Table 3 - CCTV surveillance systems
CLC/TR 50531:2009 -40 -
|
No. |
Term |
Definition |
Ref. publication |
Year |
Ref. |
|
3.14 |
camera housing |
an enclosure to provide physical and/or environmental protection of the camera, lens and ancillary equipment |
EN 50132-7 |
1996 |
3.1.5, B.5 |
|
3.15 |
camera sensitivity |
image device illumination necessary to produce a defined composite (colour) video signal amplitude with a defined signal to noise ratio |
EN 50132-7 |
1996 |
3.1.9, B.6 |
|
3.16 |
CCTV camera |
a unit containing an imaging device producing a video signal from an optical image [EN 50132-7] |
EN 50132-2-1 EN 50132-7 |
1997 1996 |
3.1.8 3.1.3, B.7 |
|
3.17 |
CCTV camera equipment |
a unit containing a CCTV camera plus appropriate lens and necessary ancillary equipment [EN 50132-7] |
EN 50132-2-1 EN 50132-7 |
1997 1996 |
3.1.9 3.1.4, B.8 |
|
3.18 |
CCTV control unit |
equipment for controlling and monitoring the required operational functions of the CCTV system |
EN 50132-7 |
1996 |
3.1.24, B.9 |
|
3.19 |
CCTV surveillance installation |
an installation consisting of the hardware and software components of a CCTV system, fully installed and operational for monitoring a defined security zone |
EN 50132-7 |
1996 |
3.1.2, B.10 |
|
3.20 |
CCTV surveillance system |
a system consisting of camera equipment, monitoring and associated equipment for transmission and controlling purposes, which may be necessary for the surveillance of a defined security zone |
EN 50132-7 CLC/TR 50456 |
1996 2008 |
3.1.2, B.11 2.1.4 |
|
3.21 |
character generator |
a device for generating alpha numeric characters and/or symbols and adding them into the image |
EN 50132-7 |
1996 |
3.1.29, B.13 |
|
3.22 |
Composite Colour Video Signal (CCVS) |
the video output signal of colour camera comprising the burst and colour information (colour) the picture luminance component (video), black reference (blanking) and the synchronisation components (synchronisation) |
EN 50132-7 |
1996 |
3.1.7, B.14 |
|
3.23 |
central CCTV control unit |
a unit for monitoring and controlling a number of local CCTV control units |
EN 50132-7 |
1996 |
B.12 |
|
3.24 |
Composite Video Signal (CVS) |
the picture component (video), black reference (blanking) and the synchronisation components (synchronisation) |
EN 50132-2-1 EN 50132-7 EN 50132-4-1 |
1997 1996 2001 |
3.1.10 3.1.6, B.15 3.1.4 |
|
Table 3 - CCTV surveillance systems (continued) -41- CLC/TR 50531:2009 No. |
Term |
Definition |
Ref. publication |
Year |
Ref. |
|
3.25 |
contrast ratio |
ratio of maximum luminance level of a white area in the picture to the luminance level of a subjective black |
EN 50132-4-1 |
2001 |
3.1.6 |
|
3.26 |
Contrast Transfer Function (CTF) |
the complex function on frequency response relating the output signal of the camera to the spatial frequency of the test chart projected on the imaging device of the camera |
EN 50132-2-1 |
1997 |
3.1.11 |
|
3.27 |
control and interfacing circuits |
circuits in a CCTV monitor enabling the connection of the input video signal and enabling the control of e.g. contrast and brightness of the displayed picture |
EN 50132-4-1 |
2001 |
3.1.5 |
|
3.28 |
dc-restoration |
provision in a monitor to restore the dc-component of the video signal |
EN 50132-4-1 |
2001 |
3.1.7 |
|
3.29 |
depth of focus |
the range of distances from the lens over which the image appears acceptably sharp |
EN 50132-7 |
1996 |
B.16 |
|
3.30 |
electronic iris |
an automatic electronic shutter which varies the camera sensitivity in relation to the varying light conditions in order to maintain the video output signal within defined limits [EN 50132-7] |
