Vehicle Camera Visibility Detection With Dynamic Sampling Period
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Solution Overview
Problem
Existing systems struggle to quickly determine whether the field of view of a vehicle-mounted camera is in a poor visibility state, which hinders autonomous driving control and driving assist.
Innovation Solution
A poor visibility determination device that adjusts the determination period based on the operation status of visibility ensuring devices like headlights and wipers to rapidly identify poor visibility conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If a fixed determination period is used for poor visibility detection, then the detection process is simple, but the detection time cannot be optimized based on visibility conditions
Solution Approach 1:
The determination period is made dynamic rather than fixed. The control unit adjusts the determination period length based on the operation state of visibility ensuring devices (wiper, headlight). When these devices are operating, indicating poor visibility conditions, the determination period is set to a shorter length to enable faster detection. This dynamic adjustment resolves the contradiction by allowing rapid detection during critical periods while maintaining simple operation during normal conditions.
Solution Approach 2:
The determination period parameter is changed based on the operation state of visibility ensuring devices. The control unit selects between a first determination period (when wiper/headlight are operating) and a second determination period (when they are not operating). This parameter change approach allows the system to optimize detection time according to actual visibility conditions without requiring complex continuous adjustment mechanisms.
2Speed
If the determination period is shortened to reduce detection time, then responsiveness improves, but detection accuracy may deteriorate due to insufficient sampling
Solution Approach 1:
The determination period dynamically adapts to visibility conditions. During poor visibility (wiper/headlight operating), a shorter first determination period enables rapid detection response. During normal visibility, a longer second determination period provides sufficient sampling for accurate detection. This dynamic period adjustment resolves the contradiction by matching the sampling duration to the actual detection needs of each visibility condition.
Solution Approach 2:
The system performs preliminary assessment by checking the operation state of visibility ensuring devices before setting the determination period. This preliminary action allows the system to pre-select an appropriate determination period length that balances speed and accuracy for the current visibility condition, avoiding the need for trial-and-error detection.
3Measurement precision
If the determination period is extended to improve detection accuracy, then more images can be analyzed, but the response time to poor visibility conditions increases
Solution Approach 1:
The determination period parameter is changed based on the operation state of visibility ensuring devices. When wiper or headlight is operating (indicating poor visibility), the system switches to a shorter first determination period for rapid detection. When these devices are not operating, a longer second determination period is used for thorough analysis. This parameter change strategy resolves the contradiction by adapting the detection period to the urgency indicated by device operation status.
Solution Approach 2:
The system uses feedback from the operation state of visibility ensuring devices to adjust the determination period. The control unit continuously monitors whether wiper or headlight is operating and uses this feedback to select the appropriate determination period length. This feedback mechanism ensures that the determination period always matches the current visibility conditions, optimizing both speed and accuracy.
Data Source
AI summary
The poor visibility determination device includes a processor configured to determine whether or not a field of view in an imaging area of a camera that is mounted on a vehicle and captures surroundings of the vehicle is in a poor visibility state based on a plurality of images generated within a predetermined determination period by the camera, and set the determination period so that a length of the determination period when at least one visibility ensuring device for ensuring visibility of the field of view of the camera is operating is shorter than the length of the determination period when the visibility ensuring device is not operating.