mm represents the number of millimeters of the lens, which is one of the basic parameters of the camera.
Commonly used lenses are generally 3.6MM6MM8MM12MM16MM.
Angle and distance are inversely proportional to the angle of the larger the closer the distance.
3.6mm lens is 67.4 degrees distance 15 meters, 6mm lens is 42.3 degrees distance is 20 meters, 8mm lens is 32.6 degrees distance is 25 meters, 12mm lens is 22.1 degrees distance is 40 meters 16mm lens is 17.1 degrees distance is 60 meters.
Camera (CAMERA or WEBCAM), also known as computer camera, computer eye, electronic eye, etc., is a video input device, is widely used in video conferencing, telemedicine and real-time monitoring.
Ordinary people can also talk and communicate with each other via webcam on the Internet with images and sound. In addition, people can also use it for a variety of popular digital video, audio and video processing.
Expanded Information:
Surveillance Camera Classification:
Surveillance cameras can be categorized into industrial grade and home grade from the difference of usage.
1, industrial-grade surveillance cameras require stable, reliable, in order not to be easily disturbed by the outside world, will try to use wired transmission. Moreover, most of the industrial-grade surveillance cameras are installed outdoors to withstand the wind and sun, so there is a big difference between the appearance and home-grade. In addition, the waterproof function is also essential for industrial-grade cameras.
2, general home-grade surveillance cameras are not so strict, in order not to affect the overall decorative environment, but also for the convenience of installation, to save the trouble of wiring, will try to use the easy to deploy wireless WiFi transmission.
3. The video data captured by the camera every day is not small, and the amount of data accumulated over time is very large.
Industrial-level requirements for each camera to save more than 30 days of data, the need to be equipped with a dedicated hard disk recorder to meet the demand, will greatly increase the complexity of the monitoring system. The data collected by the home camera will be stored to the cloud server through the Internet. This saves storage costs and is also convenient for home users