3D Scanner Digital Micromirror Binary Pattern Encoding
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Solution Overview
Problem
Existing 3D scanning technologies face limitations in achieving real-time operation and accuracy, particularly with structured light methods, due to issues like texture sensitivity and high precision requirements, which make them expensive and inefficient for capturing moving objects.
Innovation Solution
A 3D scanning system utilizing a digital light encoding unit with a digital micromirror device to project binary pattern elements onto an object, synchronized with a detector to decode distortions in the reflected light, allowing for real-time 3D shape determination using binary data processing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional structured light methods are used to obtain 3D shape information, then measurement precision can be achieved, but real-time operation is not possible due to the need for multiple views obtained by rotating the object
Solution Approach 1:
The patent applies periodic action by projecting rapidly changing light patterns (sequences of light patterns) onto the object and capturing them with a high-speed camera. The system projects multiple light patterns in rapid succession and captures corresponding images, enabling real-time 3D reconstruction without requiring physical rotation of the object. This periodic projection and capture sequence achieves both measurement precision and real-time operation.
Solution Approach 2:
The patent employs dynamics by using rapidly changing light patterns that are projected in sequence at high frame rates. The system dynamically updates the light patterns and corresponding camera captures to reconstruct 3D shapes in real-time, replacing the static multiple-view approach with a dynamic single-view sequence that achieves real-time performance.
2Measurement precision
If 3DV-systems with high precision requirements are used, then measurement accuracy is improved, but cost and sensitivity to textures increase
Solution Approach 1:
The patent applies parameter changes by modifying the light patterns from static to rapidly changing sequences, and by changing the capture rate to match the projection rate. This allows the system to achieve high measurement accuracy through computational methods rather than relying on expensive hardware or complex sensor systems, thereby reducing device complexity and cost while maintaining precision.
Solution Approach 2:
The patent replaces complex mechanical scanning systems with a computational approach. Instead of using mechanical rotation or complex sensor arrays, the system uses sequential light pattern projection and image capture combined with computational algorithms to reconstruct 3D shapes, thereby reducing hardware complexity and cost while maintaining measurement accuracy.
3Productivity
If coded light patterns are projected to achieve real-time 3D reconstruction, then scanning speed is improved, but texture matching problems cause significant inaccuracies
Solution Approach 1:
The patent applies copying by using synthetic light patterns that are projected onto the object and captured by the camera. The system creates a copy of the light pattern sequence and uses this synthetic information to compute 3D shapes, avoiding the need for complex texture matching while maintaining real-time reconstruction speed and accuracy.
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 efficient and accurate real-time 3D scanning by processing binary data from each pixel, reducing the need for high-speed grayscale data transmission and enhancing system speed and cost-effectiveness.
Implementation Method 1
a digital light encoding unit comprising a digital micromirror device for encoding a succession of structural light signals onto a light beam directed to an object
Implementation Method 2
a detector synchronized with the digital light processing unit for detecting reflections of the light beam from the object
Data Source
AI summary
A 3D scanning device comprises: a digital light encoding unit comprising a digital micromirror device for encoding a rapidly changing shape signal onto a light beam directed to an object, a shape of said signal being selected such that distortions thereof by a contoured object reveal three-dimensional information of said contour; a detector synchronized with said digital light processing unit for detecting reflections of said light beam from said object, and a decoder for determining a 3D shape of said object from distortions of said signal in said detected reflections.