Camera knowledge

Automatic gain control

The video signal output by the camera must reach the standard level specified by the TV transmission, that is, in order to be able to output a standard video signal under different scene illumination conditions, the gain of the amplifier must be adjusted in a large range. This gain adjustment is usually done automatically by detecting the average level of the video signal. The circuit that implements this function is called an automatic gain control circuit, or AGC circuit for short. The sensitivity of the camera with AGC function will be improved at low illumination, but the noise at this time will also be more obvious. This is because the signal and noise are amplified simultaneously.

Automatically track high-speed ball

The automatic high-speed tracking dome is a combination of optics, electronics, machinery, information processing and network. It consists of cameras, power transmission, motion control devices, image analysis, recognition, compression and communication based on high-speed parallel processing. With video camera, position control, azimuth and lens preset, moving target detection, identification and tracking, flame and smoke detection alarm and other functions. It can be widely used in security monitoring occasions such as buildings, banks, airports, stations, customs, transportation, power, factories and mines.

Features

When the moving target enters the field of view of the spherical camera, the high-speed DSP chip is used to calculate the difference between the previous image and the current image. When a certain value is reached, a certain part of the frame is determined to be a moving object, and then The dome camera automatically issues instructions to the dome camera head, and so on, so as to control the spherical camera to achieve continuous tracking of moving objects without the need for human operation or computer system support.

Choose the right camera

The camera part is generally installed at the scene, which includes the camera, lens, protective cover, bracket and electric pan / tilt. Its role is to take a picture of the surveillance area and convert it into an electrical signal.

The camera is divided into color and black and white. The general black and white camera is more sensitive than the color and is more suitable for places with insufficient light. If the purpose of use is only to monitor the position and movement of the scene, the black and white camera can be used; For details of camera objects, such as distinguishing the colors of clothes and scenes, it is better to use color.