EN 50132-2-1 EN 50132-7 |
1997 1996 |
3.1.12 3.1.16, B.17 |
|
3.31 |
electronic shutter |
an arrangement in the camera changing its sensitivity by electronically controlling its exposure |
EN 50132-2-1 EN 50132-7 |
1997 1996 |
3.1.13 3.1.15, B.18 |
|
3.32 |
event recording |
the event controlled recording or storing image signals for a pre-determined time |
EN 50132-7 EN 50131-1 CLC/TS 50131-3 |
1996 2006 2003 |
3.1.36, B.19 3.1.25 3.1.18 |
|
3.33 |
external synchronisation |
a method of feeding reference timing signals to all connected devices to ensure that their video output signals are synchronous |
EN 50132-7 |
1996 |
B.20 |
|
3.34 |
Fixed focal length lens |
a lens with one defined focal length |
EN 50132-7 |
1996 |
B.21 |
|
3.35 |
filter mount |
the attachment point on a lens for mounting an optical filter |
EN 50132-7 |
1996 |
B.22 |
|
3.36 |
flange back distance |
the distance between the surface of the lens mount flange to the focal point |
EN 50132-7 |
1996 |
B.23 |
|
3.37 |
focal length (f) |
a property of a lens, expressed in mm, giving the angle of view for a given sensor size |
EN 50132-7 |
1996 |
3.1.18, B.24 |
Table 3 - CCTV surveillance systems (continued)
CLC/TR 50531:2009 -42 -
|
No. |
Term |
Definition |
Ref. publication |
Year |
Ref. |
|
3.38 |
focusing mechanism of the lens |
a mechanism on the lens enabling correct focus of objects at various distances from the lens |
EN 50132-7 |
1996 |
B.25 |
|
3.39 |
gamma correction |
non-linear signal processing that establish correct grey scale reproduction on the picture tube |
EN 50132-2-1 |
1997 |
3.1.14 |
|
3.40 |
geometric distortion |
aberration that causes the reproduced picture to be geometrically dissimilar to the original scene |
EN 50132-4-1 |
2001 |
3.1.8 |
|
3.41 |
grey scale |
dynamic range of luminance intensity available from the display device |
EN 50132-4-1 |
2001 |
3.1.9 |
|
3.42 |
horizontal resolution |
measure of the ability of the monitor to resolve picture detail in the line direction |
EN 50132-4-1 |
2001 |
3.1.10 |
|
3.43 |
image sensor size |
the size of the light sensitive surface of the imaging device. The value is expressed in inches and refers to the diameter of the glass tube from which the camera tubes were constructed [EN 50132-7] NOTE Some examples of sizes are: -1-inch for 12,8 x 9,6 mm (16 mm diagonal);
|
EN 50132-2-1 EN 50132-7 |
1997 1996 |
3.1.17 3.1.12, B.28 |
|
3.44 |
imaging device |
a device that converts an optical image into an electrical signal |
EN 50132-2-1 EN 50132-7 |
1997 1996 |
3.1.15 3.1.11, B.26 |
|
3.45 |
imaging device illumination |
the level of illumination (illuminance) at the photosensitive surface of the imaging device |
EN 50132-2-1 EN 50132-7 |
1997 1996 |
3.1.16 3.1.10, B.27 |
|
3.46 |
interlace |
positioning of the scan lines of alternate fields so that the even field lines are vertically spaced between the odd field lines |
EN 50132-4-1 |
2001 |
3.1.11 |
|
3.47 |
iris |
a variable aperture mechanism which regulates the amount of light passing through the lens onto imaging device of the CCTV camera |
EN 50132-7 |
1996 |
3.1.23, B.29 |
|
3.48 |
lens |
an optical device for projecting an image of a desired scene onto the photo sensitive surfaces of the imaging device |
EN 50132-2-1 EN 50132-7 |
1997 1996 |
3.1.18 3.1.17, B.30 |
Table 3 - CCTV surveillance systems (continued)
-43- CLC/TR 50531:2009
|
No. |
Term |
Definition |
Ref. publication |
Year |
Ref. |
|
3.49 |
lens mount |
the mechanical interface between the lens and the camera |
EN 50132-7 |
1996 |
B.31 |
|
3.50 |
local CCTV control unit |
