ALPR Camera Exposure Control with Synchronized IR Flash
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Solution Overview
Problem
Existing Automatic License Plate Recognition (ALPR) systems face challenges in capturing clear images and videos, especially in varying light conditions, leading to motion blur and inefficient exposure control, which affects the accuracy of license plate recognition.
Innovation Solution
Implementing a method for an ALPR camera with managed exposure control and synchronized infrared flash, where exposure time is automatically adjusted based on ambient light conditions, switching between day and night modes, and using IR flash in night mode to provide clear images and videos.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If exposure time is increased to capture clear images in low light conditions, then image quality improves, but motion blur increases and recognition accuracy deteriorates
Solution Approach 1:
The system dynamically switches between day mode and night mode based on ambient light conditions. In night mode, the camera operates with fixed short exposure time to minimize motion blur while using infrared flash illumination to maintain image quality. This dynamic adaptation resolves the contradiction by selecting the optimal exposure strategy based on real-time lighting conditions.
Solution Approach 2:
The patent introduces an infrared flash as an intermediary light source that illuminates the scene without requiring long exposure times. The synchronized infrared flash provides sufficient illumination for clear images while maintaining short exposure times, thereby preventing motion blur and ensuring recognition accuracy.
2Manufacturing precision
If exposure time is reduced to avoid motion blur, then recognition accuracy improves, but image quality deteriorates in low light conditions
Solution Approach 1:
The system dynamically adjusts its operation mode based on ambient light conditions. In low light conditions (night mode), it uses synchronized infrared flash illumination to maintain image brightness while keeping exposure time short to avoid motion blur. This dynamic switching allows the system to achieve both high recognition accuracy and good image quality.
Solution Approach 2:
The infrared flash acts as an intermediary illumination source that enables short exposure times while maintaining sufficient image brightness. The flash synchronizes with the camera shutter to provide precise illumination, allowing clear images to be captured without motion blur even in dark conditions.
3Ease of operation
If additional light sensors are added to improve exposure control, then exposure management improves, but device complexity increases
Solution Approach 1:
The camera system uses its own built-in light sensor to automatically detect ambient light levels and switch between day and night modes. This self-service approach eliminates the need for additional external light sensors, improving exposure control while avoiding increased hardware complexity.
Solution Approach 2:
The built-in light sensor serves multiple functions: it detects ambient light levels for mode switching, monitors image brightness for exposure adjustment, and triggers the infrared flash in night mode. This multi-functionality reduces the need for separate dedicated components.
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
This approach prioritizes the shortest exposure time to avoid motion blur, maintains clear images in low light conditions, and eliminates the need for additional hardware like external light sensors, resulting in improved accuracy and efficiency for ALPR systems.
Implementation Method 1
automatically setting an exposure control for a camera based on data obtained from the camera
Implementation Method 2
using a synchronized infrared flash for video recording by the camera
Data Source
AI summary
Methods and systems for controlling a camera can involve automatically setting an exposure control for a camera based on data obtained from the camera and using a synchronized infrared flash for video recording by the camera with the exposure control automatically set for the camera. The exposure control can include a managed fixed exposure time controlled with automatic gain correction by the camera. The exposure time for the camera can be fixed. A gain can be monitored, and the exposure time adjusted when an average gain attains a maximum value or a minimum value with changes to ambient light.