Map Information System Traffic Signal Certainty Evaluation
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Solution Overview
Problem
Low-quality traffic signal map information can decrease the accuracy of driving support control systems, which rely on the accuracy of traffic signal positions and indications for safe and efficient vehicle navigation.
Innovation Solution
A map information system that associates traffic signal map information with an evaluation value indicating its certainty, using camera image information and vehicle behavior data to set and update these values, ensuring the quality and reliability of the map information used for driving support control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If traffic signal map information is used for driving support control, then driving support functionality is provided, but accuracy of control decreases when low-quality map information is used
Solution Approach 1:
The patent applies local quality by assigning different evaluation values to different traffic signal map information entries based on their individual quality characteristics. Each map information entry is evaluated independently using multiple criteria (signal indication recognition, vehicle behavior consistency, etc.) and assigned a specific evaluation value that reflects its quality, allowing the system to selectively use high-quality information while filtering out low-quality information.
Solution Approach 2:
The patent introduces a new parameter - evaluation value - to quantify and differentiate the quality of traffic signal map information. This parameter changes the state of map information from a binary existence to a graded quality spectrum, enabling the system to adjust its behavior based on the quality level of the information being used.
2Reliability
If evaluation value is assigned to traffic signal map information, then quality and usefulness of map information is increased, but system complexity increases
Solution Approach 1:
The system performs self-service by automatically evaluating and assigning evaluation values to map information entries without requiring external manual verification. The evaluation process uses the vehicle's own sensors (camera, position sensors, state sensors) to independently verify the quality of map information and update evaluation values, eliminating the need for complex external quality control systems.
Solution Approach 2:
The patent implements feedback mechanisms where the system continuously monitors vehicle behavior and signal indication recognition results, then uses this feedback to update evaluation values of map information entries. This closed-loop feedback allows the system to automatically improve the quality assessment accuracy over time without requiring complex manual intervention.
3Measurement precision
If multiple criteria are used to evaluate map information quality, then accuracy of evaluation value is increased, but processing time increases
Solution Approach 1:
The system performs preliminary action by pre-establishing multiple evaluation criteria and their corresponding verification methods before actual map information usage. The evaluation framework is prepared in advance with defined procedures for checking signal indication recognition, vehicle behavior consistency, and other quality parameters, allowing rapid execution during actual operation without time-consuming on-the-spot decisions.
Solution Approach 2:
The patent applies partial action by selectively applying different numbers and types of evaluation criteria depending on the specific context and available data. The system can use a subset of evaluation criteria when certain conditions are met, avoiding the need to always perform the full comprehensive evaluation, thus reducing processing time while maintaining sufficient accuracy.
Data Source
AI summary
A map information system includes a database management device that manages a map database used for driving support control of a vehicle. The map database includes traffic signal map information that indicates a position of a traffic signal. The traffic signal map information is associated with an evaluation value indicating certainty of the traffic signal map information for each traffic signal. The database management device recognizes a signal indication of the traffic signal at a verification position, based on camera image information indicating an image around the vehicle. The database management device recognizes behavior of the vehicle with respect to the verification position, based on vehicle state information and vehicle position information. Then, the database management device sets the evaluation value regarding the traffic signal at the verification position according to whether or not the behavior of the vehicle is consistent with the signal indication.