3D Image Acquisition with Asymmetric Camera Angles
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Solution Overview
Problem
Existing three-dimensional image acquisition systems for on-line analysis of objects, such as electronic circuits, face challenges in achieving rapid and efficient processing of information due to poor quality reconstruction, especially when dealing with varying three-dimensional structures and shading effects.
Innovation Solution
A three-dimensional image acquisition device comprising at least two distinct systems, each with a projector and four cameras aligned in a specific configuration to minimize shading and maximize detection sensitivity, using alternating lighting devices and image sensors positioned at inclined angles to ensure comprehensive coverage and high-resolution reconstruction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional projector and camera systems are used for three-dimensional reconstruction, then the system structure is simple, but the reconstruction quality is poor due to shading effects and limited detection angles
Solution Approach 1:
The system divides the detection task into multiple independent projector-camera pairs, with each pair capturing data from a specific angular perspective. This segmentation allows comprehensive coverage of the three-dimensional scene while maintaining manageable system complexity through modular architecture.
Solution Approach 2:
The invention introduces angular diversity as an additional dimension by positioning camera optical axes at distinct angles relative to the projector illumination plane. This angular dimension enables detection of surface normals and reduction of shading effects that cannot be achieved with conventional single-plane configurations.
2Measurement precision
If cameras are positioned with optical axes perpendicular to the projection direction, then the system configuration is simplified, but detection sensitivity and three-dimensional reconstruction accuracy are reduced
Solution Approach 1:
The system employs asymmetric camera positioning where optical axes form distinct angles with the projector illumination plane rather than being uniformly perpendicular. This asymmetric arrangement optimizes detection sensitivity for three-dimensional reconstruction by capturing reflected light from multiple angular perspectives.
Solution Approach 2:
Each camera is positioned with specific angular characteristics optimized for its detection task. The distinct angles allow each camera to capture local surface information with optimal sensitivity, and the combined data from multiple cameras provides comprehensive three-dimensional coverage.
3Reliability
If fewer cameras are used per projector, then the system is simpler and less costly, but the three-dimensional reconstruction reliability and coverage are insufficient
Solution Approach 1:
The invention merges data from multiple cameras observing the same projector illumination from different angles. This combination of multiple perspectives provides redundant information that improves reconstruction reliability and enables robust handling of occlusions and shading effects.
Solution Approach 2:
The system uses feedback from multiple camera observations to validate and refine the three-dimensional reconstruction. The distinct angular views provide cross-validation of surface geometry, improving reliability by detecting and correcting errors that might occur with fewer cameras.
4Productivity
If rapid image processing is required for on-line analysis, then processing speed must be increased, but image quality and reconstruction accuracy may be compromised
Solution Approach 1:
The system performs preliminary data acquisition from multiple angles simultaneously using synchronized projector-camera pairs. This preliminary capture of comprehensive angular data enables rapid processing later without sacrificing quality, as all necessary information is collected in parallel during the initial scanning phase.
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 reliable, rapid, and precise three-dimensional reconstruction of scenes with reduced shading effects, ensuring high-resolution images across all axes without the limitations of existing systems, improving detection sensitivity and reproducibility.
Implementation Method 1
illuminate a scene using one or more pattern projectors positioned above the scene and, using one or two monochrome or color cameras, to detect the shape of the patterns obtained on the three-dimensional scene
Implementation Method 2
using one or two monochrome or color cameras, to detect the shape of the patterns obtained on the three-dimensional scene
Data Source
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Figure 3
Figure 4~5
AI summary
The invention relates to a three-dimensional image acquisition system including: at least two projectors (20) aligned in a direction (x) and suitable for illuminating a scene (22), the projection axes of the projectors defining a plane for each projector (20), and being turned toward the scene (22), a first and second camera (24, 26) placed on one side of said plane, and a third and fourth camera (24', 26') placed on the other side of said plane, the optical axis of the first and second cameras (24, 26) forming, with said plane, a different first and second angle, respectively, the optical axis of the third and fourth cameras (24', 26') forming, with said plane, a different third and fourth angle, respectively.