Vehicle Camera Exposure Control for Moving Plate Recognition
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Solution Overview
Problem
Vehicle camera devices struggle to capture clear images of moving vehicles due to inadequate brightness and blurriness caused by using a constant exposure value, making it difficult to recognize vehicle plates in dynamic scenes.
Innovation Solution
A vehicle camera device with a vehicle distance sensor, camera module, and image analysis unit that selects an optimized exposure parameter function based on vehicle speed, distance, and afterimage motion amount to determine an optimized parameter value, adjusting exposure settings such as shutter and light-sensing parameters to improve image clarity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a constant exposure value is used to capture images, then the device complexity is reduced and operation is simplified, but the image brightness becomes inadequate and moving vehicles appear blurred in dynamic scenes
Solution Approach 1:
The patent implements dynamic exposure parameter adjustment by selecting different exposure parameter functions based on detected motion conditions. The system transitions from static constant exposure values to dynamic adaptive exposure values that change according to scene motion characteristics, thereby resolving the contradiction between operational simplicity and image reliability in dynamic conditions.
Solution Approach 2:
The patent changes exposure parameters (shutter speed, aperture, ISO) based on detected motion conditions and selected exposure parameter functions. By dynamically adjusting these parameters according to scene requirements, the system maintains operational simplicity while improving image clarity and reducing motion blur in dynamic scenes.
2Device complexity
If a constant exposure value is used, then the device structure remains simple, but information of vehicle plates cannot be recognized due to inadequate brightness
Solution Approach 1:
The system dynamically adjusts exposure parameters based on motion detection results, selecting appropriate exposure parameter functions to ensure adequate brightness for vehicle plate recognition in dynamic scenes without requiring complex additional hardware structures.
Solution Approach 2:
The patent implements a feedback mechanism where motion detection results inform exposure parameter selection. The system detects motion in the scene, selects an appropriate exposure parameter function based on motion characteristics, and adjusts exposure accordingly, creating a closed-loop control that prevents information loss while maintaining structural simplicity.
3Reliability
If exposure parameters are dynamically adjusted based on motion detection, then image clarity of moving vehicles is improved, but the device complexity increases due to additional sensors and processing requirements
Solution Approach 1:
The patent makes the existing image sensor serve multiple functions: both capturing images for display/recording and detecting motion for exposure control. By reusing the same sensor for dual purposes, the system achieves dynamic exposure adjustment without adding separate motion detection hardware, thereby improving image clarity while minimizing increases in device complexity.
Solution Approach 2:
The system uses its own image sensor to perform self-diagnosis of motion conditions in the captured scene, which then informs its own exposure parameter adjustments. This self-service approach allows the camera to adapt to dynamic conditions using its existing resources, improving image reliability without requiring external complex control systems.
4Adaptability or versatility
If multiple exposure parameter functions are maintained for different motion conditions, then adaptability to dynamic scenes is improved, but the loss of time for selecting appropriate functions occurs
Solution Approach 1:
The patent pre-establishes multiple exposure parameter functions corresponding to different motion condition ranges before actual operation. During runtime, the system only needs to detect motion and select from pre-prepared functions rather than calculating optimal parameters in real-time, significantly reducing selection time while maintaining high adaptability to various dynamic scenes.
Solution Approach 2:
The patent segments the continuous range of motion conditions into discrete ranges, each associated with a specific exposure parameter function. This segmentation allows the system to quickly determine which function to use based on detected motion magnitude, enabling rapid adaptation without complex real-time optimization calculations, thus reducing time loss while maintaining versatility.
Data Source
AI summary
A vehicle camera device is suitable to be provided in a first vehicle. The vehicle camera device receives at least one of a vehicle speed value of the first vehicle, a distance value between the first vehicle and a second vehicle, and an afterimage motion amount of an image of the second vehicle, and selects one of a plurality of exposure parameter functions according to at least one of the vehicle speed value of the first vehicle, the distance value and the afterimage motion amount to determine an optimized parameter value.