When did you start hiding cameras?

The earliest camera in the world was invented by Jules Jean Sang in 1874. Color monitoring was born in 1976. Britain was the first country to popularize monitoring in zd, and China first introduced monitoring technology in 1987.

Janssen is a man who travels around for astronomy. 1857, he went to Peru to locate the magnetic equator. 1904, Janssen published an immortal Atlas of the Sun at sunset, which contained 6,000 photos of the circular surface of the sun.

Intelligent monitoring is an embedded video server, which integrates intelligent behavior recognition algorithm, can identify and judge the behavior of people or vehicles in the scene, and generate alarms to remind users under appropriate conditions.

Other cameras:

1, high-speed camera

An optical photographic instrument for recording images of high-speed moving objects. It records the flying posture and events of harmony at a high photography frequency.

2. Aerial camera

A camera mounted on an airplane to vertically photograph the ground for drawing. Use film, mostly 24*24 cm images, and shoot with 150 mm wide-angle lens.

3. stunt camera

A camera equipped with a pause motor can shoot a frame. When shooting fashion, it can move vertically on the animation stage to change the size of the shot image or produce scaling effect.

4. Webcam

Connect a general camera to a switch or router with a network cable, and managers can check the camera situation through a local area network or an intranet.

Above content reference: Baidu Encyclopedia-Monitoring