Vehicle Sign Recognition Effective Range Determination
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Solution Overview
Problem
Conventional sign recognition devices fail to correctly determine the effective range of road signs, especially when vehicles turn or deviate from continuous road sections, leading to inaccurate presentation of road signs to drivers.
Innovation Solution
A sign recognition device that includes a sign effective range data recording unit, a sign recognition unit, and a sign effective range determining unit, which uses vehicle information, map information, and stored conditions to determine the start and end points of the effective range of recognized signs, storing recognition results in a buffer and deleting them when the vehicle deviates from the range.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the effective range of road signs is determined by traveled distance or elapsed time, then the device complexity is reduced, but the measurement precision of the effective range determination deteriorates
Solution Approach 1:
The patent applies preliminary action by pre-storing effective range data (number of road sections, distance information) in a database before actual sign recognition occurs. When a sign is recognized, the system retrieves pre-prepared effective range information rather than calculating it in real-time, thus maintaining low device complexity while achieving high measurement precision through accurate pre-stored geographic and road section data.
Solution Approach 2:
The patent introduces map information and road section data as intermediary elements between the sign recognition system and the effective range determination. By using map databases that contain pre-defined road sections and their geometric information, the system can accurately determine effective ranges based on the vehicle's position relative to these intermediaries, rather than relying solely on simple distance or time measurements.
2Ease of operation
If the effective range is determined without considering auxiliary signs and vehicle position, then the ease of operation is improved, but the reliability of sign recognition deteriorates
Solution Approach 1:
The patent applies universality by creating a multi-functional effective range determination system that simultaneously considers multiple factors: main road signs, auxiliary signs, vehicle position, and road section information. The system universally processes all these elements together to determine the effective range, rather than relying on a single simple criterion, thus maintaining ease of operation through automated comprehensive processing while achieving high reliability.
Solution Approach 2:
The patent implements feedback by continuously monitoring vehicle position information and comparing it with the stored effective range data. The system provides feedback loops where recognition results are stored in buffers, and the effective range determination is continuously updated based on current vehicle position and recognized signs, ensuring reliable and accurate sign information presentation to the driver.
3Loss of information
If the vehicle position and road section information are not considered, then the loss of information is reduced, but the measurement precision of effective range determination deteriorates
Solution Approach 1:
The patent applies preliminary action by pre-storing comprehensive road section information, map data, and effective range parameters in a database before actual operation. This pre-prepared information includes road geometry, section boundaries, and sign effective range definitions, allowing the system to retrieve accurate measurement data without real-time calculation while minimizing information loss.
Solution Approach 2:
The patent introduces map information and road section databases as intermediaries that bridge the gap between simple vehicle position data and accurate effective range determination. These intermediary data structures contain pre-processed geographic information that enables precise measurement without requiring the system to store or process all raw geographic data, thus minimizing information loss while maintaining high measurement precision.
Data Source
AI summary
A sign recognition device includes a sign effective range data recording unit for prestoring effective range conditions shown by a sign and an auxiliary sign, a sign recognition unit for recognizing a sign and an auxiliary sign by using a captured image of a roadway in front of a vehicle, a vehicle information acquiring unit for acquiring vehicle information, a map information acquiring unit for acquiring map information about a map of an area surrounding the vehicle, and a sign effective range determining unit for determining whether or not the vehicle is staying in the effective range specified with the sign and the auxiliary sign which have been recognized by the sign recognition unit by using the effective range conditions stored in the sign effective range data recording unit, the vehicle information, and the map information.