Top Technical Dictionary

Technical Dictionary


ePoE - a standard for data and power transmission over UTP and coaxial cable

Data and power transmission at the distance of up to 800 m; introduced by Dahua.

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Field of view

It is an angle of view of the camera expressed in degrees, depending on the lens and camera type and the focal length of the lens. For lenses used in CCTV cameras, the field of view is horizontal.

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Focal length

Focal length is a distance between an optical focus of an optical system and a cardinal point of the optical system in millimeters and is defined as the lens system ability to focus light. The smaller the focal length, the more the light beams are focused by the optical system.

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Frames per second (frames per second – fps, frame rate)

A frequency with which the device displays individual images (frames) that provide smooth playback of the video.

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H.264 - image coding standard

H.264 – is a hybrid coding standard using innovative and advanced solutions to improve the compression ratio of a video sequence without affecting its quality.

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H.265 - video coding standard

H.265 - video compression standard, also referred to as HEVC (High Efficiency Video Coding) is a successor to H.264/AVC image coding standard.

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HD-CVI - video signal transmission standard

HD-CVI (High Definition Composite Video Interface) - an HD (1280x720), Full HD (1920x1080), 4 Mpx (2560x1440) and 8 Mpx 4K UHD (3840x2160) signal transmission standard via a 75 Ω coaxial cable or twisted pair with video baluns.

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HD-TVI - video signal transmission standard

HD-TVI (High Definition Transport Video Interface) - an HD (1280x720) and Full HD (1920x1080), 3 Mpx (2048x1536), 4 Mpx (2688x1520), 5 Mpx (2560x1944) and 8 Mpx 4K UHD (3840x2160) signal transmission standard via a 75 Ω coaxial cable or twisted pair with video baluns.

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HDCP (High-bandwidth Digital Content Protection) – digital content protection

A control and protection system of digital audio and video transmitted via HDMI or DVI developed by Intel.

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HDMI standard

HDMI (High Definition Multimedia Interface) standard – an interface for data transmission between devices. Since its introduction at the end of 2002, several different standards have been implemented.

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ICR – mechanical infrared cut-off filter

An optical element in form of an adapter designed to block infrared wavelengths. Depending on the operation mode (day or night) a specialised mechanism covers or uncovers the image sensor.

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IK rating

IK rating is a classification for the degrees of protection provided by enclosures for electrical equipment against external mechanical impacts. The higher the IK code, the higher the mechanical strength. The IK rating is an 11-code scale (‘00’ to ‘10’).

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Image resolution - graphical presentation

Mpx (MP, Mpix) is an abbreviation of Megapixel. It is a unit describing in millions the number of elementary points of the CCD matrix. The higher the number means the higher image resolution. See a graphical comparison of different image sizes.

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Image sensor

An image sensor is a photosensitive element converting the image into an electric signal. It uses a photoelectric effect by converting a stream of photons into electric impulses. It is one of the key components of any camera or any device designed for taking photos or recording video sequences.

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IP rating

IP rating also referred to as the degree of protection defines the resistance to external conditions. The first digit denotes a resistance to solid and dust ingress, the second digit denotes a resistance to water ingress.

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IP v4/v6 protocols
Due to a growing shortage of IPv4 addresses, a successor to IPv4, known as IPv6 has been developed. A switch between IPv4 and IPv6 is unnoticeable for an average user. The key to IPv6 enhancement is the expansion of the IP address space from 32 bits to 128 bits. See more...
Iris diaphragm

Iris diaphragm is part of a lens controlling the amount of light reaching the image sensor. It controls the relative aperture of the lens to reduce or increase the amount of light in lenses with adjustable iris (manual iris, auto iris) or is fixed.

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IVS - Intelligent Video Surveillance

Intelligent Video Surveillance (Intelligent Video Surveillance) is a video processing technique detecting events based on pre-defined criteria.

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Light colour

The colour of light depends on the subjective senses, similar to our perception of sound, smell, taste and touch.

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LTE technology

LTE (Long Term Evolution) is a technology that integrates many technical solutions developed by the 3GPP consortium and designed to achieve high data rates. Currently, the uplink rates in the LTE-A (LTE Advanced) can reach up to 1 Gb/s.

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M-JPEG - image coding standard

M-JPEG is an intra-frame compression method with a maximum compression ratio limited to approx. 1:20. The frames are compressed individually and the compression requires less computing power and memory compared to H.264.

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MAC - physical address of a network device

Medium Access Control Address – A unique physical address of each device connected to a computer network, i.e. network adapter, router or IP camera.

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Maximum radio communication range

Maximum transmission range: in actual conditions may be several times smaller than the maximum transmission range in the open areas. Wave attenuation can be affected by many factors.

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Maximum relative ambient humidity (RH – Relative Humidity)

Relative humidity is the amount of water vapour present in a specific volume expressed as a percentage of the amount needed for saturation at the same temperature.

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Minimum temperature

Minimum temperature is a lower limit of operating temperature. It is a minimum guaranteed operating temperature specified by the manufacturer - see the camera test in the climatic test chamber.

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Motion detection

Motion detection is a process of detecting a change in scenery over a predefined threshold value.

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MPEG-4 - image coding standard

MPEG-4 – a standard introduced in 1998 as a replacement for MPEG-1 and MPEG-2. The standard includes several new functions providing flexible quality and compression ratio coding. Codec implementation depends on the programmer decision, and the application capabilities are determined by profiles and levels used.

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MTBF – mean time between failure (Mean Time Between Failure)

It is expressed in hours and indicate the reliability of the device.

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NCQ (Native Command Queuing)

NCQ is a software-based extension of SATA interface in which received read and write commands are queued to improve efficiency (number of I/O per second) of both HDDs and SSDs.

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NTSC - analogue television standard

NTSC (National Television System Committee) – an analogue television standard used in the US, South Asian and Pacific countries.

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OFDM modulation

OFDM – an orthogonal frequency-division multiplexing is a method of encoding digital data on multiple orthogonal carrier frequencies to eliminate the multi-path propagation and intersymbol interferences.

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Optical waveguide types

An optical waveguide is a physical structure guiding the electromagnetic waves in the optical spectrum. The optical waveguides are made of highly symmetrical dielectrics including a light-propagating core surrounded by a dielectric material (jacket) with a refractive index n lower than the core.

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Optical wavelength
The optical radiation is presented as an electromagnetic wave. Waves of all lengths compose the radiation spectrum, and the dedicated lengths form the range. In other words, the wavelength is a distance between two repeating wave elements. See more...
OSD menu

(Menu On-Screen-Display) – an on-screen menu displayed after pressing a menu button.

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PAL - analogue television standard

PAL (Phase Alternating Line) – an analogue television video broadcast system. The system was created as an improvement of NTSC standard for use in Europe, Africa and several Asian countries.

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Peak-to-peak voltage Vpp

Vpp (peak-to-peak voltage) is a peak-to-peak voltage. A parameter measured between the maximum signal amplitude value and its minimum value over a single period.

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Pelco-D, Pelco-P

Pelco-D/P are two, relatively similar communication protocols for motorized CCTV cameras.

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PET

PET - Polyethylene terephthalate is a semi-crystalline, high-strength and high-ductility polymer with excellent machinability and UV resistance properties, good electrical insulation and sound attenuation properties.

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Physical expansion

Production technology of the coaxial cable insulation

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