EN 61146-1-1996 en Video Cameras (PAL SECAM NTSC) Methods of Measurement Part 1 Non-Broadcast Single-Sensor Cameras《摄像机(PAL SECAM NTSC制式) 测量方法 第1部分 非广播单传感器摄像机 IEC 1146-1 1994》.pdf
《EN 61146-1-1996 en Video Cameras (PAL SECAM NTSC) Methods of Measurement Part 1 Non-Broadcast Single-Sensor Cameras《摄像机(PAL SECAM NTSC制式) 测量方法 第1部分 非广播单传感器摄像机 IEC 1146-1 1994》.pdf》由会员分享,可在线阅读,更多相关《EN 61146-1-1996 en Video Cameras (PAL SECAM NTSC) Methods of Measurement Part 1 Non-Broadcast Single-Sensor Cameras《摄像机(PAL SECAM NTSC制式) 测量方法 第1部分 非广播单传感器摄像机 IEC 1146-1 1994》.pdf(101页珍藏版)》请在麦多课文档分享上搜索。
1、BRITISH STANDARD Video cameras (PAL/SECmSC) - Methods of measurement Part 1. Non-broadcast single-sensor cameras The European Standard EN 61146-1 : 1996 hag the status of a Britjsh Standard ICs 33.160.40 NO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAW i1146-1: 1997 1994 EC 114
2、6-1 : BS EN 61146-1 : 1997 Amd. No. This British Standard, hawig been prepared under the direction of the Elechtechnicai Sector Board, was published under the authority of the standards Board and comes into effect on 15 March 1997 O BSI 1997 Date Textaffected Committees responsible for this British
3、Standard The preparation of this British Standaxd was entrusted by Technical Committee EPU100, Audio, video and multimedia systems and equipment, to Subcommittee EPUlL3, Equipment and systems in the field of audio, video and audiovisual engineering, upon which the following bodies were represented A
4、ssociation of British Theatre Technicians Audio Engineering Society British Broadcasting Corporation British Educational Suppliers Association British Federation of Audio British Radio and Electronic Equipment Manufkturers Association British Telecommunications plc Federation of the Electronics indu
5、stry Independent Television Association (lNA) Institute of Sound and Communication Engineers Institution of Electrical Engineers International Association of Broadcasting Manufacturem Professional Lighting and Sound Association Royal Institute of British Architeds Royal National Institute for Deaf P
6、eople Society of Cable Television Engineers The foiiowing BSI references relate to the work on this standard: Committee reference EPU100B Draft for comment 89/25912 DC ISBN O 680 26931 O STD-BSI BS EN bLLVb-L-ENGL 1777 Lb24bb7 0578q77 T50 BS EN 61146-1 : 1997 O BSI 1997 Contents Commim responsible N
7、ationai foreword page Inside front cover ii Foreword Text of EN 611461 2 3 i STD-BSI BS EN bLLqb-1-ENGL 1797 Lb24bb7 0598500 572 BS EN 61146-1 : 1997 National foreword This British Standard has been prepared by Subcommittee EPLlOOB, and is the English ianguage version of EN 6114G1: 1996 Video camera
8、s (T“EC.TSC) Methods of measurement Part 1. Nombroadcast Lo is the luminance of the TV display screen; K is the constant (gain of the camera amplifier); La is the luminance signal at the output of the imager. The overall characteristics of the analyser plus the electro-optic converter will be: where
9、 A m The result mL, shows that the proportionality condition is satisfactory to obtain a correct colour reproduc- tion (see figures 6b, 6c and 6d). is the constant (gain of the TV set amplifier); is the phosphor dot brightness efficiency. 9.2 Method of measurement a) The equipment arrangement shall
10、be as shown in figure 6a. b) The test chart shall be a grey-scale chart. The reflectance of each area from black to white shall vary according to a curve having a gamma of 2,2 (see figure 6c). c) The conditions of shooting shall be those mentioned in 3.3. d) For SECAM, see 7.2, item c). e) The outpu
11、t signal shall be measured by an oscilloscope. If the camera has a gamma of 0,45 (that is the inverse of the grey scale 2,2), the video output signal represents a grey scale having a gamma of 1; this means that the amplitude of the steps related to the black level are in equal increments (see figure
12、s 6d and se). 1) The amplitude Y) of each step n of the output signal, that is from the level at the step n=3 to the level at the step n-10, shall be measured (see figure 6e). g) The reference level Vref shall be the amplitude from blanking level to white level (see figure 6e). However, step V,(O) m
13、ay be taken as reference; this should be reported with the results of measurement. - - STDoBSI BS EN b334b-I-ENGL 3777 = Lb24bb7 0578523 227 = Page 21 EN 61146-1 : 1996 h) The gamma error shall be calculated as the percentage NL (n) of the deviation of the level at each Vo(n). from the theoretical l
14、evel V,(n) of the corresponding step. The errors shall be calculated from step n=3 to step n=lO, as shown in the following formula: where V,(n) = V,n/lO for n=3 to n=10 NL(n) = (Vo(n) - V,(n) 1 Vt(n) x 100 (“/o) 9.3 Presentation of results The results shall be reported in a table showing the number
15、n of each step, and the gamma error in percentage for the two references, as follows: a) blanking level; b) step Vo(0). I -1 I cc- I Ci: = 3100 K I II Input terminated by 75 0 input not terminated Tes ohar No. 1 Und.rsoan adour ,TV monitor Grey-scale pattern (reflective type) - Gamma: 2.2 - Reflecta
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