Color Chart Layout Optimization for Specular Reflection Control
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Solution Overview
Problem
Existing color conversion techniques face challenges in creating highly accurate color conversion parameters when a color patch with angle dependence is used in the color chart, leading to issues with specular reflection and illumination effects.
Innovation Solution
An information processing apparatus that acquires geometrical conditions during image capture and determines the optimal layout position for color patches based on reflected light intensity, laying out color patches with angle dependence at positions with low reflected light intensity to minimize specular reflection and enhance color conversion accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a color patch having angle dependence is included in the color chart to improve color conversion accuracy, then the color conversion accuracy is improved, but the influence of specular reflection becomes great which deteriorates measurement precision
Solution Approach 1:
The patent applies local quality by making different parts of the color chart have different properties. Specifically, color patches having angle dependence are selectively placed only in regions where specular reflection does not occur (diffuse reflection regions), while other regions may contain color patches without this constraint. This localized placement strategy allows the system to benefit from angle-dependent color patches for improved color conversion accuracy in specific areas without suffering from specular reflection issues in other areas.
2Measurement precision
If multiple color patches having angle dependence are laid out to lessen specular reflection influence, then the specular reflection influence is reduced, but illumination light may enter the captured image depending on position which deteriorates measurement precision
Solution Approach 1:
The patent applies preliminary action by pre-determining the geometric conditions of the imaging system (light source position, imaging apparatus position, color chart arrangement) before actual color measurement. Based on these predetermined geometric conditions, the system calculates and identifies regions where specular reflection will not occur, and then places color patches having angle dependence only in those predetermined safe regions. This advance planning prevents illumination light from entering the captured image at problematic angles.
Solution Approach 2:
The patent applies parameter changes by using geometric parameters (positions of light source, imaging apparatus, and color chart) to control the reflection characteristics. By adjusting and optimizing these geometric parameters, the system identifies optimal regions on the color chart where color patches can be placed to avoid both specular reflection and direct illumination light entry into the captured image.
3Measurement precision
If color patches are placed to optimize color conversion, then color conversion accuracy is improved, but the complexity of determining optimal positions increases device complexity
Solution Approach 1:
The patent applies parameter changes by using geometric parameters (positions of light source, imaging apparatus, and color chart) to control the reflection characteristics. By adjusting and optimizing these geometric parameters, the system identifies optimal regions on the color chart where color patches can be placed to avoid both specular reflection and direct illumination light entry into the captured image.
Solution Approach 2:
The patent replaces complex physical trial-and-error methods with computational geometry and optical modeling. Instead of physically arranging color patches and measuring results iteratively, the system uses geometric calculations to predict optimal positions based on the imaging system's parameters, significantly reducing the complexity of the layout determination process.
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 approach allows for the creation of highly accurate color conversion parameters by reducing the influence of specular reflection and ensuring consistent illumination conditions, thereby improving color inspection accuracy.
Implementation Method 1
the influence of specular reflection becomes great
Implementation Method 2
determines a position at which each of a plurality of color patches is laid out in the color chart based on the geometrical condition
Data Source
AI summary
An object of the present disclosure is to provide a technique for creating color conversion parameters for performing highly accurate conversion. One embodiment of the present invention is an information processing apparatus including: an acquisition unit configured to acquire information relating to a geometrical condition in a case where a color chart irradiated with light is captured; and a determination unit configured to determine a position at which each of a plurality of color patches is laid out in the color chart based on the geometrical condition.