Compact Measurement Apparatus Using Dynamic Position Calculation
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Solution Overview
Problem
Existing measurement techniques using the stereo method face challenges in achieving high measurement accuracy while maintaining a compact apparatus size and usability, particularly due to the need for stable positional relationships between image capturing elements and the limitations imposed by the triangulation principle.
Innovation Solution
A measurement apparatus that includes a projection apparatus for projecting a predetermined pattern and an image capturing system capturing images from multiple viewpoints, where the distance between viewpoints is shorter than the distance between the projection apparatus and viewpoints. This apparatus uses a processor to calculate relative positions and acquire distance information by integrating pattern image positions and positional relationships between viewpoints.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the baseline length between two elements is increased to obtain high measurement accuracy according to the triangulation principle, then measurement accuracy is improved, but the mechanical stability decreases and the size of the mechanism for holding the two elements increases
Solution Approach 1:
The patent replaces the mechanical system with a fixed baseline length with a computational system that calculates the relative position between the image capturing apparatus and projection apparatus. Instead of relying on a long physical baseline for measurement accuracy, the system uses image processing and coordinate transformation to achieve high precision with a compact mechanical structure.
2Reliability
If the positional relationship between two elements is fixed to be known and stable under temperature environment and vibration, then measurement stability is improved, but the configuration becomes complex and the size increases
Solution Approach 1:
The patent makes the system adaptable by allowing the relative position between the image capturing apparatus and projection apparatus to be dynamically calculated rather than statically fixed. The system can adjust to environmental changes and vibrations by computing the actual relative position from captured images, maintaining measurement stability without requiring a complex fixed mechanical structure.
Solution Approach 2:
The system performs self-calibration by automatically calculating the relative position between components using the captured images and pattern recognition. Instead of requiring external calibration procedures or complex mechanical alignment mechanisms, the system uses its own captured data to determine and correct positional relationships.
3Reliability
If the positional relationship between projection apparatus and image capturing apparatus is fixed, then measurement stability is improved, but the adjustable range of projection position and direction is limited, decreasing usability
Solution Approach 1:
The patent enables the projection apparatus to be dynamically positioned and oriented while maintaining measurement stability through computational correction. The system calculates the actual relative position and uses coordinate transformation to compensate for changes in projection position and direction, allowing flexible adjustment without sacrificing 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
The solution enables high measurement accuracy with a simpler configuration and reduced apparatus size, while also allowing for adjustable projection patterns to enhance usability and avoid blockages caused by subject shape.
Implementation Method 1
a projection apparatus configured to project a predetermined pattern on a subject
Implementation Method 2
a technique for acquiring distance information and shape information of a subject using the triangulation principle from an image obtained by capturing
Data Source
AI summary
A measurement apparatus, comprising: a projection apparatus configured to project a predetermined pattern on a subject; and an image capturing system configured to capture a group of images from at least two different viewpoints, wherein the distance between the viewpoints is shorter than the distances between the projection apparatus and the viewpoints, the measurement apparatus further comprising: relative position calculation means for obtaining a relative position of the projection apparatus relative to at least one of the viewpoints from pattern image positions on the group of images and a positional relationship between the viewpoints, wherein distance information regarding the subject is acquired from the relative position and a pattern image position on an image at the viewpoint.