a unit for controlling and/or monitoring part of the overall CCTV system |
EN 50132-7 |
1996 |
B.32 |
|
3.51 |
low frequency response |
ability of a monitor to display large areas of uniform luminance accurately in the field direction |
EN 50132-4-1 |
2001 |
3.1.12 |
|
3.52 |
manual iris |
a mechanism for manually adjusting the iris of the lens |
EN 50132-7 |
1996 |
B.33 |
|
3.53 |
motorised iris |
a motor driven mechanism on the lens for adjusting the iris |
EN 50132-7 |
1996 |
B.35 |
|
3.54 |
mid frequency response |
ability of a monitor to display large areas of uniform luminance accurately in the line direction |
EN 50132-4-1 |
2001 |
3.1.13 |
|
3.55 |
modulation transfer function |
contrast at which a high frequency burst can be reproduced on the monitor screen |
EN 50132-4-1 |
2001 |
3.1.14 |
|
3.56 |
monitor size |
diagonal of the physical tube size, e.g. a 23 cm (9-inch), a 31 cm (12-inch) monitor |
EN 50132-4-1 |
2001 |
3.1.15 |
|
3.57 |
mutual interference |
phenomenon, sometimes visible on the monitor screen, when two or more monitors operating on different non synchronized signals are stacked or placed side by side |
EN 50132-4-1 |
2001 |
3.1.16 |
|
3.58 |
nd-filter iris |
an iris whose segments include neutral density filters with graded density for further reducing the optical transmission of the lens beyond that achievable by normal closing of the iris |
EN 50132-7 |
1996 |
B.36 |
|
3.59 |
optical filter |
a device that modifies specific optical properties of the light passing through it (e.g. spectral properties, image quality properties) |
EN 50132-7 |
1996 |
B.37 |
|
3.60 |
optical focus |
the position of the focusing mechanism of a lens that gives the sharpest image of the desired object |
EN 50132-7 |
1996 |
B.38 |
|
3.61 |
pan and tilt unit |
a motorised unit permitting the vertical and horizontal positioning of the camera equipment |
EN 50132-7 |
1996 |
3.1.27, B.39 |
|
3.62 |
physical transmission path |
combination of the transmission medium and necessary amplifiers and other equipment to form a transmission path with one or more transmission channels |
EN 50132-5 |
2001 |
3.1.1 |
|
3.63 |
picture signal |
the part of the composite video signal contains the picture information |
EN 50132-2-1 |
1997 |
3.1.19 |
|
3.64 |
picture storage |
the storing of video images |
EN 50132-7 |
1996 |
3.1.34, B.41 |
Table 3 - CCTV surveillance systems (continued)
CLC/TR 50531:2009 -44 -
|
No. |
Term |
Definition |
Ref. publication |
Year |
Ref. |
|
3.65 |
picture zones |
three zones on the picture tube used to evaluate picture performance: zone I is the central picture area defined by a circle equal to 80 % of the picture height; zone II is the area defined by a circle equal to the picture width; zone III is the area outside zone II. Refer to Figure 1. |
EN 50132-4-1 |
2001 |
3.1.17 |
|
3.66 |
pinhole lens |
a specialised lens with a small entrance pupil for surveillance through a very small orifice |
EN 50132-7 |
1996 |
B.42 |
|
3.67 |
pixel |
an acronym for picture element, which is the smallest sample of an image NOTE Sample may be a discrete sample produced by solid state imaging device or a digitised sample. |
EN 50132-2-1 EN 50132-7 |
1997 1996 |
3.1.20 B.43 |
|
3.68 |
preset shot |
a function in pan and tilt units and/or zoom lenses, which allows automatic return to one or more predetermined positions |
EN 50132-7 |
1996 |
3.1.28, B.44 |
|
3.69 |
ramping |
a characteristic of some zoom lenses whereby the effective aperture of the lens decreases as the focal length increased |
EN 50132-7 |
1996 |
3.1.22, B.45 |
|
3.70 |
remote controlled camera equipment |
