Optical Profile Correction for 3D Surface State Evaluation
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Solution Overview
Problem
Existing image processing techniques fail to accurately evaluate the surface state of non-planar objects, as they assume a planar surface and cannot account for variations in surface angles relative to the imaging apparatus.
Innovation Solution
An image processing apparatus that acquires image data, derives angle information, and corrects optical profiles based on surface angles to evaluate the surface state of objects with three-dimensional shapes, using a configuration that includes a CPU, ROM, RAM, video card, and an imaging apparatus to derive evaluation values for surface irregularities like orange peel.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If image processing assumes a planar surface, then the evaluation process is simple, but the measurement precision deteriorates for non-planar surfaces
Solution Approach 1:
The patent changes the parameter assumptions from planar surface (constant angle) to non-planar surface (variable angle). It introduces angle information as a new parameter that varies across the surface, and uses this to correct optical profiles. This transforms the evaluation process from assuming uniform conditions to accounting for spatially varying conditions, thereby improving measurement precision for non-planar surfaces.
Solution Approach 2:
The patent introduces angle information as an intermediary parameter between the imaging apparatus and the surface evaluation. This angle information acts as a mediator that corrects the optical profile by compensating for the effect of non-planar surface geometry, enabling accurate evaluation without requiring complex direct measurements of surface irregularities.
2Measurement precision
If contact measurement apparatus is used, then measurement precision for line profiles is high, but the versatility deteriorates due to inability to measure non-contact and only single line
Solution Approach 1:
The patent replaces the mechanical contact measurement system with a non-contact optical imaging system. Instead of using physical probes to measure line profiles, it uses an imaging apparatus to capture images of the entire surface and processes these images to extract optical profiles. This substitution maintains measurement precision while dramatically improving versatility by enabling non-contact measurement of entire surfaces rather than single lines.
3Measurement precision
If optical profile correction based on angle information is applied, then measurement precision for non-planar surfaces improves, but the device complexity increases
Solution Approach 1:
The patent performs preliminary acquisition of angle information about the surface geometry before conducting the optical profile correction. By obtaining angle data in advance and using it to pre-correct the optical profiles, the system avoids the need for complex real-time calculations during evaluation, thereby improving precision for non-planar surfaces while managing system complexity through staged processing.
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 accurate evaluation of surface states on non-planar objects by correcting optical profiles based on surface angles, ensuring high precision in assessing surface irregularities such as orange peel.
Implementation Method 1
an imaging apparatus that images the object... an attribute of an image reflected on the surface of the object
Data Source
AI summary
An image processing apparatus acquires, based on a captured image of an evaluation target object, an optical profile indicating an attribute of an image reflected on a surface of the object. The image processing apparatus also acquires angle information about an angle at each position of the surface of the object relative to an imaging apparatus that captures the image of the object, and corrects the optical profile based on the angle information. The image processing apparatus then acquires an evaluation value indicating a state of the surface of the object based on the corrected optical profile.