Ortho-Correction Resolution Calculation for Infrastructure Defect Detection
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Solution Overview
Problem
Conventional image correction techniques for infrastructure inspection result in lower image resolution when capturing is not directly facing the structure, making it difficult to accurately detect defects, and often require high-resolution images that are effort-intensive to capture.
Innovation Solution
An image processing apparatus that calculates and displays the resolution of corrected images after ortho-correction, allowing users to determine if the image is suitable for defect detection and selecting the appropriate output resolution, thereby reducing the need for excessively high-resolution images.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If ortho-correction processing is performed on images captured from positions distant from directly opposite the inspection target, then the image can be corrected to appear as if captured from the directly opposite position, but the resolution of the corrected image becomes lower (coarser)
Solution Approach 1:
The patent performs resolution calculation as a preliminary action before actual defect detection. By calculating and displaying the resolution of the corrected image in advance, users can determine whether the image quality is sufficient for defect detection, avoiding unnecessary high-resolution capturing efforts when the correction distance is small and resolution loss is minimal.
Solution Approach 2:
The patent implements feedback by displaying resolution information to the user after ortho-correction processing. This feedback mechanism allows users to assess the quality of the corrected image and make informed decisions about whether the image is suitable for defect detection, or if re-capturing at higher resolution is necessary.
2Measurement precision
If excessively high resolution images are used to ensure adequate resolution after correction, then defect detection accuracy is maintained, but the effort to capture the image increases
Solution Approach 1:
The patent changes the parameter assessment approach by calculating and displaying resolution information as an intermediate parameter. This allows users to adjust their capturing strategy based on the calculated resolution - using higher resolution only when necessary (when correction distance is large), and accepting lower resolution when correction distance is small, thus optimizing the balance between detection accuracy and capturing effort.
3Adaptability or versatility
If ortho-correction processing is performed with large correction distances, then images captured from distant positions can be used, but the resolution becomes too coarse for accurate defect specification
Solution Approach 1:
The patent performs resolution calculation as a preliminary check before defect detection. By displaying the resolution information that results from the ortho-correction, users can predict whether the corrected image will have sufficient precision for defect specification, thereby avoiding attempts to detect defects in images where the correction distance has made the resolution too coarse.
Data Source
AI summary
In order to efficiently provide an image suitable for detecting a defect in a structure, an image processing apparatus inputs an image and a parameter for geometrically correcting the image, calculates a resolution of a corrected image obtained in a case of geometrically correcting the image using the parameter, and displays resolution information relating to the calculated resolution in association with the image.