devices for controlling the functions of camera and ancillary equipment via remote control signals |
EN 50132-7 |
1996 |
B.46 |
|
3.71 |
return loss |
reflection damping of the monitor input termination |
EN 50132-4-1 |
2001 |
3.1.18 |
|
3.72 |
scene brightness |
the observed brightness of the scene, dependent on the scene illumination and scene reflectance |
EN 50132-2-1 EN 50132-7 |
1997 1996 |
3.1.21 B.47 |
|
3.73 |
scene illumination |
the level of illumination (illuminance) on the area to be kept under surveillance |
EN 50132-2-1 EN 50132-7 |
1997 1996 |
3.1.22 3.1.13, B.48 |
|
3.74 |
scene reflectance |
the proportion of the scene illumination reflected by that scene |
EN 50132-2-1 EN 50132-7 |
1997 1996 |
3.1.23 3.1.14, B.49 |
|
3.75 |
slow scan transmission |
the transmission of a series of non-real time images or part images, by means of analogue or digital signals over limited bandwidth transmission media |
EN 50132-7 |
1996 |
3.1.32, B.50 |
|
3.76 |
split screen unit |
equipment which simultaneously displays parts of more-than one image on a single monitor |
EN 50132-7 |
1996 |
B.51 |
|
Table 3 - CCTV surveillance systems (continued) -45- CLC/TR 50531:2009 No. |
Term |
Definition |
Ref. publication |
Year |
Ref. |
|
3.77 |
spot filter lens |
a lens with a graded internal neutral density filter mechanism for further reducing the optical transmission of the lens beyond that achievable by the iris alone |
EN 50132-7 |
1996 |
B.52 |
|
3.78 |
synchronising signal |
a signal that, when fed to cameras, makes the camera generate pictures synchronously |
EN 50132-2-1 |
1997 |
3.1.24 |
|
3.79 |
terminated input |
input with a termination of 75 Ohm |
EN 50132-4-1 |
2001 |
3.1.19 |
|
3.80 |
time lapse recording |
the periodical recording of video signals at pre-defined intervals |
EN 50132-7 |
1996 |
3.1.35, B.54 |
|
3.81 |
time multiplex recording |
a method of recording several video signals on one video channel by time multiplexing the frames of these video signals |
EN 50132-7 |
1996 |
3.1.37, B.55 |
|
3.82 |
time multiplex transmission |
a method of transmitting several video signals on one video channel by time multiplexing the frames of these video signals |
EN 50132-7 |
1996 |
B.56 |
|
3.83 |
time/date generator |
a device for generating time and date and adding them into image |
EN 50132-7 |
1996 |
3.1.30, B.53 |
|
3.84 |
transient response |
ability of the monitor to display a step function luminance transition occurring during a horizontal scan line |
EN 50132-4-1 |
2001 |
3.1.20 |
|
3.85 |
transmission channel |
combination of the transmission medium and necessary amplifiers and other equipment to form a connection between video equipment in a CCTV system |
EN 50132-5 |
2001 |
3.1.2 |
|
3.86 |
transmission number of lens (T) |
the index of the actual light gathering power of the lens |
EN 50132-7 |
1996 |
3.1.21, B.57 |
|
3.87 |
transmission system |
combination of equipment and media that provide the transmission of video signals between the various CCTV equipment |
EN 50132-5 |
2001 |
3.1.3 |
|
3.88 |
tv lines |
the resolution of television equipment expressed as the number of lines relative to the picture height. For a number of N lines (normally alternate black and white lines) the width of each line is 1/N times the picture height |
EN 50132-2-1 |
1997 |
3.1.25 |
|
3.89 |
unterminated input |
input with high impedance, allowing more devices to be connected in parallel |
EN 50132-4-1 |
2001 |
3.1.21 |
|
3.90 |
variable focal length lens |
a lens with adjustable focal length, in which the image of the scene does not remain in focus as the focal length is changed |
EN 50132-7 |
1996 |
B.58 |
