Colorimeter Chart Region Detection and Patch Alignment
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Solution Overview
Problem
Existing colorimetric devices struggle to accurately determine the chart region and automatically align with the correct position for color measurement, especially when the color chart includes normal image regions, leading to potential erroneous detection of patch positions.
Innovation Solution
A colorimetric device and method that extract chart region candidates from images, calculate evaluation values to determine the chart region, and then measure patch positions within the determined region, using image processing techniques to differentiate between chart regions and normal image regions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If automatic patch position measurement is performed without chart region determination, then measurement speed is improved, but measurement precision deteriorates due to erroneous detection in normal image regions
Solution Approach 1:
The patent divides the color chart into chart region and normal image region, and further segments the chart region into multiple patches. By first determining the chart region boundaries and then identifying individual patches within that region, the system avoids erroneous detection in normal image regions while maintaining efficient automated measurement across all valid patches.
2Measurement precision
If chart region determination is performed, then measurement precision is improved, but device complexity increases due to additional image processing steps
Solution Approach 1:
The patent introduces a chart region determination step as an intermediary process between image acquisition and patch position measurement. This intermediary step uses image processing to identify chart region boundaries and characteristics, which then guides the subsequent patch detection. By separating these functions into distinct stages, the system manages complexity while improving precision.
3Measurement precision
If manual alignment is performed, then measurement precision is improved for each patch, but productivity deteriorates due to time-consuming manual operation
Solution Approach 1:
The patent implements automatic chart region determination and patch position identification through image processing algorithms. The system self-determines the chart region boundaries, identifies individual patches, and guides the colorimetric measurement without requiring manual alignment operations. This automation maintains high measurement precision while significantly improving productivity by eliminating time-consuming manual steps.
Data Source
AI summary
A colorimetric device and a colorimetric method according to the present invention extract a chart region candidate, which is a candidate for a chart region, from an image of a color chart, obtain an evaluation value of this chart region candidate, determine whether or not the chart region candidate is the chart region based on this obtained evaluation value, obtain each position of a plurality of patches for the chart region candidate determined as the chart region as a result of the determination and colorimetrically measure each of the patches at each obtained position of the plurality of the patches.