1、BRITISH STANDARD BS EN 61146-2:1997 IEC 61146-2: 1997 Video cameras (PAL/SECAM/NTSC) Methods of measurement Part 2: Two- and three-sensor professional cameras The European Standard EN 61146-2:1997 has the status of a British Standard ICS 33.160.40BSEN61146-2:1997 This British Standard, having been p
2、repared under the directionof the ElectrotechnicalSector Board,was published under theauthorityof the StandardsBoardand comes into effect on 15 December 1997 BSI 07-1999 ISBN 0 580 28871 4 Amendments issued since publication Amd. No. Date CommentsBSEN61146-2:1997 BSI 07-1999 i Contents Page National
3、 foreword ii Foreword 2 Text of EN 61146-2 5BSEN61146-2:1997 ii BSI 07-1999 National foreword This British Standard is the English language version of EN 61146-2:1997. It is identical with IEC 61146-2:1997. The UK participation in its preparation was entrusted by Technical Committee EPL/100, Audio,
4、video and multimedia systems and equipment, to Subcommittee EPL/100/3, Equipment and systems in the field of audio, video and audiovisual engineering, which has the responsibility to: aid enquirers to understand the text; present to the responsible international/European committee any enquiries on t
5、he interpretation, or proposals for change, and keep the UK interests informed; monitor related international and European developments and promulgate them in the UK. IEC 61146 consists of the following parts: Part 1: Non-broadcast single-sensor cameras; Part 2: Two- and three-sensor professional ca
6、meras; Part 3: Non-broadcast camera-recorders; Part 4: Automatic functions of video cameras and camera recorders. A list of organizations represented on this subcommittee can be obtained on request to its secretary. From 1 January 1997, all IEC publications have the number 60000 added to the old num
7、ber. For instance, IEC27-1 has been renumbered as IEC60027-1. For a period of time during the change over from one numbering system to the other, publications may contain identifiers from both systems. Cross-references Attention is drawn to the fact that CEN and CENELEC Standards normally include an
8、 annex which lists normative references to international publications with their corresponding European publications. The British Standards which implement these international or European publications may be found in the BSI Standards Catalogue under the section entitled “International Standards Cor
9、respondence Index”, or by using the “Find” facility of the BSI Standards Electronic Catalogue. A British Standard does not purport to include all the necessary provisions of a contract. Users of British Standards are responsible for their correct application. Compliance with a British Standard does
10、not of itself confer immunity from legal obligations. Summary of pages This document comprises a front cover, an inside front cover, pages i and ii, theEN title page, pages 2 to 42 and a back cover. This standard has been updated (see copyright date) and may have had amendments incorporated. This wi
11、ll be indicated in the amendment table on theinside front cover.EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN 61146-2 October 1997 ICS 33.160.40 Descriptors: Video recording, recording apparatus, video cameras, performance evaluation, measurements, test results, comparison, sensitivity, signa
12、l to noise ration, resolution, colour, luminance, distorsion, test chart English version Video cameras (PAL/SECAM/NTSC) Methods of measurement Part 2: Two- and three-sensor professional cameras (IEC 61146-2:1997) Camras vido (PAL/SECAM/NTSC) Mthodes de mesure Partie 2: Camras professionnelles deux e
13、t trois capteurs (CEI 61146-2:1997) Videokameras (PAL/SECAM/NTSC) Meverfahren Teil 2: Zwei- und Drei-Sensorkameras fr professionelle Anwendung (IEC 61146-2:1997) This European Standard was approved by CENELEC on 1997-10-01. CENELEC members are bound to comply with the CEN/CENELEC Internal Regulation
14、s 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 Central Secretariat or to any CENELEC member. This Eur
15、opean 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 Central Secretariat has the same status as the official versions. CENELEC members are
16、 the national electrotechnical committees of Austria, Belgium, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and United Kingdom. CENELEC European Committee for Electrotechnical Standardization Comit Europen d
17、e Normalisation Electrotechnique Europisches Komitee fr Elektrotechnische Normung Central Secretariat: rue de Stassart 35, B-1050 Brussels 1997 CENELEC All rights of exploitation in any form and by any means reserved worldwide for CENELEC members. Ref. No. EN 61146-2:1997 EEN61146-2:1997 BSI 07-1999
