How to distinguish surveillance cameras?
Cameras vary according to classification standards, and can be classified according to the following criteria:1) according to the imaging system divisionAccording to the imaging system, the camera can be divided into PAL and NTSC camera system using PAL camera, camera for many countries, such as Germany, Chinese, Singapore and Australia; using NTSC system mainly in the United States, Japan and other countries.2) according to the imaging device DivisionAccording to the imaging device, the camera can be divided into CMOS camera, CCD camera, DPS camera.CMOS (Complementary Metal-Oxide Semiconductor, complementary metal oxide semiconductor) camera is characterized by low price, low power consumption, fault is a short life, poor sensitivity, easy to noise, for some early video cameras, HD video camera is based on CMOS.
Analog camera (Camera) is a front-end device for monitoring the scene image. It takes CCD image sensor as the core component, plus synchronous signal generation circuit, video signal processing circuit and power supply. In recent years, low cost CMOS image sensor has a rapid development, based on the visual telephone or video conference system camera CMOS image sensor was applied to the requirement of image quality is not high. Due to the resolution and low illumination of the CMOS image sensor, the main target is not as good as the CCD image sensor at the moment, so the video camera is still used as a CCD camera in the TV monitoring system. Analog cameras (Camera) output signals are video signals, and can only transmit one-way video signals, which need to be connected to monitors or hard disk recorders for surveillance and video recording.
In addition to the traditional network camera camera all the image capture function, the machine is built-in digital compression controller and a WEB based operating system (including Web server, FTP server, etc.) makes the compressed video data encryption, through the network (LAN, Internet or wireless network) sent to the user terminal to the network. The camera to access remote users can use standard PC on their web browser or client software, real-time monitoring of the target site, and the image data stored in real-time, also can through the network to control the PTZ and camera lens, omni-directional monitoring. Some network cameras also have other functions, such as voice intercom, alarm input, relay output, mobile detection, analog video output and SD card local storage video data and other functions. The formula is represented as follows: IP, Camera=, single path DVS+Camera.
Camera (IP) is based on analog camera (Camera), which integrates video compression and network transmission processing module (DVS), and has the technical characteristics of analog camera and video server. The network camera can run independently as long as it is placed in any site with IP network interface.
