Vehicle Visual Line Detection Automatic Calibration
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Solution Overview
Problem
Conventional visual line detection methods require driver operation and posture changes for calibration, making it complex and inaccurate, especially when the vehicle is in motion.
Innovation Solution
A visual line detection device that dynamically calibrates without driver intervention by using an infrared camera and LED to detect the driver's gaze at a vanishing point, calculating a representative value for accurate detection and updating calibration information.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional calibration method requiring driver operation and posture change is used, then calibration can be executed, but the process becomes complex and cannot readily be executed
Solution Approach 1:
The system performs automatic calibration without requiring driver operation. The determination unit automatically identifies gazing states, and the calculation unit automatically calculates representative values for calibration, eliminating the need for manual switch pressing and marker gazing operations.
Solution Approach 2:
The system performs calibration in advance during automatically detected gazing states before actual visual line detection is needed. By pre-calibrating the detection device during natural gazing moments, the system prepares accurate calibration data without requiring driver intervention at detection time.
2Ease of manufacture
If calibration is executed with driver posture change to push switch, then calibration can be performed, but the posture differs from normal driving posture reducing detection accuracy
Solution Approach 1:
The system dynamically adapts calibration to the driver's natural gazing state during normal driving posture. Instead of requiring a fixed calibration posture, the determination unit identifies when the driver naturally gazes at the marker during normal driving, and calibration is performed in that dynamic state, matching actual detection conditions.
Solution Approach 2:
The system changes the calibration approach from fixed-posture calibration to variable-posture calibration based on detected gazing states. The calculation unit calculates representative values based on detection results during naturally occurring gazing states, adapting calibration parameters to match actual driving conditions rather than requiring a predetermined posture.
3Loss of information
If manual calibration with marker gazing is used, then calibration data can be acquired, but the process requires multiple steps and cannot readily be executed
Solution Approach 1:
The system continuously monitors driver gazing state and performs calibration automatically when gazing conditions are met, without interrupting normal driving. The determination unit continuously detects gazing states, and the calculation unit continuously updates calibration data, maintaining continuous useful action rather than requiring discrete manual calibration steps.
Solution Approach 2:
The system replaces manual mechanical calibration operations (switch pressing, deliberate marker gazing) with automatic optical detection. The detection unit automatically detects gazing states through infrared imaging, and the calculation unit automatically processes this data for calibration, substituting mechanical driver actions with automated sensor-based detection and processing.
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
Enables simple and highly accurate visual line detection in a running vehicle, maintaining accuracy without requiring driver operation or posture changes.
Implementation Method 1
an infrared camera 13a and an infrared LED 13b
Implementation Method 2
an infrared camera 13a and an infrared LED 13b are provided
Data Source
AI summary
A visual line detection device according to an embodiment includes a detection unit, an acquisition unit, a determination unit, a calculation unit, and a calibration unit. The detection unit detects a visual line direction of a driver in a vehicle. The acquisition unit acquires a running state of the vehicle. The determination unit determines whether or not the running state acquired by the acquisition unit is a gazing state where the driver is gazing at a particular position. The calculation unit calculates a representative value for a detection result of the detection unit in a case where the determination unit determines that the running state is the gazing state. The calibration unit executes calibration for detection of the visual line direction by the detection unit in such a manner that the representative value calculated by the calculation unit is a reference thereof.