What does the motion detection of a dash cam mean?
2 Answers
The motion detection of a dash cam means that the dash cam will automatically start recording only when there is object movement within the camera's field of view, otherwise it will stop recording to save storage space. The principle and application of motion detection are as follows: Principle of motion detection: The images captured by the camera at different frame rates are calculated and compared by the CPU according to a certain algorithm. When there is a change in the image, such as someone walking by or the lens being moved, the resulting number from the calculation and comparison will exceed the threshold and instruct the system to automatically take corresponding actions. Application of motion detection: The motion detection function of a dash cam is usually applied to parking surveillance, which can effectively avoid being scratched by others. However, since motion detection requires power consumption, it usually needs to be equipped with a separate power bank.
The motion detection feature of a dashcam means the device only starts recording when it detects movement within the camera's field of view, remaining inactive when the scene is static. I've been using this function for a while now, and it's particularly suitable for parking surveillance, such as when the car is parked on the roadside or in a parking lot. Previously, the dashcam would record continuously, quickly filling up the memory card and wasting power. Now, it only activates recording when someone approaches the car, an animal jumps by, or a vehicle comes near. This saves a significant amount of storage space and extends battery life. Last time my car was scratched by a kid pushing a bicycle, it was the motion detection that automatically captured the footage, directly helping me resolve the dispute. However, it's important to adjust the sensitivity properly—too high, and it might trigger false alarms from small movements like wind blowing leaves; too low, and it could miss important events. It's recommended to find a balanced setting, as it's really convenient and reassuring to use.
