EN IEC 62676-5:2018

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.Video nadzorni sistemi za varnostne aplikacije - 5. del: Specifikacije podatkov in kakovost slike kamerVideoüberwachungsanlagen für Sicherungsanwendungen — Teil 5: Leistungsbeschreibung und Bildqualitätseigenschaften für KamerasSystèmes de vidéosurveillance destinés à être utilisés dans les applications de sécurité - Partie 5: Spécifications des données et performances de la qualité d'image pour les dispositifs de caméraVideo surveillance systems for use in security applications - Part 5: Data specifications and image quality performance for camera devices33.160.40Video sistemiVideo systems13.320Alarmni in opozorilni sistemiAlarm and warning systemsICS:Ta slovenski standard je istoveten z:EN IEC 62676-5:2018SIST EN IEC 62676-5:2018en01-oktober-2018SIST EN IEC 62676-5:2018SLOVENSKI
STANDARD
EUROPEAN STANDARD NORME EUROPÉENNE EUROPÄISCHE NORM
EN IEC 62676-5
August 2018 ICS 13.320
English Version
Video surveillance systems for use in security applications - Part 5: Data specifications and image quality performance for camera devices (IEC 62676-5:2018)
Systèmes de vidéosurveillance destinés à être utilisés dans les applications de sécurité - Partie 5: Spécifications des données et performances de la qualité d'image pour les dispositifs de caméra (IEC 62676-5:2018)
Videoüberwachungsanlagen für Sicherungsanwendungen - Teil 5: Leistungsbeschreibung und Bildqualitätseigenschaften für Kameras (IEC 62676-5:2018) This European Standard was approved by CENELEC on 2018-07-10. CENELEC members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this European Standard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning such national standards may be obtained on application to the CEN-CENELEC Management Centre or to any CENELEC member.
This European Standard exists in three official versions (English, French, German). A version in any other language made by translation under the responsibility of a CENELEC member into its own language and notified to the CEN-CENELEC Management Centre has the same status as the official versions. CENELEC members are the national electrotechnical committees of Austria, Belgium, Bulgaria, Croatia, Cyprus, the Czech Republic, Denmark, Estonia, Finland, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, the Netherlands, Norway, Poland, Portugal, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and the United Kingdom. European Committee for Electrotechnical Standardization
Comité Européen de Normalisation Electrotechnique Europäisches Komitee für Elektrotechnische Normung CEN-CENELEC Management Centre: Rue de la Science 23,
B-1040 Brussels © 2018 CENELEC All rights of exploitation in any form and by any means reserved worldwide for CENELEC Members.
Ref. No. EN IEC 62676-5:2018 E SIST EN IEC 62676-5:2018

Normative references to international publications with their corresponding European publications The following documents are referred to in the text in such a way that some or all of their content constitutes requirements of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. NOTE 1 When an International Publication has been modified by common modifications, indicated by (mod), the relevant EN/HD applies. NOTE 2 Up-to-date information on the latest versions of the European Standards listed in this annex is available here: www.cenelec.eu. Publication Year Title EN/HD Year IEC 60825-1 -
Safety of laser products -- Part 1: Equipment classification and requirements EN 60825-1 -
IEC 61146-1 -
Video cameras (PAL/SECAM/NTSC) - Methods of measurement -- Part 1: Non-broadcast single-sensor cameras EN 61146-1 -
IEC 62471 -
Photobiological safety of lamps and lamp systems EN 62471 -
IEC 62676-1-2 2013
Video surveillance systems for use in security applications -- Part 1-2: Video transmission ¿ General video transmission - requirements EN 62676-1-2 2014
- -
+ AC 2015
IEC 62676-3 -
Video surveillance systems for use in security applications - Part 3: Analog and digital video interfaces EN 62676-3 -
ISO 14524 - Photography – Electronic still picture cameras – Methods for measuring optoelectronic conversion functions (OECFs) - - ITU-R Recommendation BT.601-5 -
Encoding parameters of digital television for studios - -
ITU-R Recommendation BT.709 -
