Balun: It is called balun (English bal ANCED-un balanced transformer lines ) to an impedance matching device that converts transmission lines symmetrical asymmetrical. The reverse is also true: the balun is a reversible device. In the world of CCTV they are used for wiring video with UTP cable instead of coaxial, allowing pass from coaxial to UTP and unlike easily.
BLC (Back Light Compensation): In the security cameras, the BLC is a function that seeks to compensate for backlight situations to prevent the camera dazzles with great intensity of light received and produce an unsatisfactory image.
BNC: This is a type of connector used for coaxial cable terminations. Its name comes from its mechanism tranca type “Bayonet” and its two inventors “Neill” and “Concelman”.
PTZ cameras: Are those security cameras that have functionality motorized horizontal movement (Pan), vertical (Tilt) and ability to increase the image (Zoom).
CCD (Charge-Coupled Device ) is a sensor for capturing images comprising an integrated circuit and a capacitor arrangement. In general, the larger the CCD, the better will be the quality of the captured image.
CIF: Means Common Intermediate Format and refers to the size or resolution of an image in the analog domain. To make the comparison between analog video (NTSC case) and digital, 1CIF (CIF) equals 1/4 of the pixels contained in an image full size of 704×480 pixels, ie 352×240 pixels. There is also the variant 2CIF, which includes all of the pixels in the horizontal dimension of the image (704) but only half of vertical (240) as well as QCIF, which includes only the pixels 1/16 full image (176×120). The higher resolution format is 4CIF (full image) or 704×480 pixels.
D / N (Day and Night): The security cameras have this specification have a light sensitivity of 0.01 lux at least what makes them effective monitoring in places with very low light. Under these conditions, these cameras change their color settings to black and white automatically, achieving a much higher sensitivity to light.
DVR: A digital video recorder (DVR stands for Digital Video Recorder) is an interactive video recording device in digital format.
Frames Per Second (fps): Refers to the number of frames per second which is displayed or recorded video. Conventional TV transmissions are at 30 fps, as this rate is regarded as real -time video.
Infrared (IR): The security cameras have this functionality can capture images even in absolute darkness within a certain range of distance that depends on the number and type of LEDs containing. Commonly they have between 8 and 60 LEDs.
Lux (lx): The derivative unit of the International System of Units for illuminance or lighting level.Equal to one lumen / m². CCTV is used to measure the minimum level of light to which a security camera can capture images satisfactorily. A lower lux, increased sensitivity of the camera to light.
Megapixel: A mega pixel or megapixel (Mpx) is a unit equivalent to 1 million pixels (px). Unlike other units used in the field of computing using the base 2 for their amounts (1.024KB = 1MB, 1.024MB = 1GB, etc.), in this case the base 10 (1.000.000px = 1Mpx) used . This unit is used to express the resolution of digital images, for example, a camera that can take pictures or video with a resolution of 2.048×1.536 pixel is said to have 3.1 megapixel resolution (2048×1536 = 3.145.728px).
MxPEG: System developed by MOBOTIX to compress and store video data with low network load and high image quality. It is based on the H.264 video codec.
Multiplexer: Also known as video mux or quad video, is a device that allows video signals from multiple security cameras are combined to be viewed on a single monitor. Formerly they used to combine all streams of video cameras in a single signal, for example, be able to record on VHS that had a single video input.
NTSC ( National Television System (s) Committee): It is a coding system and transmission of analog color television developed in the United States around 1940, and is used today in most of America and Japan, among others countries. Its specification is 525 lines at 60Hz.
PAL (Phase-Alternating Line) : It is the coding system used in the transmission of analog television signals in color on most of the world. It is used in most countries and African, Asian ,European, plus Australia and some American countries. Its specification is 625 lines at 50Hz.
PoE (Power over Ethernet): It is a technology that allows network equipment such as IP cameras, in addition to data, receive their supply via UTP Ethernet cable.
TVL (TV Lines): This is the unit used to measure the resolution of analog security cameras. The more TVL camera has, the better its resolution.
Varifocal: For security camera lenses, refers to one that permits adjusting the amplitude within a specified range, for example between 2.8 mm. and 12 mm. This translates to vary from high to low amplitude image while lower at higher magnification or zoom.
VGA (Video Graphics Array ): A display standard for computer graphics created in 1987 by IBM. Today many DVR used to be the common output of computer monitors.
Acronyms source: ABBREVIATIONFINDER
In summary, the CCTV or video surveillance systems allows remote viewing of cameras at any time.