Color Inspection System Using Angle-Dependent Reference Regions
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Solution Overview
Problem
Existing color inspection methods do not account for the shape of the inspection object, leading to inaccuracies in color evaluation due to angle-dependent light reflection.
Innovation Solution
An inspection method that acquires a target image of an object's surface and compares the color of a specific attention region with a corresponding reference region, taking into account the combination of incident and reflection angles of light.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional color inspection methods are used without considering object shape, then the inspection process is simple, but the color inspection accuracy deteriorates due to angle-dependent light reflection
Solution Approach 1:
The patent applies preliminary action by pre-acquiring reference images of the inspection object from multiple angles and positions before performing color inspection. The system stores these reference images in advance, allowing the comparison process to account for shape-induced angle dependencies without adding real-time complexity to the inspection workflow
Solution Approach 2:
The patent transitions from two-dimensional color comparison to three-dimensional spatial-aware comparison by incorporating angle and position information. The system compares target image pixels with reference images selected based on their incident and reflection angle characteristics, adding a dimensional aspect to the color inspection process
2Measurement precision
If the inspection method does not consider incident and reflection angles, then the inspection system is simple to operate, but the color comparison accuracy deteriorates due to shape differences
Solution Approach 1:
The system applies self-service by automatically determining the appropriate reference image to compare against based on the incident and reflection angles calculated from the target object's geometry. The inspection system autonomously selects and compares images without requiring manual intervention to account for angular variations
Solution Approach 2:
The patent changes the comparison parameters by incorporating incident angle and reflection angle as key factors in selecting reference images. Instead of simple color value comparison, the system uses angular parameters to determine which reference images are appropriate for comparison, improving accuracy while maintaining operational simplicity
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 improves the accuracy of color inspection by considering the optical characteristics of the object's surface, reducing the influence of shape differences between the object and the reference.
Implementation Method 1
the inspection object may have angle dependency with respect to reflection of light from the illuminator
Data Source
AI summary
Provided are an inspection method, a program, and an inspection system capable of improving accuracy of inspecting a color of a surface of an object. The inspection method includes acquisition step and comparison step. Acquisition step is a step of acquiring a target image of a surface of an object obtained by an imaging system imaging the surface of the object illuminated by an illumination system. Comparison step, is a step of comparing a color of an attention region on the target image with a color of a reference region. The reference region is a region of a reference image of a surface of a reference object as a reference of a color of the object, and a region corresponding to a combination of an incident angle of light from the illumination system and a reflection angle of light to the imaging system in the attention region.