Image-Capturing Unit Chromatic Aberration Compensation
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Solution Overview
Problem
In component-mounting devices, magnification chromatic aberration and variations in irradiation surface materials cause inconsistencies in image resolution when subjects are illuminated with light of different wavelengths, leading to inaccuracies in image processing.
Innovation Solution
An image-capturing unit with a light irradiation section that selects light sources of varying wavelengths, a storage section that correlates light color, irradiation surface material, and image resolution, and an image processing section that adjusts image processing based on this correlation to compensate for magnification chromatic aberration and surface material effects.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple light sources with different wavelengths are used to illuminate the subject, then the image resolution varies due to magnification chromatic aberration and irradiation surface material effects, but using a single wavelength limits the ability to handle different material types
Solution Approach 1:
The system performs preliminary calibration by capturing images of a calibration board with known patterns under each wavelength before actual measurement. This preliminary action establishes reference data that compensates for chromatic aberration and material-specific effects, enabling accurate measurements across multiple wavelengths without sacrificing versatility
Solution Approach 2:
The system changes the parameter of wavelength selection based on the irradiation surface material being measured. By selecting appropriate wavelengths and applying corresponding resolution corrections from calibration data, the system maintains measurement precision across different material types while preserving the ability to handle diverse samples
2Measurement precision
If the resolution is adjusted for each combination of light color and material, then accurate image processing is achieved, but the system complexity increases due to multiple calibration parameters
Solution Approach 1:
The calibration board serves multiple functions: it provides reference patterns for all wavelength calibrations, establishes geometric transformations, and validates the imaging system. This universal calibration object reduces the need for separate calibration procedures for each wavelength-material combination, simplifying the overall system despite the multiple parameters involved
Solution Approach 2:
The system creates a digital model (copy) of the calibration board with known geometric properties and uses this model to generate transformation data. This digital copy serves as a reference for all subsequent measurements, eliminating the need for physical recalibration and reducing system complexity while maintaining high 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
This solution enables accurate image processing by accounting for the influence of magnification chromatic aberration and irradiation surface materials, ensuring consistent image resolution across different lighting conditions.
Implementation Method 1
an image captured by imaging the subject may have a different resolution, depending on a material of an irradiation surface irradiated with light
Data Source
AI summary
The image-capturing unit includes an imaging section; a holding section configured to hold a subject to be imaged by the imaging section; a light irradiation section configured to select light of one or more light sources out of multiple light sources having different wavelengths, and to irradiate the subject held in the holding section with the light; a storage section configured to store a correspondence among a color of the light emitted for irradiating the subject by the light irradiation section, a material of an irradiation surface irradiated with the light, and a resolution representing the number of pixels per unit length; and an image processing section configured to obtain the resolution from the correspondence, based on the color of the light emitted for irradiating the subject and the material of the irradiation surface of the subject, and to process a subject image by using the resolution.