Dual-Camera 3D Scanning with Strobe Lighting
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Solution Overview
Problem
Existing structure from motion techniques face challenges with inconstant lighting causing micro faceting and movement errors during 3D object scanning, which affect the accuracy of image correspondence and quality of scans, especially when scanning flexible or deformable objects.
Innovation Solution
A dual-camera image capture system with controlled lighting, using a first camera for structural details and a second camera for color details, both moving systematically around a stationary object to minimize lighting and movement issues, while maintaining consistent illumination through high-intensity strobe lights with diffusion filters.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If structure from motion techniques are used to capture images from different vantage points, then 3D digital replica can be constructed, but inconstant lighting causes micro faceting that reduces image correspondence accuracy
Solution Approach 1:
The patent uses periodic strobe lighting to provide consistent illumination during image capture. The strobe lights are triggered at specific intervals synchronized with the turntable rotation, ensuring that each image is captured under controlled, consistent lighting conditions. This periodic action eliminates the micro faceting problem caused by inconstant lighting while maintaining accurate image correspondence for 3D reconstruction.
Solution Approach 2:
The patent introduces diffusion filters as an intermediary element between the strobe lights and the object being scanned. These filters soften and diffuse the light, reducing harsh shadows and highlights that cause micro faceting. The diffusion filters act as a mediator that maintains consistent illumination while eliminating the harmful lighting effects that degrade image correspondence accuracy.
2Adaptability or versatility
If object is rotated on turntable for scanning, then multiple vantage points are captured, but movement errors occur especially with flexible or deformable structures
Solution Approach 1:
The patent employs a dynamic scanning approach where the turntable rotates at a controlled, variable speed. The rotation speed can be adjusted based on the object's flexibility and deformability. For flexible objects, the system uses slower rotation speeds to minimize deformation, while for rigid objects, faster speeds are acceptable. This dynamic adjustment optimizes the balance between capturing multiple vantage points and maintaining scan precision.
Solution Approach 2:
The system incorporates feedback mechanisms to monitor and correct for object movement during scanning. Sensors detect the actual position and orientation of the object on the turntable, and this information is fed back to the control system. The control system then adjusts the image capture timing and processing to compensate for any movement errors, ensuring high scan quality even with flexible or deformable structures.
3Illumination intensity
If high-intensity strobe lights are used with diffusion filters, then consistent illumination is maintained, but device complexity increases
Solution Approach 1:
The patent designs the lighting system to serve multiple functions: the strobe lights provide both high-intensity illumination and consistent timing control, while the diffusion filters simultaneously soften the light and reduce shadows. This multi-functionality reduces the need for additional separate components, thereby limiting the increase in device complexity while achieving consistent illumination.
Solution Approach 2:
The system controls lighting parameters (intensity, duration, timing) to optimize performance without adding complex hardware. By adjusting the strobe duration and synchronization timing, the system achieves consistent illumination using simple, adjustable parameters rather than complex adaptive lighting systems. This parameter-based control maintains lighting consistency while keeping the device relatively simple.
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 approach enhances image quality by stabilizing lighting and reducing movement errors, resulting in higher quality 3D scans with improved computer-generated imagery and automatic scanning capabilities.
Implementation Method 1
maintaining consistent illumination through high-intensity strobe lights with diffusion filters
Data Source
AI summary
An image capture system includes: a first mobile unit configured to move around the target area; a second mobile unit adjustably coupled to the first mobile unit; a dual-camera unit, operatively coupled to the second mobile unit, including: a first camera to capture structural data; and a second camera to capture color data, wherein the first mobile unit and the second mobile unit are configured to move the first camera and the second camera.