18、 2 Foreword The text of document 100C/59/FDIS, future edition1 of IEC 61146-2, prepared by SC 100C, Audio, video and multimedia subsystems and equipment, of IECTC100, Audio, video and multimedia systems and equipment, was submitted to the IEC-CENELEC parallel vote and was approved by CENELEC as EN61
19、146-2 on1997-10-01. The following dates were fixed: Annexes designated “normative” are part of the body of the standard. Annexes designated “informative” are given for information only. In this standard,Annex ZA is normative and Annex A is informative. Annex ZA has been added by CENELEC. Endorsement
20、 notice The text of the International Standard IEC61146-2:1997 was approved by CENELEC as a European Standard without any modification. latest date by which the EN has to be implemented at national level by publication of an identical national standard or by endorsement (dop) 1998-07-01 latest date
21、by which the national standards conflicting with the EN have to be withdrawn (dow) 1998-07-01EN61146-2:1997 BSI 07-1999 3 Contents Page Foreword 2 1 General 5 1.1 Scope 5 1.2 Normative references 5 1.3 Conditions 5 1.3.1 Environmental conditions 5 1.3.2 Conditions of measurements 5 1.3.3 Reference o
22、utput levels 7 2 Video characteristics 7 2.1 Sensitivity 7 2.1.1 Reference subject illumination 7 2.1.2 Reference sensitivity (alternative method) 9 2.1.3 Minimum subject illumination 9 2.2 Resolution 10 2.2.1 Modulation depth 10 2.2.2 Common resolution 12 2.3 Signal-to-noise ratio 12 2.3.1 Characte
23、ristics to be specified 12 2.3.2 Measurement conditions 12 2.3.3 Method of measurement 14 2.3.4 Presentation of results 14 2.4 Waveform distortions (streaking) 14 2.4.1 Characteristics to be specified 14 2.4.2 Measurement conditions 14 2.4.3 Method of measurement 16 2.4.4 Presentation of results 16
24、2.5 Gamma and white balance tracking characteristics 16 2.5.1 Characteristics to be specified 16 2.5.2 Measurement conditions 16 2.5.3 Method of measurement 17 2.5.4 Presentation of results 17 2.6 Colour and white reproduction non-uniformity 18 2.6.1 Characteristics to be specified 18 2.6.2 Measurem
25、ent conditions 18 2.6.3 Method of measurement 18 2.6.4 Presentation of results 19 2.7 Tracking error of white shading 19 2.7.1 Characteristics to be specified 19 2.7.2 Measurement conditions 19 2.7.3 Method of measurement 20 2.7.4 Presentation of results 21 Page 2.8 Black shading 21 2.8.1 Characteri
26、stics to be specified 21 2.8.2 Measurement conditions 21 2.8.3 Method of measurement 21 2.8.4 Presentation of results 21 2.9 White clipping and compression rate 21 2.9.1 Characteristics to be specified 21 2.9.2 Measurement conditions 21 2.9.3 Method of measurement 22 2.9.4 Presentation of results 22
27、 2.10 Dynamic range and contrast range 22 2.10.1 Characteristics to be specified 22 2.10.2 Method of measurement 22 2.10.3 Presentation of results 22 2.11 Colour reproduction 22 2.11.1 Characteristics to be specified 23 2.11.2 Measurement conditions 23 2.11.3 Method of measurement 25 2.11.4 Calculat
28、ion 25 2.11.5 Original colour chip samples 27 2.11.6 Presentation of results 27 2.11.7 Camera for which only a composite video signal is available 27 2.12 Flare 27 2.12.1 Characteristics to be specified 28 2.12.2 Measurement conditions 28 2.12.3 Method of measurement 29 2.12.4 Presentation of result
29、s 29 3 Other anomalies 29 3.1 Moires 29 3.1.1 For a camera which provides R, G, B outputs 29 3.1.2 For a camera which provides composite video output only 29 3.2 Lag 29 3.2.1 Measurement conditions 29 3.2.2 Method of measurement 29 3.2.3 Presentation of results 29 3.3 Sticking (image retention) 30 3
30、.3.1 Measurement conditions 30 3.3.2 Method of measurement 30 3.3.3 Presentation of results 30 3.4 Blooming 30 3.4.1 Method of measurement 30 3.4.2 Presentation of results 30EN61146-2:1997 4 BSI 07-1999 Page 3.5 Smearing 30 3.5.1 Method of measurement 30 3.5.2 Presentation of results 31 3.6 Registra
31、tion 31 3.6.1 Characteristics to be specified 31 3.6.2 Method of measurement 31 3.6.3 Alternative method of measurement 34 3.7 Geometric distortions 37 3.7.1 Conventional method 37 3.7.2 Alternative method 37 Annex A (informative) Bibliography 41 Annex ZA (normative) Normative references to internat
32、ional publications with their corresponding European publications 42 Figure 1 Equipment arrangement for measurement of sensitivity 7 Figure 2 Specification of grey scale test chart 8 Figure 3 Equipment arrangement for measurement of resolution 11 Figure 4 Specification of the transparent test charts
33、 for measurement of modulation depth 11 Figure 5 Equipment arrangement for measurement of signal-to-noise ratio 13 Figure 6 Specification of the reflective test chart for measurements signal-to-noise ratio and white shading 13 Figure 7 Equipment arrangement for measurement of waveform distortion 15
34、Figure 8 Specification of the transparent test chart for measurement of streaking 15 Figure 9 Examples of waveforms 16 Figure 10 Equipment arrangement for measurement of gamma and white balance tracking characteristics, colour and white reproduction, white clipping and compression rate, and flare 17
