Vehicle Speed Limit Display Using Road Structure Validation
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Solution Overview
Problem
Conventional maximum speed informing devices may display erroneous maximum speeds due to incorrect recognition of road signs or vehicle position errors, leading to inaccurate speed information being provided to drivers.
Innovation Solution
A maximum speed informing device that captures image data to acquire road structure information, estimates a maximum speed range based on this information, and displays a candidate maximum speed within this range, thereby reducing the likelihood of erroneous speed indications.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the camera device is used to recognize maximum speed from road signs, then the device can provide speed information without relying solely on GPS and map information, but the recognition accuracy deteriorates due to erroneous identification of objects with similar patterns
Solution Approach 1:
The patent introduces road structure information as an intermediary element to verify and filter the maximum speed recognition results. The controller compares the recognized speed against expected speed ranges derived from road structure characteristics (curvature, gradient, lane configuration) to eliminate erroneous recognitions caused by objects with similar patterns.
Solution Approach 2:
The system implements a feedback mechanism where the controller continuously monitors the relationship between road structure information and recognized maximum speeds. When the recognized speed falls outside the expected range based on road structure, the system flags it as potentially erroneous and seeks alternative speed values from map information or adjusts the recognition parameters.
2Reliability
If the device displays maximum speed from map information or estimated values, then it can provide speed information when road signs are not visible, but the accuracy deteriorates due to GPS position errors causing mismatch with actual road
Solution Approach 1:
The patent merges multiple information sources (camera-based road sign recognition, map information, and road structure analysis) into a unified speed determination system. The controller integrates these sources with weighted reliability assessment, where road structure information serves as a verification layer that increases confidence in the selected speed value by cross-referencing multiple independent data streams.
3Speed
If the controller uses only camera-based recognition, then the device can provide real-time speed information, but the reliability deteriorates due to limitations in camera recognition performance under various conditions
Solution Approach 1:
The system performs preliminary analysis of road structure information before finalizing the maximum speed determination. By pre-establishing expected speed ranges based on road geometry and characteristics, the controller creates a validation framework that prepares reference criteria in advance, enabling faster and more reliable verification of camera-based recognition results in real-time operation.
Data Source
AI summary
The maximum speed informing device includes a camera device that acquires image data by capturing a scene in front of the vehicle, a display unit configured to be able to display the maximum speed, and a controller configured to be able to change the maximum speed displayed on the display unit., the controller acquires a numerical value included in the captured scene as a maximum speed candidate based on the image data, acquires road structure information indicating a structure of a road including a lane on which the vehicle is traveling based on the image data, estimates a range of a maximum speed of the road based on the acquired road structure information, and displays the maximum speed candidate within the estimated maximum speed range as the maximum speed on the display unit.