3D Data Acquisition Using Multi-Directional Laser Projection
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Solution Overview
Problem
Conventional 3D laser scanners require high manufacturing costs and complex calibration processes, and methods without transmission components often provide limited resolution for specific regions, making it challenging to quickly and precisely acquire 3D data with adjustable resolutions at low costs.
Innovation Solution
A method and system that project laser light onto multiple regions of an object, capturing images from two directions to generate 2D coordinates, which are then processed to obtain 3D data using calibration parameters and projection matrices, allowing for adjustable scan resolutions and real-time image processing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If conventional 3D laser scanners use transmission components such as rotating mechanisms or moving mechanisms to acquire 3D data in a wider range, then the measurement range is improved, but the manufacturing cost and device complexity increase
Solution Approach 1:
The patent removes transmission components (rotating mechanisms, moving mechanisms) from the system, extracting only the essential function of capturing 3D data from multiple positions. This is achieved by using a fixed camera system with multiple image capture devices arranged in different positions, eliminating the need for mechanical transmission while maintaining wide measurement coverage
Solution Approach 2:
The patent combines multiple image capture devices into a single integrated system that simultaneously captures images from multiple positions. By merging the functions of multiple cameras and combining their data through coordinate transformation, the system achieves wide measurement range without requiring mechanical movement or rotation
2Area of stationary object
If conventional 3D laser scanners use transmission components such as rotating mechanisms or moving mechanisms, then additional calibration processes are required, but the measurement range is improved
Solution Approach 1:
The patent eliminates transmission components that require complex calibration, using instead a fixed multi-camera system where calibration is simplified to establishing coordinate transformations between fixed positions, removing the need for dynamic calibration during movement
Solution Approach 2:
The patent performs coordinate system calibration in advance for each fixed image capture position before actual measurement. This preliminary calibration establishes transformation matrices that are then used during measurement without requiring real-time calibration, simplifying the overall process
3Device complexity
If structured light projection is used without transmission components, then the system is simpler, but the resolution for local or particular regions is limited
Solution Approach 1:
The patent divides the measurement task into multiple segments by using several image capture devices, each focused on specific regions. By segmenting the field of view and assigning different cameras to capture different areas, the system achieves high local resolution while maintaining overall system simplicity
Solution Approach 2:
The patent implements different quality levels for different regions by allowing selective adjustment of resolution for specific areas of interest. The system can allocate more imaging resources (multiple cameras, higher resolution settings) to particular regions that require detailed measurement, while using lower resolution for other areas
4Measurement precision
If adjustable resolutions are implemented for quick and precise 3D data acquisition, then measurement precision is improved, but device complexity and cost increase
Solution Approach 1:
The patent implements dynamic resolution adjustment through software control rather than hardware changes. The system can dynamically select which image capture devices to use and at what resolution based on the measurement requirements, allowing flexible adaptation to different precision needs without increasing physical device complexity
Solution Approach 2:
The patent achieves adjustable resolution by changing operational parameters (which cameras are activated, their focal lengths, aperture settings) rather than changing the physical hardware configuration. This allows the system to adapt resolution levels for different measurement scenarios using the same fixed device setup
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
Enables quick and precise 3D data acquisition with adjustable resolutions at low costs, enhancing applicability in various fields by generating 3D models through triangular meshes.
Implementation Method 1
a light projecting device (110), adapted to project a laser light onto a plurality of regions on a surface of the object so as to form a plurality of features within each of the regions
Data Source
AI summary
A method for three-dimensional data acquisition, adapted to acquire three-dimensional data of an object, includes the following steps. A laser light is projected onto a plurality of regions on the surface of the object so as to form a plurality of features within each of the regions. For each of the regions, the object and the features are captured from a first direction and a second direction simultaneously so as to generate a first object image corresponding to the first direction and a second object image corresponding to the second direction. For each of the regions, the first object image and the second object image are processed so as to obtain the two-dimensional coordinates of the features therein. The three-dimensional data of the object is obtained according to the two-dimensional data of the features in the first object image and the second object image corresponding to each of the regions.