35、 Figure 11 Specification of the rectangle 18 Figure 12 Equipment arrangement for measurement of tracking error of white shading 19 Figure 13 Waveform of the tracking error of white shading 20 Figure 14 Equipment arrangement for measurement of colour reproduction 24 Page Figure 15 Specification of ar
36、rangement of colour samples for measurement of colour reproduction 24 Figure 16 Specification of the test chart for measurement of overall flare (average picture level = 50%) 28 Figure 17 Specification of the test chart for measurement of localized flare (average picture level = 99%) 28 Figure 18 Sp
37、ecification of the transparent test chart for measurement of smearing and blooming 30 Figure 19 Equipment arrangement for measurement of registration (conventional method) 32 Figure 20 Specification of the reflective test chart for measurement of registration (conventional method) 33 Figure 21 Defin
38、ition of the zones for a conventional method of measurement of registration 34 Figure 22 Equipment arrangement for the alternative method of measurement of registration 35 Figure 23 Specification of the V pattern test chart for the alternative measurement method of registration 35 Figure 24 Dimensio
39、nal specification of V pattern 36 Figure 25 Extraction of timing offsets for calculation of registration errors 36 Figure 26 Equipment arrangement for measurement of geometric distortion 38 Figure 27 Definition of the zones in the V pattern test chart for measurement of geometric distortion 38 Figur
40、e 28 Definitions of barrel and pincushion distortion 39EN61146-2:1997 BSI 07-1999 5 1 General 1.1 Scope This part of IEC 61146 applies to the assessment of performance of professional colour video cameras equipped with two and three tubes or solid state imagers, used for educational or industrial pu
41、rposes and in other applications. This part of IEC 61146 defines test patterns, measurement conditions, and methods of measurement, so as to enable the comparison of the results of measurements. The methods of measurement are designed to enable the assessment of the performance of cameras by using l
42、ight input from the lens and any electrical outputs of the cameras, for example, R-G-B signals, Y-C separate signals, and composite video signals. This standard does not specify limiting values for various parameters. 1.2 Normative references The following normative documents contain provisions whic
43、h, through reference in this text, constitute provisions of this part of IEC61146. At the time of publication, the editions indicated were valid. All normative documents are subject to revision, and parties to agreements based on this part of IEC61146 are encouraged to investigate the possibility of
44、 applying the most recent editions of the normative documents listed below. Members of IEC and ISO maintain registers of currently valid International Standards. IEC 61146-1:1994, Video cameras (PAL/SECAM/NTSC) Methods of measurement Part 1: Non-broadcast single-sensor cameras. ISO/CIE 10526:1991, C
45、IE colorimetric standard illuminants. ISO/CIE 10527:1991, CIE colorimetric standard observers. EBU Techn. 3237:1983, Methods of measurement of the colorimetric fidelity of television cameras. Corrigendum (1989) Supplement 1:1989, Measurement procedures. Publication CIE 15.2:1986, Colorimetry. 1.3 Co
46、nditions 1.3.1 Environmental conditions All measurements shall be carried out within the environmental conditions specified by the manufacturer of the camera under assessment. The environmental conditions during measurement, at least the temperature and the relative humidity, shall be reported toget
47、her with the results of measurements. An adequate warm up time shall be allowed. 1.3.2 Conditions of measurements The measurements shall be carried out either by measuring the output signals of the device when the camera is shooting different test charts, depending on the characteristic to be measur
48、ed, or by measuring the distortions on a monitor screen. 1.3.2.1 Test charts All the test charts used for measurement shall be specified with the results, together with the lighting conditions (illumination intensity, correlated colour temperature, etc.). The test charts shall be shot by the camera
49、so that the frame limited by the arrows coincides exactly with the edges of the picture displayed on the video monitor in underscan mode. The test charts may be either reflective or transparent. Where there is a choice, the reflective test chart shall be used in questionable cases.EN61146-2:1997 6 BSI 07-1999 1.3.2.2 Illumination The illumination of reflective test charts shall be performed by two spotlights with a correlated colour temperature of3200 placed at45 with respect t
