Surveillance cameras are mainly divided into several categories.

Classification of surveillance cameras by imaging color (1) Color cameras: Suitable for distinguishing details of scenes, such as clothes or colors of scenes. Because of the color, the amount of information increases, which is generally considered to be 10 times that of black and white cameras. (2) Black-and-white camera: suitable for areas with insufficient light and areas where lighting equipment cannot be installed at night. When only the position or motion of the scene is monitored, a black-and-white camera with a resolution usually higher than that of a color camera can be selected. Band AL stands for black-and-white band AK stands for low-level color classification according to camera resolution (1). The image pixel is about 250,000 pixels, the color resolution is about 330 lines, and the black-and-white resolution is about 420 lines. (2) The number of image pixels is between 250,000 and 380,000, the color resolution is 420 lines, and the black and white resolution is below 500 lines; (3) The image is over 380,000 points, the color resolution is over 480 lines, the black-and-white resolution is over 570 lines, and the high resolution is over 570 lines. According to the camera sensitivity, (1) normal type: illumination required for normal work is 1~3Lux (2) moonlight type: illumination required for normal work is about 0. 1 Lux (3) starlight type: illumination required for normal work is below 0.0 1 Lux (4). According to the CCD target size of the camera element, the target size of (1)l inch is 12.7mmX, 9.6mm high, and the diagonal target size of 16mm(2)2/3 inch is 8.8mmX and 6.6mm high. The dimensions of diagonal11mm (3)1/2 inch target surface are 6.4mmX wide and 4.8mm high, and the dimensions of diagonal 8mm(4) 1/3 inch target surface are 4.8 mm wide and 3.6mm high, and diagonal 6 mm (5)/kloc-0. Diagonal 4mm(6) 1/5 inch is under development, and the official product has not yet been launched. 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. 3G surveillance camera 3G surveillance camera (3G Camera) adopts the latest 3G mobile communication technology, and designs and implements a mobile video surveillance device with simple installation, convenient operation and high cost performance. 3G camera 3G surveillance camera is connected to 3G network through 3G wireless network card (supporting TD-SCDMA, W-CDMA, EVDO). 3G wireless network cards are divided into external and built-in forms. The external 3G modem is connected to the camera through the USB port, which can be flexibly replaced according to the local 3G network standards, while the built-in 3G modem is more stable and reliable, and can be used by simply inserting the SIM card into the 3G camera. 3G camera is different from the traditional IP camera, which not only provides access through the Internet, but also provides a more creative way to monitor the 3G videophone channel. In this way, you can use an ordinary 3G mobile phone without installing software. Just dial a videophone, and the real-time monitoring video of the camera will be presented immediately, making monitoring very simple. The biggest advantage of 3G surveillance cameras is that users are always online. Once there is an alarm, the camera will automatically call back the set 3G mobile phone number, and press an answer key to see the panorama of any situation. Using the audio channel of videophone, 3G camera can also realize the function of on-site monitoring, which is more convenient for you to know the situation of monitoring site. In addition, the functions of camera pan-tilt control, four-level zoom control, remote video recording, mobile phone video browsing, mobile phone anti-disassembly, mobile phone number filtering, access password protection, external sensors and so on make 3G cameras the core of home security. Through 3G dial-up Internet access, 3G cameras can access the Internet, DDNS supports remote Web access and carries out Internet monitoring, and H.264 video coding is adopted. Array monitoring camera Array infrared camera means that the core of infrared lamp is LED IR array LED array means LED array, which is an infrared night vision device with high efficiency and long service life. This is a strategic leader. With the development of LED array to the third generation products, a new generation of array infrared night vision system with far better effect and quality than traditional infrared lamps has been introduced. Its central circular luminous part is smaller than the fingernail, but it emits a lot of light in such a small range. The product adopts aspheric optical glass lens in the light path structure, and the projected light spot is very uniform, which greatly improves the definition of night vision picture and reaches a new stage of face recognition. Different from the traditional LED infrared lamp, the array infrared lamp is characterized by long service life, no obvious attenuation of light within 2-3 years, uniform light, fine picture quality and high definition. The night vision image of the array camera is bright, with less Xue Huadian and no dark angle, which largely solves the flash effect of the picture, can greatly improve the night vision effect of the camera, greatly reduce the volume of digital video files and save the space of hard disk video recorder. The array arrangement of high-performance light-emitting crystals, through special packaging, effectively solves the heat dissipation problem, so that the luminous body is always at normal working temperature and obtains stable power output for a long time.