The application of USB camera modules in vehicle imaging is mainly reflected in the following aspects:
Expand the real-time image monitoring function
Based on the GPS vehicle-mounted terminal, by extending the USB HOST interface to connect the USB camera module, real-time image monitoring of the inside and outside of the vehicle can be achieved. The taxi is equipped with a hemispherical USB camera on the roof in front of the passenger seat, which can comprehensively monitor the situation inside the vehicle. Long-distance buses are equipped with a camera at the front and a camera in the middle, which can cover the key areas of the compartment. This modular design utilizes the existing GPS system resources to achieve the wireless image monitoring function at a lower cost, significantly enhancing the security and reliability of the vehicle management system.
Optimize the performance of image acquisition and transmission
The USB camera module adopts a highly sensitive image sensor and image processing chip, automatically compensating for the light source through an infrared LED matrix at night or in low-light conditions. The module supports real-time transmission at 15 frames per second at VGA resolution (640×480), up to 30 frames per second in CIF (352×288) and SIF (320×240) modes, and provides high-definition still image capture function in 640×480 format. This performance configuration can not only meet the requirements of real-time monitoring, but also reduce the data transmission pressure through the standard JPEG compression mode.
Adapt to diverse monitoring working modes
For different monitoring scenarios, the USB camera module supports three working modes: The scheduled transmission mode can automatically upload images at preset intervals (such as every 10 seconds); The command response mode acquires the monitoring images in real time through instructions from the monitoring center. Event-triggered mode automatically uploads video streams when specific actions such as opening and closing car doors are detected. This flexible working mode design enables the USB camera module to be used not only for routine inspections but also to meet the needs of recording emergencies.
Build a low-cost monitoring solution
By expanding multiple USB HOST interfaces through the USB HUB chip, a single GPS vehicle-mounted terminal can simultaneously connect multiple USB camera modules to form a multi-view monitoring network. The video data can be stored on a USB flash drive via a GPS terminal for easy retrieval and analysis afterwards. This scheme utilizes the 2.5G network to transmit image data. After the popularization of the 3G network, the communication module can be directly upgraded to achieve full real-time video monitoring. This kind of software and hardware co-design makes the total cost of the system significantly lower than that of dedicated on-board monitoring equipment, and is particularly suitable for cost-sensitive operational vehicles such as taxis and logistics vehicles.