Parameter values for the HDTV* standard for production and international program exchange - -
IEC 62676-5 Edition 1.0 2018-06 INTERNATIONAL STANDARD NORME INTERNATIONALE Video surveillance systems for use in security applications –
Part 5: Data specifications and image quality performance for camera devices
Systèmes de vidéosurveillance destinés à être utilisés dans les applications de sécurité –
Partie 5: Spécifications des données et performances de la qualité d'image pour les dispositifs de caméra
INTERNATIONAL ELECTROTECHNICAL COMMISSION COMMISSION ELECTROTECHNIQUE INTERNATIONALE
ICS 13.320
ISBN 978-2-8322-5763-0
– 2 – IEC 62676-5:2018  IEC 2018 CONTENTS FOREWORD . 7 INTRODUCTION . 9 1 Scope . 10 2 Normative references . 10 3 Terms, definitions and abbreviations . 11 3.1 Terms and definitions . 11 3.2 Abbreviations . 21 4 Description of video surveillance camera specification items . 22 4.1 General . 22 4.2 Camera . 22 4.2.1 Image sensor . 22 4.2.2 Maximum resolution . 25 4.2.3 Minimum illumination . 25 4.2.4 Signal to noise ratio (SNR, S/N ratio) . 26 4.2.5 White balance . 26 4.2.6 Electronic shutter . 27 4.2.7 Electronic sensitivity up (Slow shutter). 27 4.2.8 Dynamic range (DR) . 28 4.2.9 Visible dynamic range (VDR) . 28 4.2.10 Infra-red illumination operating view distance . 28 4.2.11 Day/Night mode (D/N) . 29 4.2.12 Internal image processing performance . 29 4.3 Lens . 30 4.3.1 Focal length . 30 4.3.2 Relative aperture (F-number) . 30 4.3.3 Field of view . 30 4.3.4 Image distortion . 31 4.3.5 Iris control . 31 4.3.6 Mount type . 31 4.3.7 Image flare . 32 4.4 Input / Output . 32 4.4.1 Video output . 32 4.4.2 Auto-iris lens output . 32 4.5 Video output format . 33 4.5.1 Image format standard . 33 4.5.2 Colour representation . 33 4.5.3 Output image pixel number . 33 4.5.4 Output image resolution . 34 4.6 Pan and tilt . 34 4.6.1 Rotation angle . 34 4.6.2 Rotation speed . 34 4.6.3 Preset position function . 35 4.6.4 Preset position accuracy . 35 4.6.5 Audible noise . 35 4.7 Network . 36 4.7.1 Network interface. 36 4.7.2 Image and video compression format. 36 SIST EN IEC 62676-5:2018

IEC 62676-5:2018  IEC 2018 – 3 –
4.7.3 Bit rate control . 36 4.7.4 Maximum frame rate . 37 4.7.5 Maximum number of encoding streams . 37 4.7.6 Multicast streaming . 38 4.7.7 Maximum number of connections . 38 4.7.8 Total encoding performance . 38 4.7.9 Image stream delay (Latency) . 38 4.7.10 Camera storage (Local storage). 39 4.7.11 Audio function. 39 4.7.12 Network protocol. 39 4.7.13 Camera time synchronization and localization . 40 4.8 Network security . 40 4.8.1 General description . 40 4.8.2 Network authentication . 40 4.8.3 Video authentication and watermarking . 41 4.9 Other specifications . 41 5 Measurement methods of video surveillance camera specification items . 41 5.1 Setting of standard shooting condition . 41 5.1.1 General . 41 5.1.2 Common standard shooting condition . 42 5.2 Video signal quantization level . 44 5.2.1 General . 44 5.2.2 Digital video signal quantization level . 44 5.2.3 Other quantization levels . 44 5.3 Measurement environment . 44 5.3.1 General . 44 5.3.2 Test chart . 45 5.3.3 Software for measurement . 48 5.4 Measuring methods . 48 5.4.1 General . 48 5.4.2 Resolution . 48 5.4.3 Minimum illumination . 56 5.4.4 Dynamic range . 59 5.4.5 Visible dynamic range (VDR) . 67 5.4.6 Infra-red illumination operating view distance . 70 5.4.7 Image distortion . 73 5.4.8 Image flare . 77 5.4.9 Capture frame rate . 84 Annex A (normative)
Sine wave star test chart . 88 Annex B (informative)
Infra-red illuminator safety requirements according to IEC 62471. 91 B.1 General . 91 B.2 Declaration of the hazard distance . 91 B.3 Other information to be declared . 92 B.4 Item indication . 92 B.5 Content indication . 92 Annex C (informative)
Low light performance method . 93 C.1 General . 93 C.1.1 General . 93 SIST EN IEC 62676-5:2018

– 4 – IEC 62676-5:2018  IEC 2018 C.1.2 Test chart . 93 C.1.3 Creation of the coloured dead leaves structure . 94 C.1.4 Capturing a reference image . 94 C.1.5 Capture of the test images . 94 C.1.6 Image quality aspects affected by low light . 94 C.1.7 Presentation of the results . 96 C.2 Example for generating a single performance value from measured results. 96 C.3 Description of test chart example . 97 C.3.1 General . 97 C.3.2 Chart sizes and background . 98 C.3.3 Sine wave modulated starburst patterns . 98 C.3.4 OECF patches . 98 C.3.5 Colour patches . 98 C.3.6 Dead leaves . 100 C.3.7 Slanted edges and visual structures . 101 C.3.8 Small sine wave modulated starburst patterns . 101 C.3.9 Centre marks . 101 Annex D (informative)
