Vehicle Tracking Device Using Contour Segmentation
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Solution Overview
Problem
Existing vehicle tracking systems face challenges in accurately specifying the advancing direction of a target vehicle, particularly when lateral surface data is included in contour data, leading to deviations from the actual direction and difficulties in appropriate tracking.
Innovation Solution
A vehicle tracking device that estimates a rectangular frame approximating the target vehicle's external shape using past data and adjusts contour data detected by sensors, specifying the advancing direction based on the layout of detection point data relative to a reference side on the host vehicle, thereby optimizing the tracking process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If contour data is used to specify the advancing direction of the target vehicle, then the tracking process can be performed, but the specifying accuracy decreases when lateral surface data is included in the contour data
Solution Approach 1:
The contour data is segmented into multiple pieces, and the advancing direction is specified by selecting and processing specific segments (front surface data or rear surface data) rather than using all contour data points. This segmentation allows the system to exclude lateral surface data that would otherwise degrade accuracy.
Solution Approach 2:
Different regions of the contour data are treated differently based on their location. The system identifies and prioritizes data from the front surface or rear surface of the target vehicle, while excluding or giving less weight to lateral surface data. This local quality approach ensures that only high-quality directional information is used for advancing direction specification.
2Duration of action of moving object
If the advancing direction is specified based on past advancing direction data, then the target vehicle can be tracked over time, but the tracking accuracy decreases when the specified advancing direction deviates from the actual direction
Solution Approach 1:
The system performs preliminary classification of contour data to identify front surface or rear surface data before specifying the advancing direction. This preliminary action ensures that the direction specification is based on accurate data, which then improves the accuracy of position estimation and continuous tracking over time.
3Productivity
If all detection point data in the contour data is used for advancing direction specification, then the data utilization is maximized, but the accuracy decreases due to inclusion of lateral surface data
Solution Approach 1:
The system extracts only the relevant portions of contour data (front surface or rear surface data) that are useful for specifying the advancing direction, while discarding or excluding lateral surface data. This extraction process maintains high data utilization efficiency by using the most valuable data segments while eliminating data that would degrade accuracy.
Data Source
AI summary
Provided is a vehicle tracking device capable of appropriately tracking a vehicle. The vehicle tracking device is a vehicle tracking device that tracks a target vehicle that travels at the periphery of a host vehicle. The vehicle tracking device includes: an estimation unit that estimates a rectangular frame approximating an external shape of the target vehicle on the basis of past data; and a specifying unit that specifies an advancing direction of the target vehicle on the basis of layout of contour data composed of a plurality of pieces of detection point data, which is detected by a sensor that is mounted to the host vehicle and detects a relative position of a detection target with respect to the host vehicle as the detection point data, and indicates a contour of the target vehicle, with respect to a reference side that is a side on the host vehicle side among sides of the rectangular frame along a vehicle width direction of the rectangular frame.