Multi-line Laser 3D Imaging Using Random Lattice Scanning
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Solution Overview
Problem
Existing three-dimensional imaging systems based on multi-line lasers face challenges such as low scanning efficiency, complex system implementation, insufficient output power, and poor calibration accuracy, leading to noise points and incorrect spatial position information, especially when dealing with complex and disorderly scenarios.
Innovation Solution
A multi-line laser three-dimensional imaging method and system utilizing a random lattice pattern, where a random lattice laser light source projects a pattern on an object, and a high-reflection mirror rotates to pan and scan laser lines, allowing for sub-pixel extraction and area-based matching to accurately locate laser lines and generate point cloud data through triangulation measurement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If multi-line laser is used for three-dimensional imaging, then scanning efficiency is improved, but system complexity increases and calibration accuracy deteriorates
Solution Approach 1:
The patent segments the imaging process into two independent parts: a stationary random lattice projector and a rotating multi-line laser scanner. This segmentation allows each component to be optimized independently - the lattice projector provides stable reference patterns while the laser module handles rapid scanning, thereby improving scanning efficiency without proportionally increasing overall system complexity
Solution Approach 2:
The random lattice pattern serves as an intermediary reference that mediates between the laser lines and the imaging system. By providing distinctive lattice features that can be easily recognized and matched, it simplifies the calibration process and improves calibration accuracy, counteracting the complexity introduced by multi-line laser scanning
2Productivity
If multi-line laser is used for three-dimensional imaging, then scanning efficiency is improved, but measurement precision deteriorates due to incorrect laser line sequence recognition
Solution Approach 1:
The system implements feedback through the random lattice pattern recognition process. The lattice features provide continuous reference information that allows the system to verify and correct laser line sequence identification in real-time, ensuring measurement precision is maintained even at high scanning speeds
Solution Approach 2:
The patent uses the random lattice pattern as a visual reference system with distinctive spatial features that can be easily differentiated. This pattern acts like a visual code that provides unambiguous reference points for determining laser line sequences, preventing recognition errors that would compromise measurement precision
3Measurement precision
If LED structured light is used for three-dimensional imaging, then imaging accuracy is improved, but brightness and contrast are insufficient for large-view-field imaging
Solution Approach 1:
The patent merges the advantages of LED structured light (accuracy through pattern recognition) with the advantages of laser (brightness and contrast). The random lattice provides the accurate reference pattern while the laser illumination ensures sufficient brightness and contrast for large-view-field imaging, combining both benefits into a single system
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 improves data accuracy, reduces noise points, and enhances scanning efficiency, enabling rapid and precise three-dimensional reconstruction suitable for industrial applications like disorderly feeding and sorting, with improved system adaptability and reduced deployment complexity.
Implementation Method 1
a random lattice laser light source projects a random lattice pattern on an object
Implementation Method 2
laser light emitted from a multi-line laser light source is reflected onto a surface of the object by a high-reflection mirror
Implementation Method 3
image capture is performed on the object to obtain a background image containing a lattice pattern
Data Source
AI summary
The multi-line laser three-dimensional imaging method and system is based on a random lattice. A multi-line laser is used and combined with a rotating mechanism to realize a large-view-field rapid scanning effect, such that the working efficiency is improved by orders of magnitude, and the deployment difficulty of the system is reduced. Due to the fact that within an imaging range, pattern features of the random lattice of each local area have uniqueness, a plurality of laser lines are extracted, position sequence numbers are distinguished, and noise points are reduced through mutual verification of the pattern features of the random lattice between adjacent images, such that the quality of three-dimensional point cloud data is greatly improved. The method and the system can be applied to industrial applications, such as disorderly grabbing, feeding and discharging, unstacking and stacking, logistics sorting and the like.