Streaming bit rate (bit-stream) . 102 D.1 General . 102 D.2 Description . 102 D.3 Uncompressed and compressed video streams . 102 D.4 Content indication . 103 D.4.1 General . 103 D.4.2 Video streaming in a system . 103 D.4.3 Network traffic analysis (NTA) . 103 D.5 Measuring the video streaming . 104 D.5.1 General . 104 D.5.2 The procedure of measuring streaming bit rate in a system . 104 Annex E (informative)
IP video latency measurement . 107 E.1 General . 107 E.2 Description . 107 E.3 Visual perception of the latency . 109 E.4 Measurement procedure for IP video latency . 109 E.5 Content indication . 110 Annex F (informative)
Motion blur measurement . 111 F.1 General . 111 F.2 Description . 111 F.3 Projected pixel shift (PPS) due to moving objects . 111 F.4 Content indication . 111 F.5 Calculating the projected pixel shift of moving objects . 112 F.6 Calculating the projected pixel shift of moving objects at various angles . 113 F.7 Acceptable PPS . 113 F.8 Test chart measuring of moving objects . 114 Annex G (informative)
SD/HD test target example . 118 Annex H (informative)
UL test chart implementations . 119 Annex I (informative)
Explanation of image flare from light source within and outside of camera field of view . 120 I.1 Image flare of light source within the field of view . 120 SIST EN IEC 62676-5:2018

IEC 62676-5:2018  IEC 2018 – 5 –
I.2 Image flare of light source outside of the field of view . 120 Bibliography . 122
Figure 1 – Test set-up for reflective test chart . 45 Figure 2 – Test set-up for transparent test chart . 46 Figure 3 – Test set-up for fixture with lamps . 47 Figure 4 – Alignment of the camera with the target plane using a mirror . 48 Figure 5 – IEC 61146-1 No. 4 and No. 5 (Resolution chart) . 49 Figure 6 – ISO 12233:2000 Resolution test chart . 50 Figure 7 – Sine wave modulated starburst pattern test chart . 51 Figure 8 – The star is divided into eight segments for the analysis . 53 Figure 9 – The star is analysed radius by radius, equivalent to frequency by frequency . 53 Figure 10 – The pixels along a specific radius are located . 54 Figure 11 – Digital code values as a function of the angle . 54 Figure 12 – Calculation of the contrast of the sine curve . 55 Figure 13 – Example of grey scale test chart . 57 Figure 14 – Example of OECF transparent test chart . 57 Figure 15 – Signal difference between white area and black surrounding . 58 Figure 16 – Example of lamp fixture . 60 Figure 17 – Possible arrangements of luminance levels . 61 Figure 18 – Graphical presentation of results . 67 Figure 19 – Example of signal level . 69 Figure 20 – Graphical presentation of results . 70 Figure 21 – White chart . 71 Figure 22 – Camera positioning . 71 Figure 23 – Video level . 72 Figure 24 – Conversion measurement using electronic shutter . 73 Figure 25 – Regular grid (solid lines) in the scene is distorted and the red diamonds mark the position of the intersections in the image produced by the camera . 74 Figure 26 – Line grid pattern chart . 75 Figure 27 – Schematic drawings for measuring the horizontal line distortion . 77 Figure 28 – Schematic drawings for measuring the vertical line distortion . 77 Figure 29 – Example test chart with multiple black areas (“Dot pattern chart”) . 79 Figure 30 – Set-up of image flare device . 80 Figure 31 – Image flare lamp for cameras with small field of view (large focal length) . 81 Figure 32 – Image flare lamp for cameras with large field of view (short focal length) . 81 Figure 33 – Evaluation area . 83 Figure 34 – Frame rate test target. 85 Figure A.1 – Sine wave test chart (multiple target version) . 88 Figure C.1 – An example for a multipurpose test chart with frame rate tester . 93 Figure C.2 – An example for a multipurpose test chart . 98 Figure D.1 – Network connection for video streaming measurement . 105 Figure D.2 – An example graph of network traffic . 106 Figure E.1 – Comparison of image compression and video compression . 107 SIST EN IEC 62676-5:2018

