties being measured. These intermediaries carry additional information about surface inclination and 3D shape while passing through the same imaging system, allowing detailed 3D reconstruction without sacrificing measurement speed.
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 quick and accurate reconstruction of shape information for each point of a measurement object, overcoming the limitations of telecentric imaging systems by uniformly applying illumination and using optical attributes to determine normal vectors, thereby facilitating precise three-dimensional shape measurement.
Implementation Method 1
applying, to the measurement object, the illumination light having a specific irradiation solid angle including a plurality of solid angle regions with optical attributes, each different from each other; receiving object light, generated by the illumination light, from the measurement object at a predetermined observation solid angle and capturing the image
Data Source
AI summary
An illumination device has a light source unit, a lens unit, and a filter unit An imaging device receives object light, generated by the illumination light, from the measurement object at a predetermined observation solid angle, and pixels of the imaging device can each identify the different light wavelength ranges. A processing device includes an arithmetic unit configured to obtain a normal vector at each point of the measurement object corresponding to each pixel from inclusion relation between the plurality of solid angle regions, constituting the object light, and the predetermined observation solid angle, and a shape reconstruction unit configured to reconstruct the shape of the measurement object.