Dynamic Pattern Light Projection for 3D Measurement Accuracy
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Solution Overview
Problem
Existing methods for acquiring three-dimensional position information using range imaging face challenges in improving measurement density while maintaining accurate identification of distance measurement figures, especially in variable environments or when capturing a single range image, leading to issues with detection accuracy and erroneous detection.
Innovation Solution
A measurement apparatus that adjusts the pattern shape of a projection pattern based on the identification resolution, using a setting unit to determine the range of variation in the object's position and orientation, and changes the pattern shape accordingly to optimize the density and accuracy of distance measurement figures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the density of distance measurement figures is increased to improve measurement density, then measurement precision is improved, but detection accuracy deteriorates due to erroneous detection between adjoining figures
Solution Approach 1:
The patent applies local quality by making identification figures have different sizes according to their positions in the projection pattern. Identification figures at locations with smaller intervals between distance measurement figures are made larger, while those at locations with larger intervals are made smaller. This local adaptation ensures that identification figures remain distinguishable even in high-density regions, preventing erroneous detection while maintaining measurement precision throughout the entire pattern.
2Reliability
If the number of elements in identification figures is increased to improve identification accuracy, then detection accuracy is improved, but device complexity increases making threshold setting difficult
Solution Approach 1:
The patent applies parameter changes by dynamically adjusting the size parameter of identification figures based on the interval between distance measurement figures at each location. Instead of using a fixed number of elements or fixed size for all identification figures, the system changes the size parameter locally according to the projection pattern's spatial characteristics. This simplifies threshold setting by using size-based differentiation rather than complex multi-parameter identification.
3Productivity
If a single projection pattern is used to acquire range images quickly, then productivity is improved, but detection accuracy deteriorates in variable environments
Solution Approach 1:
The patent applies dynamics by creating a projection pattern where identification figures have variable sizes according to their positions, rather than using a static uniform pattern. This dynamic arrangement of identification figures at different scales allows the single projection pattern to adapt to variable environments and measurement conditions, maintaining high detection accuracy while preserving the speed advantage of using only one pattern.
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 allows for stable and efficient acquisition of range images with improved detection accuracy and reduced erroneous detection, even in variable environments, by dynamically adjusting the pattern shape to match the object's position and orientation uncertainty.
Implementation Method 1
a projection unit configured to project pattern light onto an object to be measured
Implementation Method 2
an imaging unit configured to capture an image of the object to be measured on which the pattern light is projected
Data Source
AI summary
A measurement apparatus includes a projection unit configured to project pattern light onto an object to be measured, an imaging unit configured to capture an image of the object to be measured on which the pattern light is projected to acquire a captured image of the object to be measured, a measurement unit configured to measure a position and/or orientation of the object to be measured on the basis of the captured image, a position and orientation of the projection unit, and a position and orientation of the imaging unit, a setting unit configured to set identification resolution of the pattern light using a range of variation in the position and/or orientation of the object to be measured; and a change unit configured to change a pattern shape of the pattern light in accordance with the identification resolution.