How the security camera works

How the security camera works
A security camera is a device used to monitor and protect sites, and its working principle can be simply described as follows:
Camera image acquisition

The security camera converts the optical information in the scene into an electrical signal through a light sensor (such as a CCD or a CMOS) to form an image.

Video signal processing

The camera will preprocess the collected image signals, including denoising, contrast enhancement, etc.

Image compression coding

In order to facilitate transmission and storage, the camera will usually compress and encode the image. Common coding standards include JPEG, H.264, etc.

Video stream transmission

The compressed and encoded video data is transmitted to the monitoring system or storage device in the form of a network protocol (such as TCP / IP). It can be transmitted by wired (such as Ethernet) or wireless (such as Wi-Fi).

Receiving and decoding of the monitoring system

The monitoring system decodes after receiving the video stream, and displays real-time video images on the monitoring center or terminal.

Video storage and playback

Some security cameras support storing video data in local storage devices (such as hard disks, SD cards, etc.), and users can playback and view history at any time.

Alarm and event trigger

The security camera usually supports motion detection, face recognition and other functions. When an abnormal activity or specific event is detected, the alarm can be triggered and the relevant personnel are notified.

It is important to note that how specific security cameras work may vary by brand, model, and application scenario. In addition, in order to protect user privacy and data security, security cameras should also comply with relevant laws and regulations, and take appropriate measures to prevent unauthorized access and data leakage.