Texture Evaluation Apparatus Using Projected Pattern Shape Change
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Solution Overview
Problem
Existing texture evaluation methods for coated plates and similar objects rely heavily on visual judgment, which is subjective and prone to variations due to individual differences and environmental factors, and existing techniques that use image clarity meters fail to accurately capture human sensory perception.
Innovation Solution
A texture evaluation apparatus comprising a projector to project a two-dimensional pattern with edge elements onto an object, an imager to capture the image, and an evaluator to calculate the shape change of the virtual image, using sensory evaluation information to assess the texture based on the shape change, thereby aligning with human perception.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If visual judgment by a judge is used to evaluate texture, then human sensory perception can be captured, but judgment results vary depending on physical condition and individual difference of the judge
Solution Approach 1:
The invention uses an imager to capture a reflected image of a two-dimensional pattern on the object surface, creating a digital copy of the surface texture. This digital copy can be analyzed objectively without human variation, resolving the contradiction between capturing human sensory perception and ensuring evaluation consistency.
Solution Approach 2:
The invention replaces the mechanical/subjective visual judgment system with an optical imaging system and automated analysis. The projector-imager-evaluator system substitutes human judges, eliminating individual differences and physical condition variations while maintaining texture evaluation capability.
2Reliability
If image clarity meter is used to evaluate texture, then objective measurement is achieved, but the evaluation cannot adapt to human sensory perception
Solution Approach 1:
The invention changes the evaluation parameter from simple image clarity metrics to shape change amount of a virtual image. By projecting a known two-dimensional pattern and measuring its shape distortion upon reflection, the system achieves both objective measurement consistency and alignment with human sensory perception of surface texture.
Solution Approach 2:
The invention transitions from evaluating intrinsic image properties to evaluating the transformation of a projected pattern. By measuring how the projected two-dimensional pattern's shape changes when reflected from the surface, the system captures texture information that aligns with human perception while maintaining objective measurement.
3Measurement precision
If standard deviation of reference mirror surface is used as baseline, then quantitative evaluation is possible, but flexible evaluation adapted to human sensory perception cannot be achieved
Solution Approach 1:
The invention performs preliminary action by projecting a standardized two-dimensional pattern onto the object surface before evaluation. This pre-projection of a known geometric pattern enables subsequent measurement of shape changes that directly correlate with human sensory perception of texture, providing both quantitative capability and adaptability.
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
The solution enables a more accurate and consistent texture evaluation that closely mimics human sensory perception, reducing fluctuations from individual and environmental factors, with a high correlation between calculated evaluation quantities and subjective scores.
Implementation Method 1
a projector configured to project a two-dimensional pattern having an edge element onto an object
Implementation Method 2
an imager configured to capture an image of a surface of the object
Data Source
AI summary
A texture evaluation apparatus includes a projector, an imager, and an evaluator. The projector is configured to project a two-dimensional pattern having an edge element onto an object. The imager is configured to capture an image of a surface of the object. The evaluator is configured to calculate an amount of shape change of a virtual image of the two-dimensional pattern in the image, and evaluate texture of the object based on the amount of shape change and sensory evaluation information obtained in advance.