Laser-Line Scanning Ranging for Weather-Resistant Environment Perception
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Solution Overview
Problem
Imaging-based environment perception in autonomous driving is susceptible to interference from light scattering and reflection in rough weather conditions, leading to errors in ranging and reconstruction.
Innovation Solution
A method using laser-line scanning imaging, where priori reference images are acquired with a fixed laser-line scanning system and then applied in real scenes, performing fusion calculations to extract distance information and reduce interference from weather conditions, utilizing a rotating galvanometer and high-speed camera for fast scanning and image acquisition.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If imaging-based environment perception is used, then large amount of information is obtained and costs are reduced, but ranging accuracy deteriorates due to light scattering and reflection interference in rough weather
Solution Approach 1:
The patent changes the light source parameter from ordinary light to laser line, and changes the detection parameter to near-infrared band imaging. This parameter transformation enables the system to maintain high information quantity while improving ranging accuracy by reducing sensitivity to weather interference.
Solution Approach 2:
The patent introduces a laser line as an intermediary active light source that projects structured light patterns. This intermediary enables the system to actively illuminate the scene with controlled light, allowing the camera to capture depth information through structured light deformation rather than relying on passive ambient light, thereby improving ranging accuracy without sacrificing information quantity.
2Reliability
If laser-line scanning imaging is used, then weather interference is suppressed, but device complexity increases due to rotating galvanometer and high-speed camera requirements
Solution Approach 1:
The patent makes the laser line scanning system multi-functional by integrating the laser projector, galvanometer scanner, and near-infrared camera into a single unified device. This multi-functional design achieves weather-resistant reliable operation while controlling overall device complexity through functional integration rather than separate components.
Solution Approach 2:
The patent employs dynamic scanning through the rotating galvanometer to project laser lines at different angles rapidly. This dynamic scanning mechanism enables the system to capture 3D environment information in real-time, improving reliability for autonomous navigation while managing complexity through efficient temporal-multiplexed scanning rather than multiple static sensors.
3Productivity
If fast line laser scanning is implemented, then real-time environment perception is achieved, but energy consumption increases
Solution Approach 1:
The patent implements periodic scanning using the rotating galvanometer to project laser lines at different angles in a cyclic manner. This periodic scanning action achieves real-time environment perception by systematically sampling the 3D space over time, improving productivity through efficient temporal sampling while managing energy consumption through duty-cycled operation rather than continuous full-power scanning.
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 effectively suppresses the impact of extreme weather on imaging, enabling accurate and real-time environment perception with reduced costs by using line lasers and structured light imaging algorithms for scene reconstruction.
Implementation Method 1
projecting line laser beams to the whiteboards
Implementation Method 2
acquiring the reference images by using a camera
Implementation Method 3
susceptible to interference caused by light scattering and reflection under rainy, foggy and other rough weather conditions
Implementation Method 4
performing fusion calculation on the acquired scanning image in the real scene and the priori reference images by using a ranging algorithm based on laser-line scanning, and extracting distance information
Data Source
AI summary
The present invention provides a ranging method based on laser-line scanning imaging to effectively suppress interference of extreme weather on imaging. The method includes the following steps: acquiring priori reference images for a fixed laser-line scanning system, including respectively placing reference whiteboards at different distances, projecting line laser beams to the whiteboards, and acquiring the reference images by using a camera; placing a laser-line scanning device in a real scene, causing the laser-line scanning device to respectively emit line lasers at different angles, and acquiring an image at each scanning angle by using a camera; and performing fusion calculation on the acquired scanning image in the real scene and the priori reference images by using a ranging algorithm based on laser-line scanning, and extracting distance information of a surrounding object, to implement environment perception.