What Does Motion Detection Mean in a Dash Cam?

[HenryLee]

Motion detection in a dash cam refers to the feature where the device automatically starts recording only when there is movement within its field of view, otherwise it stops 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 processed and compared by the CPU using a specific algorithm. When there is a change in the scene, such as a person walking by or the camera being moved, the calculated comparison result exceeds a threshold, prompting the system to automatically take appropriate action. Application of Motion Detection: The motion detection function in dash cams is commonly used for parking surveillance, effectively preventing incidents like scratches. However, since motion detection requires power consumption, it usually requires a separate power source.