What surveillance cameras are there now? What kind of surveillance cameras do you usually use at home?

Hikvision is more suitable for home cameras.

①? At present, there are analog cameras, digital cameras and coaxial HD cameras. The advantage of digital cameras is high definition, while the price of analog cameras is low and stable. Coaxial HD camera is an upgraded version of analog camera, and its image quality is much higher than that of analog camera.

②? Because the network camera transmits through the network cable, the network delay is less than one second, while the coaxial camera and analog camera do not.

③? According to the imaging color, there are color and black and white. The information content of color camera is ten times that of black and white.

④? In addition, CCD cameras can be divided into PAL system and NTSC system, and can also be divided according to the image signal processing mode or camera structure.

References:

Resolution is a parameter used to measure the amount of data in bitmap images, usually expressed in dpi (dots per inch). Simply put, the resolution of the camera refers to the ability of the camera to analyze images, that is, the number of pixels of the camera's image sensor. The highest resolution refers to the size of the camera's ability to distinguish images at the highest level, that is, the maximum number of pixels of the camera. At present, the resolution of 300,000 pixel CMOS on the market is 640×480, and that of 500,000 pixel CMOS is 800×600. The two digits of the resolution represent the point units of the length and width of the picture. The aspect ratio of digital pictures is usually 4: 3.

Webcam generally has the basic functions of video shooting/transmission and still image shooting. After the lens captures the image, the image is processed by the photosensitive element circuit and control element in the camera and converted into a digital signal that can be recognized by the computer, and then input into the computer through the parallel port or USB connection, and then the image is restored by software.

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