Working Principle of Vehicle-Mounted Cameras
1. Working Principle of Vehicle-Mounted Cameras
The camera is powered through the reverse tail light circuit. When the vehicle is shifted into reverse gear, the camera receives power and begins operation. It transmits the captured video data via a wireless transmitter to a wireless receiver installed at the front of the vehicle. The receiver then sends the video signal to the GPS navigation system through an AV IN interface. Upon receiving the signal, regardless of the current operating interface of the GPS device, the LCD screen will prioritize displaying the rearview camera image.
2. Features of Vehicle-Mounted Cameras
I. Image Sensor Chip
CCD and CMOS chips are key components of reversing cameras, classified based on the type of sensor used. CMOS sensors are mainly used in products with lower image quality; their advantages include lower manufacturing costs and power consumption compared to CCD sensors. However, CMOS cameras have higher requirements for lighting conditions. CCD sensors, on the other hand, are high-end technology components commonly used in photography and videography, often accompanied by video capture cards. There are significant differences in technology and performance between CCD and CMOS. Generally speaking, CCD offers better image quality but comes at a higher price. If budget is not a concern, it is recommended to choose a CCD-based camera.
II. Waterproofing
Most reversing camera products come with waterproof functionality to prevent damage from rain and ensure normal performance under various weather conditions.
III. Night Vision
Night vision performance is closely related to the camera’s resolution. Higher-resolution cameras tend to have relatively poorer night vision due to inherent characteristics of the image sensor. However, high-quality products still offer night vision capabilities without significantly compromising image rendering. While color accuracy may be slightly reduced, clarity remains satisfactory.
IV. Resolution
Resolution is one of the most important indicators for evaluating a camera. In general, higher resolution results in better image quality. Currently, cameras with 420 TV lines of resolution have become mainstream in the reversing camera market. Products with 380 TV lines can also be acceptable if properly calibrated. However, depending on the chip grade, photosensitive elements, and the skill level of the technician performing calibration, even cameras using the same chip and grade may produce different image qualities. Conversely, higher resolution often leads to some trade-off in night vision performance.
In summary, when selecting a reversing camera, the above factors should be considered. Most importantly, users should directly view and compare actual image performance to ensure the camera functions optimally.