– 6 – IEC 62676-5:2018  IEC 2018 Figure E.2 – Example of GOP . 108 Figure E.3 – Video latency . 110 Figure F.1 – Motion blur due to moving objects . 111 Figure F.2 – Calculation of projected pixel shift . 112 Figure F.3 – Movement in various angles . 113 Figure F.4 – Measuring of moving objects . 115 Figure F.5 – Example of moving test chart . 117 Figure G.1 – SD/HD test target example . 118 Figure I.1 – Image flare from a light source within the camera field of view . 120 Figure I.2 – Image flare from a light source outside of the camera field of view . 121
Table 1 – Lighting condition . 42 Table 2 – Relation of illuminance and luminance . 43 Table 3 – Standard camera settings . 43 Table 4 – Digital video signal quantization level . 44 Table 5 – Camera settings for resolution . 49 Table 6 – Camera settings for minimum illumination . 56 Table 7 – Camera settings for dynamic range . 59 Table 8 – Example results of dynamic range measurement . 65 Table 9 – Camera settings for visible dynamic range . 68 Table 10 – Camera settings for IR illumination operating view distance . 70 Table 11 – Camera settings for image flare . 78 Table 12 – Camera settings for capture frame rate . 85 Table A.1 – Features of sine wave test chart . 89 Table A.2 – Design of sine wave star test chart . 90 Table C.1 – Results table of an example camera . 96 Table C.2 – Results table of an example camera . 97
IEC 62676-5:2018  IEC 2018 – 7 –
INTERNATIONAL ELECTROTECHNICAL COMMISSION ____________
VIDEO SURVEILLANCE SYSTEMS FOR USE
IN SECURITY APPLICATIONS –
Part 5: Data specifications and image
quality performance for camera devices
FOREWORD 1) The International Electrotechnical Commission (IEC) is a worldwide organization for standardization comprising all national electrotechnical committees (IEC National Committees). The object of IEC is to promote international co-operation on all questions concerning standardization in the electrical and electronic fields. To this end and in addition to other activities, IEC publishes International Standards, Technical Specifications, Technical Reports, Publicly Available Specifications (PAS) and Guides (hereafter referred to as “IEC Publication(s)”). Their preparation is entrusted to technical committees; any IEC National Committee interested in the subject dealt with may participate in this preparatory work. International, governmental and non-governmental organizations liaising with the IEC also participate in this preparation. IEC collaborates closely with the International Organization for Standardization (ISO) in accordance with conditions determined by agreement between the two organizations. 2) The formal decisions or agreements of IEC on technical matters express, as nearly as possible, an international consensus of opinion on the relevant subjects since each technical committee has representation from all interested IEC National Committees.
3) IEC Publications have the form of recommendations for international use and are accepted by IEC National Committees in that sense. While all reasonable efforts are made to ensure that the technical content of IEC Publications is accurate, IEC cannot be held responsible for the way in which they are used or for any misinterpretation by any end user. 4) In order to promote international uniformity, IEC National Committees undertake to apply IEC Publications transparently to the maximum extent possible in their national and regional publications. Any divergence between any IEC Publication and the corresponding national or regional publication shall be clearly indicated in the latter. 5) IEC itself does not provide any attestation of conformity. Independent certification bodies provide conformity assessment services and, in some areas, access to IEC marks of conformity. IEC is not responsible for any services carried out by independent certification bodies. 6) All users should ensure that they have the latest edition of this publication. 7) No liability shall attach to IEC or its directors, employees, servants or agents including individual experts and members of its technical committees and IEC National Committees for any personal injury, property damage or other damage of any nature whatsoever, whether direct or indirect, or for costs (including legal fees) and expenses arising out of the publication, use of, or reliance upon, this IEC Publication or any other IEC Publications.
