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Understanding the True Value of CCTV

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Video Integration Sensors (SENS UP) – Digital enhancement of CCD sensitivity by extending the integration time of the chip in the chip allows shooting even under minimal lighting. Camera sensitivity with this function can be up to 0.00045 Lux in day or night mode. There is the option for กล้องวงจรปิด in this case.

IR illumination

Camera scanning under extremely low light is also addressed by infrared illumination of the camera. As a rule, the IR diodes are integrated into the camera housing and automatically switch on after dark. Such equipped cameras have a sensitivity of 0 Lux; they are capable of shooting even in total darkness. However, the range of the camera is limited by the IR diode afterglow, which is from 3 to 40m depending on the camera type. With IR illumination, cameras are produced with bicolour, with the possibility of IR colour illumination to be distorted in the dark. Additional cameras can be added with additional IR illumination. These reflectors can be either with IR LEDs or with halogen reflectors with IR filter, which have longer afterglow, but much higher consumption and less life. Some cameras are not sensitive to IR illumination most ultraviolet cameras, so it is advisable to consult with our technicians used camera types.

Lenses

Choosing a lens plays an important role in selecting a suitable security camera. With a high-quality lens, you will get the maximum from your camera. Optional accessories of most security cameras are used in the lens. Security camera lenses are especially important for high-quality cameras where poorly selected lenses can degrade image performance.

Security camera lenses are divided into categories: microlenses, fixed with manual iris, fixed with auto iris, varifocal with manual iris, varifocal with auto iris and megapixel lenses.

Transfer of cameras

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The analogue video signal can be transmitted by conventional coaxial cables at a distance of approximately 300m. There are coaxial cables with lower attenuation to allow this distance to be exceeded.

Very often today, video signals are transmitted over twisted pair communication cables, a common UTP Category 5 cable or fibre optics, where significantly higher distances are achieved, with better signal interference resistance hundreds of meters to kilometres. A separate area is the microwave video transmission, which mainly uses frequency bands 2.4, 5.3-5.8, 10.3 and 24GHz.

Camera recording

Nowadays, video camera systems use special digital video recorders (DVRs) that store video on the hard disk (HDD) stored directly in the VCR.

Most video recorders are now equipped with a video server that allows you to view live images and recordings using a web browser or software and configure it fully. An alternative to a video recorder may be a standard PC in which you can add a video card that plugs into a PCI slot and usually has 4 camera inputs, and it is possible to connect multiple cards at once mostly up to 4 cards. In order for this system to function as intended, it is necessary to have special security software installed to set up, store video, operate and configure cameras, this software is part of the purchased card.