A dashcam, dash camera, dashboard camera or car camera is an onboard camera that continuously records the view through a vehicle’s windscreen. It may be attached to the interior windscreen or to the top of the dashboard, by suction cup or adhesive-tape mount. Dash cameras may provide video evidence in the event of an accident.
Dash Camera Functions
A dash cam camera differs from other cameras by the fact that it has to be an independent witness, require minimum attention, letting the driver concentrate on driving
typical dash camera properties in general (resolution, frame rate, focus distance, aperture) and how these are set, varied are optimised for the purpose;
resolution and optics quality are important for visibility of details such as number plates. As of 2016 the minimum acceptable quality would be 1080p with 4k video being the future.
higher frame rates are important to get the details of an event as this helps capture movement.
focus and aperture settings must be optimum for the situation just outside the car.
hands free start-stop; typically by ignition key or g-force (acceleration) sensors.
easy memory management; typically looping around and erasing the oldest recorded videos that are not marked as important; the stored files will be broken up into 1-3 minute recordings. Recording media is typically an SD (or MicroSD) card of a reasonable quality and capacity (might restrict looping time; depending on resolution 32gb gives around 2 hours of recording time to loop around). Some dash cameras may let the user lower the recording resolution, so the rest of the trip is less likely to overwrite things earlier that the user deems important.
registering and logging GPS position (and thus speed), date and time on to the video.