3D Scan System Dynamic Focal Plane Adjustment
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Solution Overview
Problem
Existing three-dimensional scan systems are limited by the physical nature of their components, which restrict the effective scan depth and require costly hardware adjustments to increase it, making them inflexible and less accurate outside a specific depth of field.
Innovation Solution
The system separates the optimal image formation focal plane from the optimal image capturing focal plane, allowing for a greater effective scan depth without hardware changes, using a projection device, image capturing module, and image formation device with distinct focal planes and an adjustment mechanism to calibrate the system.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the scan device uses fixed physical components for depth of field control, then the depth of field is limited to a specific range, but increasing the depth of field requires costly hardware adaptations
Solution Approach 1:
The patent implements dynamic focal plane adjustment by moving the image formation device between a first focal plane (for projecting the light pattern) and a second focal plane (for capturing the reflected pattern). This dynamic switching allows the system to maintain accurate depth measurements across a broader depth range without requiring multiple fixed physical components, thereby resolving the contradiction between measurement precision and adaptability.
2Measurement precision
If the scan device is designed for a specific depth of field, then it achieves high measurement precision within that range, but it becomes inflexible in manufacturing and costly to adapt for different depth requirements
Solution Approach 1:
The system uses a movable image formation device that can dynamically switch between two focal planes, eliminating the need to manufacture different hardware configurations for different depth requirements. This dynamic approach maintains high measurement precision while significantly improving manufacturing flexibility and reducing adaptation costs.
Solution Approach 2:
The patent changes the focal plane parameter dynamically by moving the image formation device between two positions. This parameter change allows the same physical components to serve multiple depth measurement functions, improving ease of manufacture while maintaining measurement precision across different depth ranges.
3Device complexity
If the image formation device uses a single focal plane, then the device structure is simple, but the effective scan depth is limited
Solution Approach 1:
The patent introduces minimal complexity by implementing a movable image formation device that switches between two focal planes. This dynamic mechanism extends the effective scan depth range significantly while adding only moderate structural complexity, achieving a favorable balance between device simplicity and functional versatility.
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 configuration enables the system to effectively scan objects over a broader depth range, maintaining resolution and flexibility in manufacturing, while optimizing image processing to enhance depth information accuracy.
Implementation Method 1
An optimal image formation focal plane of the image formation device for forming the predetermined pattern is different from an optimal image capturing focal plane of the image formation device for projecting the projected pattern
Data Source
AI summary
A three dimensional scan system includes a projection device, an image capturing module and an image formation device. The projection device includes a lighting module for providing a light beam, and a pattern generator for receiving the light beam and project a predetermined pattern. The image capturing module is used to capture images. The image formation device is used to form a projected pattern by projecting the predetermined pattern onto an object, and to project an image of the object and the projected pattern to the image capturing module. An optimal image formation focal plane of the image formation device for forming the predetermined pattern is different from an optimal image capturing focal plane of the image formation device for projecting the projected pattern.