3D Measurement Device Image Selection for Marker Accuracy
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Solution Overview
Problem
Existing three-dimensional measurement techniques using markers and multiple cameras face challenges in achieving accurate measurements due to the inclusion of images from cameras at inappropriate distances, which do not contribute to improved accuracy.
Innovation Solution
A three-dimensional measurement device and method that includes an image selection unit to choose relevant images based on detected markers, a marker position identification unit to calculate positional information, and an image reselection unit to refine the image selection based on camera-marker relationships, ensuring only images within an optimal range contribute to accurate measurements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If images from all cameras are used for three-dimensional measurement, then the quantity of measurement data increases, but the measurement precision does not improve and may deteriorate due to inclusion of images from inappropriate distances
Solution Approach 1:
The patent applies parameter changes by evaluating and selecting images based on the distance parameter between cameras and markers. The image selection unit calculates distances and selectively uses only those images where the distance falls within an appropriate range, transforming the approach from using all images to using only images with optimal parameters for measurement accuracy
Solution Approach 2:
The patent implements local quality by applying different selection criteria to different images based on their individual characteristics. Each image is evaluated independently based on its camera-to-marker distance, and only images with locally optimal quality (appropriate distance) are selected for the three-dimensional measurement, rather than treating all images uniformly
2Quantity of substance
If images from cameras at inappropriate distances are included, then the quantity of data increases, but the reliability of measurement results deteriorates
Solution Approach 1:
The patent applies the taking out principle by extracting and removing images with inappropriate camera-to-marker distances from the dataset. The image selection unit identifies and excludes images that do not meet the distance criteria, ensuring that only reliable images with appropriate geometric relationships are used for measurement, thereby improving overall measurement reliability
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
This approach enhances the accuracy of three-dimensional measurements by selectively using images from cameras positioned optimally relative to the marker, improving the stability and reliability of positional information identification.
Implementation Method 1
acquiring three-dimensional time-series positional information regarding the marker by measuring motions of the marker upon a principle of triangulation
Data Source
AI summary
There is provided a three-dimensional measurement device which includes an image selection unit that selects plural images in which the marker is detected, from among images captured by the plural cameras placed at different positions in a three-dimensional space where the marker exists, a marker position identification unit that identifies positional information regarding the marker in the three-dimensional space with use of the plural images, and an image reselection unit that reselects some of the plural images, on the basis of relationships between the positional information identified by the marker position identification unit and positional information regarding the plural cameras, and in which the marker position identification unit reidentifies the positional information with use of the reselected images.