8) Attention is drawn to the Normative references cited in this publication. Use of the referenced publications is indispensable for the correct application of this publication. 9) Attention is drawn to the possibility that some of the elements of this IEC Publication may be the subject of patent rights. IEC shall not be held responsible for identifying any or all such patent rights. International Standard IEC 62676-5 has been prepared by IEC technical committee 79: Alarm and electronic security systems. The text of this International Standard is based on the following documents: FDIS Report on voting 79/607/FDIS 79/609/RVD
Full information on the voting for the approval of this International Standard can be found in the report on voting indicated in the above table. This document has been drafted in accordance with the ISO/IEC Directives, Part 2. SIST EN IEC 62676-5:2018

– 8 – IEC 62676-5:2018  IEC 2018 A list of all parts in the IEC 62676 series, published under the general title Video surveillance systems for use in security applications, can be found on the IEC website. The committee has decided that the contents of this document will remain unchanged until the stability date indicated on the IEC website under "http://webstore.iec.ch" in the data related to the specific document. At this date, the document will be
• reconfirmed, • withdrawn, • replaced by a revised edition, or • amended.
IMPORTANT – The 'colour inside' logo on the cover page of this publication indicates that it contains colours which are considered to be useful for the correct understanding of its contents. Users should therefore print this document using a colour printer.
IEC 62676-5:2018  IEC 2018 – 9 –
INTRODUCTION IEC Technical Committee 79 in charge of alarm and electronic security systems together with many governmental organizations, test houses and equipment manufacturers has defined a common framework for video surveillance transmission in order to achieve interoperability between products. The IEC 62676 series of standards on video surveillance systems is divided into five independent parts: Part 1: System requirements Part 2: Video transmission protocols Part 3: Analog and digital video interfaces Part 4: Application guidelines
Part 5: Data specifications and image quality performance for camera devices Each part offers its own clauses for the scope, normative references, definitions and requirements. The purpose of this part of IEC 62676 is to specify representation and measuring methods of performance values to be described in materials such as instruction manuals, brochures and specifications of video surveillance camera equipment, and provide convenience for users, installers, integrators and maintenance companies, etc.
– 10 – IEC 62676-5:2018  IEC 2018 VIDEO SURVEILLANCE SYSTEMS FOR USE
IN SECURITY APPLICATIONS –
Part 5: Data specifications and image
quality performance for camera devices
1 Scope This part of IEC 62676 defines recommendations and requirements for representation and measuring methods of performance values to be described in materials such as instruction manuals, brochures and specifications of video surveillance camera equipment. This document consists of two parts. The first part is requirements for description of video surveillance camera specification items. The second part is requirements for measurement methods of video surveillance camera specification items.
A video surveillance camera's output can be analogue (e.g. composite video such as NTSC or PAL) or digital (e.g. compressed network output, uncompressed SDI (serial digital output), etc.). 2 Normative references The following documents are referred to in the text in such a way that some or all of their content constitutes requirements of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. IEC 60825-1, Safety of laser products – Part 1: Equipment classification and requirements IEC 61146-1, Video cameras (PAL/SECAM/NTSC) – Methods of measurement – Part 1: Non-broadcast single-sensor cameras IEC 62471, Photobiological safety of lamps and lamp systems IEC 62676-1-2:2013, Video surveillance systems for use in security applications – Part 1-2: System requirements – Performance requirements for video transmission IEC 62676-3, Video surveillance systems for use in security applications – Part 3: Analog and digital video interfaces ISO 14524, Photography – Electronic still picture cameras – Methods for measuring opto-electronic conversion functions (OECFs) ITU-R Recommendation BT.601, Studio encoding parameters of digital television for standard 4:3 and wide-screen 16:9 aspect ratios ITU-R Recommendation BT.709, Parameter values for the HDTV standards for production and international programme exchange SIST EN IEC 62676-5:2018

IEC 62676-5:2018  IEC 2018 – 11 –
3 Terms, definitions and abbreviations 3.1 Terms and definitions 3.1.1
4k image size format with approximately 4Ø000 horizontal pixels defined as SMPTE 2036 (3Ø840 × 2Ø160 UHDTV) 3.1.2
aperture opening of lens diaphragm through which light passes 3.1.3
bit rate amount of digital signal in a second 3.1.4
C/CS mount lens physical mounting standards (C mount and CS mount) typically used for video surveillance cameras Note 1 to entry: C mount is an older standard defined as one inch (25,4 mm) in diameter with 32 threads per inch and the flange back distance where an image is projected on a sensor is 17,526 mm.
