Hybrid Patterned Light for 3D Measurement Precision
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Solution Overview
Problem
Conventional three-dimensional measurement technologies face challenges in accurately decoding patterned light on small measurement targets using structured light patterns and struggle with low accuracy in stereo camera methods, particularly on flat or reflective surfaces with little texture.
Innovation Solution
A hybrid three-dimensional measurement system that projects a pattern combining a two-dimensionally coded structured light pattern with a random pattern, allowing for accurate decoding and high reconstruction ability by using both cameras for triangulation and stereo matching.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a two-dimensionally coded structured light pattern is projected onto a measurement target, then the image clarity and measurement precision are improved, but the reconstruction ability for small measurement targets deteriorates because it becomes difficult to accurately decode the code of the patterned light
Solution Approach 1:
The patent combines two different patterns (two-dimensionally coded structured light pattern and random pattern) into a single hybrid pattern that is projected onto the measurement target. This merging allows the system to simultaneously achieve the measurement precision of structured light and the reconstruction ability of random patterns, resolving the contradiction between these two features.
Solution Approach 2:
The patent creates a composite light pattern by superimposing the structured light pattern and random pattern. This composite pattern integrates the advantages of both component patterns: the coded structure provides measurement precision while the random elements provide reconstruction ability for small targets.
2Adaptability or versatility
If a stereo camera method is used to measure three-dimensional shape, then the reconstruction ability for small measurement targets is improved, but the measurement precision deteriorates due to difficulty in detecting corresponding points on flat or reflective surfaces with little texture
Solution Approach 1:
The patent merges the stereo camera system with the hybrid pattern projection system. The structured light component of the hybrid pattern provides artificial texture that enables accurate corresponding point detection, thereby improving measurement precision while maintaining the reconstruction ability of the stereo system.
Solution Approach 2:
The patent applies the hybrid pattern specifically to the measurement target surface, creating local quality enhancement in the form of artificial texture. This localized pattern application improves corresponding point detection on flat or reflective surfaces without requiring changes to the overall measurement system architecture.
3Measurement precision
If only a two-dimensionally coded structured light pattern is used, then the measurement precision is improved, but the device complexity increases due to the need for accurate pattern decoding and calibration
Solution Approach 1:
The patent combines the structured light pattern with a random pattern in a hybrid configuration. The random pattern component simplifies the decoding process by providing naturally distinguishable features, thereby reducing the overall system complexity while maintaining measurement precision through the structured light component.
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 hybrid pattern system enhances image clarity and reconstruction ability of three-dimensional point group data, overcoming limitations of structured light and stereo camera methods by integrating the strengths of both patterns without interference.
Implementation Method 1
active measurements, a measurement target is captured in a state where patterned light is projected onto it, and the three-dimensional shape (three-dimensional position of each pixel) of the measurement target is acquired from the position of the pattern on the captured image using the principle of triangulation
Implementation Method 2
an image capturing unit including a first camera and a second camera configured to capture the measurement target onto which the patterned light is projected
Data Source
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AI summary
Provided is a three-dimensional measurement technology whose reconstruction ability of three-dimensional point group data and image clarity of a measurement target are higher than those of conventional technologies. Three-dimensional measurement is performed by projecting patterned light having a hybrid pattern Ph onto a measurement target. The hybrid pattern Ph is a pattern in which a random pattern Pr is superimposed on a structured light pattern Ps, and is arranged in pattern such that the random pattern Pr and the structured light pattern Ps do not interfere mutually. In this manner, it is possible to obtain both advantages of a structured light pattern that is excellent in the image clarity and a random pattern that is excellent in the reconstruction ability of the three-dimensional point group data.