Image Measuring Apparatus With Adaptive Distortion Correction
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Solution Overview
Problem
Conventional image measuring apparatuses face challenges in maintaining measurement accuracy due to environmental changes affecting camera lenses and light-receiving elements, necessitating time-consuming processes for distortion correction by replacing reference patterns, which hinders flexible distortion correction.
Innovation Solution
An image measuring apparatus with a built-in reference pattern display unit allows for automatic distortion information acquisition and correction without replacing patterns, enabling flexible distortion correction in response to environmental changes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If distortion information is obtained by comparing captured images with reference patterns, then measurement accuracy is improved, but the process becomes time-consuming when environmental changes occur
Solution Approach 1:
The patent applies preliminary action by pre-storing distortion information for multiple environmental conditions (temperature, humidity) in a database before actual measurement. When measurement occurs, the system queries the pre-stored data based on current environmental conditions, eliminating the need for time-consuming real-time distortion correction processes.
Solution Approach 2:
The patent creates a virtual copy of the reference pattern as digital distortion information stored in a database. Instead of physically comparing captured images with physical reference patterns, the system uses pre-generated digital distortion models that replicate the optical characteristics under various environmental conditions, enabling rapid retrieval and application without physical manipulation.
2Reliability
If distortion correction is performed by replacing reference patterns on the stage, then distortion information can be updated, but the operation complexity increases
Solution Approach 1:
The patent replaces the mechanical system of physically placing and removing reference patterns from a stage with a digital information system. Distortion information is stored as digital data in a database and retrieved electronically based on environmental conditions, eliminating mechanical operations while maintaining the reliability of distortion correction.
Solution Approach 2:
The system performs self-service by automatically determining which distortion information to use based on current environmental conditions. The control unit queries the database and retrieves appropriate distortion parameters without requiring manual intervention or physical replacement of reference patterns, simplifying operations while maintaining accuracy.
3Measurement precision
If camera calibration is performed using conventional methods, then distortion can be corrected, but the process cannot respond flexibly to environmental changes
Solution Approach 1:
The patent implements feedback by continuously monitoring environmental conditions (temperature, humidity) and using this information to select appropriate pre-stored distortion data. This closed-loop system ensures that the distortion correction always corresponds to current environmental conditions, providing flexible adaptation while maintaining measurement precision.
Solution Approach 2:
The system transitions from static distortion correction to dynamic adaptation by storing distortion information for multiple environmental conditions and selecting the appropriate data based on real-time environmental sensing. This enables the system to dynamically adjust distortion correction parameters in response to changing conditions without requiring re-calibration.
Data Source
AI summary
An image measuring apparatus that can flexibly perform distortion correction in response to environmental changes is provided. The image measuring apparatus according to the present invention comprises: a stage on which a measurement target is placed; a reference pattern display unit on which a reference pattern is displayed; an image capturing unit that captures images of a subject; a distortion information generation unit that generates distortion information based on an image of the reference pattern captured by the image capturing unit and design information of the reference pattern; and a correction unit that corrects an image of the measurement target captured by the image capturing unit using the distortion information.