Note 2 to entry: CS mount is a newer standard which uses the same diameter and thread of C mount, but the flange back distance is 12,5 mm. 3.1.5
colour temperature measure of temperature of a heated surface which generates a radiant energy having the same spectral distribution generated from a blackbody of the same temperature Note 1 to entry: Colour temperature is expressed in kelvins (K). [SOURCE: IEC 60194:2015, 24.1355] 3.1.6
compression process of reducing the size of data (image or video) [SOURCE: IEC 62676-1-1:2013, 3.1.27, modified – In the definition, "data (image or video)" has replaced "a data (image) file".] 3.1.7
compression ratio ratio of the uncompressed size of files, images or videos to the compressed size Note 1 to entry: A high compression ratio means smaller image files and lower image quality and vice versa. [SOURCE: IEC 62676-1-1:2013, 3.1.28, modified – In the definition, "files, images or videos" has replaced "files or images".] 3.1.8
contrast difference in visual luminance properties that makes an object (or its representation in an image) distinguishable from other objects and the background Note 1 to entry: In visual perception of the real world, contrast is determined by the difference in the colour and brightness of the object and other objects within the same field of view. SIST EN IEC 62676-5:2018

– 12 – IEC 62676-5:2018  IEC 2018 [SOURCE: IEC 62676-1-1:2013, 3.1.33] 3.1.9
dome camera camera mounted inside a dome, usually protecting it from outside influences 3.1.10
dynamic range quotient of the signal from the maximum measurable indication of a quantity by the signal from the minimum measurable value of that quantity [SOURCE: IEC 62232:2011, 3.15] 3.1.11
electronic shutter arrangement in the camera changing its sensitivity by electronically controlling the exposure time of the image sensor [SOURCE: IEC 62676-4:2014, 3.1.14] 3.1.12
encoding streams series of consecutive encoded images or video from the same image source which are transmitted from one system component to another [SOURCE: IEC 62676-1-1:2013, 3.1.77, modified – In the definition, "encoding streams" has replaced "image streams", "encoded images or video" has replaced "images".] 3.1.13
exposure control electronic control of the time needed to expose image sensor pixels to light Note 1 to entry: For "live" video stream the default exposure is typically 1/25 s or 1/30 s. 3.1.14
exposure time length of time for which image sensor pixels are exposed to light 3.1.15
flare
light falling on an image, in an imaging system, which does not emanate from the subject point
Note 1 to entry: Flare is also sometimes referred to as veiling glare.
Note 2 to entry: See also image flare (3.1.30).
3.1.16
frame full frame of video as acquired in progressive mode or as combination of two interlaced fields together [SOURCE: IEC 62676-2-1:2013, 3.1.20, modified – The specific context "" is added.] 3.1.17
frame rate number of frames per second SIST EN IEC 62676-5:2018

IEC 62676-5:2018  IEC 2018 – 13 –
3.1.18
F-number iris opening of a lens defined as a ratio between the focal length of the lens and its iris opening Note 1 to entry: It is typically a number larger then 1 (e.g. F1.4, F2, F2.8) and indicates the amount of light coming through the lens where a lens with lower F-number transmits more light than a lens with higher numbers.
3.1.19
gain camera function to amplify the electronic signal 3.1.20
gamma correction correction of the linear response of a camera to compensate for the monitor screen non-linear response Note 1 to entry: It is measured with the exponential value of the curve describing the non-linearity. A typical monochrome monitor’s gamma is 2,2, and a camera needs to be set to the inverse value of 2,2 (which is 0,45) for the overall system to respond linearly (i.e. unity).
3.1.21
global shutter image read-out method of the image sensor where the exposure timing of all visible lines is the same Note 1 to entry: Global shutter is a term associated with the CMOS image sensors where the image read-out is usually sequential, i.e. line by lin
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