Image Processing Apparatus Distance Guide for Surface Evaluation
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Solution Overview
Problem
Existing methods for evaluating an object's surface state, such as those with fine asperities (orange peel), face challenges in accurately calculating evaluation values due to variations in image capturing distance, which affect the size and pixel pitch of the illumination image.
Innovation Solution
An image processing apparatus is developed to acquire distance information between the subject and the image capturing apparatus, calculate geometric conditions based on this information, and display guide information to ensure the correct image capturing distance for evaluating the object's surface state effectively.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the image capturing distance is not controlled, then the imaging process is flexible and easy to operate, but the spatial frequency characteristics of the reflected illumination image become unreliable for accurate surface state evaluation
Solution Approach 1:
The system performs preliminary calculation of the geometric condition (optical path length) before image capturing based on the evaluation target spatial frequency component. The guide information displaying unit then displays this pre-calculated geometric condition to guide the user in setting the appropriate image capturing distance, ensuring accurate spatial frequency measurement while simplifying user operation.
2Adaptability or versatility
If the image capturing distance varies, then the imaging process is more adaptable to different scenarios, but the pixel pitch and size of the illumination image change making evaluation value calculation unreliable
Solution Approach 1:
The system calculates the appropriate geometric condition (image capturing distance) based on the desired evaluation target spatial frequency component and provides feedback through the guide information displaying unit. This feedback mechanism ensures that the image capturing distance is set correctly to maintain reliable evaluation values while allowing adaptability to different imaging scenarios.
3Loss of information
If the geometric condition is not considered, then the imaging process is simpler and faster, but the inclusion of desired spatial frequency components cannot be ensured
Solution Approach 1:
The geometric condition calculation is performed in advance before image capturing. The system calculates the optimal geometric condition based on the evaluation target spatial frequency component and displays this information to guide the user. This preliminary calculation ensures that the desired spatial frequency components are included in the captured image while maintaining a relatively simple overall process.
Data Source
AI summary
An evaluation value for evaluating an object surface state is calculated in a more suitable form. An image processing apparatus acquires distance information about a distance between an image capturing apparatus and a subject, acquires image capturing apparatus information about the image capturing apparatus, and calculates a geometric condition on a positional relationship between a light source, the subject, and the image capturing apparatus based on the distance information and the image capturing apparatus information.