Lidar Object Recognition Correction for Headlight Interference
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Solution Overview
Problem
Laser radar systems struggle to accurately measure object sizes due to high-illuminance interference, such as vehicle headlights, leading to incomplete recognition regions and smaller-than-actual object size estimations.
Innovation Solution
An object recognition apparatus with a light-emitting unit, light-receiving unit, distance calculation unit, direction estimation unit, and correction unit that identifies high-illuminance directions and corrects the recognition region to include these areas, ensuring accurate object size estimation by adjusting the recognition region based on positional relationships with high-illuminance directions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If laser radar is used to measure distances to object surfaces, then distance measurement points can be acquired for object recognition, but distance measurement points cannot be acquired from directions with high-illuminance interference light such as vehicle headlights
Solution Approach 1:
The system performs preliminary acquisition of high-illuminance direction information before object recognition. The light-receiving unit measures light intensity from all directions in advance, identifies high-illuminance directions, and stores this information for subsequent correction of the recognition region, preventing information loss in these directions
Solution Approach 2:
The system uses feedback by continuously monitoring light intensity in various directions and using this information to dynamically adjust and correct the object recognition region. The measured light intensity values feed back into the recognition process to compensate for missing distance measurement points
2Reliability
If laser radar avoids high-illuminance directions to prevent interference, then measurement accuracy in those directions improves, but the recognition region becomes incomplete and object size is underestimated
Solution Approach 1:
The system introduces an intermediary correction mechanism that uses light intensity information as a mediator to bridge the gap between reliable measurement directions and incomplete recognition regions. This intermediary information allows the system to expand the recognition region into high-illuminance directions without compromising measurement reliability
Solution Approach 2:
The system adds a new dimension to the recognition process by incorporating light intensity measurements as an additional parameter. This dimensional expansion allows the system to compensate for missing spatial information in high-illuminance directions, transforming a 2D distance measurement problem into a 3D solution space that includes intensity data
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
The apparatus effectively reduces the impact of high-illuminance interference, ensuring accurate object recognition and preventing underestimation of object sizes by incorporating high-illuminance directions into the recognition region, thus enhancing accuracy and reliability.
Implementation Method 1
a light-emitting unit for emitting laser light, and a light-receiving unit for receiving reflected waves, the reflected waves being based on reflection of the laser light from corresponding distance measurement points of an object to be recognized
Data Source
AI summary
In an object recognition unit, a high-illuminance direction acquisition unit acquires, as a high-illuminance direction range, a range of at least one high-illuminance direction. The at least one high-illuminance direction is a direction in which an intensity of light received by a light-receiving unit when reflected waves are not being received by the light-receiving unit is equal to or greater than a predetermined threshold value. A correction unit corrects a recognition region of an object such that, as viewed from a vehicle, a corrected recognition region of the object includes at least part of the high-illuminance direction range on condition that the recognition region of the object and the high-illuminance direction range have a predetermined positional relationship therebetween.