BS ISO 15781-2015 Photography Digital still cameras Measuring shooting time lag shutter release time lag shooting rate and start-up time《摄影 数码相机 摄影时间延迟、快门释放时间延迟、摄影速度和启动时间的测量》.pdf
《BS ISO 15781-2015 Photography Digital still cameras Measuring shooting time lag shutter release time lag shooting rate and start-up time《摄影 数码相机 摄影时间延迟、快门释放时间延迟、摄影速度和启动时间的测量》.pdf》由会员分享,可在线阅读,更多相关《BS ISO 15781-2015 Photography Digital still cameras Measuring shooting time lag shutter release time lag shooting rate and start-up time《摄影 数码相机 摄影时间延迟、快门释放时间延迟、摄影速度和启动时间的测量》.pdf(36页珍藏版)》请在麦多课文档分享上搜索。
1、BSI Standards PublicationBS ISO 15781:2015Photography Digital stillcameras Measuring shootingtime lag, shutter release timelag, shooting rate, and start-uptimeBS ISO 15781:2015 BRITISH STANDARDNational forewordThis British Standard is the UK implementation of ISO 15781:2015. It supersedes BS ISO 157
2、81:2013 which is withdrawn.The UK participation in its preparation was entrusted to Technical Committee CPW/42, Photography.A list of organizations represented on this committee can be obtained on request to its secretary.This publication does not purport to include all the necessary provisions of a
3、 contract. Users are responsible for its correct application. The British Standards Institution 2015.Published by BSI Standards Limited 2015ISBN 978 0 580 88099 5 ICS 37.040.10 Compliance with a British Standard cannot confer immunity from legal obligations.This British Standard was published under
4、the authority of the Standards Policy and Strategy Committee on 31 March 2015.Amendments/corrigenda issued since publicationDate T e x t a f f e c t e d ISO 2015Photography Digital still cameras Measuring shooting time lag, shutter release time lag, shooting rate, and start-up timePhotographie Camra
5、s numriques Mesurage du dcalage dans le temps de la prise de vue, dcalage dans le temps de louverture de lobjectif, cadence de prise et temps de dmarrageINTERNATIONAL STANDARDISO 15781Second edition 2015-03-15Reference number ISO 15781:2015(E)BS ISO 15781:2015ISO 15781:2015(E)ii ISO 2015 All rights
6、reservedCOPYRIGHT PROTECTED DOCUMENT ISO 2015All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized otherwise in any form or by any means, electronic or mechanical, including photocopying, or posting on the internet or an intranet, without prior wr
7、itten permission. Permission can be requested from either ISO at the address below or ISOs member body in the country of the requester.ISO copyright officeCase postale 56 CH-1211 Geneva 20Tel. + 41 22 749 01 11Fax + 41 22 749 09 47E-mail copyrightiso.orgWeb www.iso.orgPublished in SwitzerlandBS ISO
8、15781:2015ISO 15781:2015(E)Foreword ivIntroduction v1 Scope . 12 Normative references 13 Terms and definitions . 14 Test conditions . 24.1 Illumination of the test scene . 24.2 The chart and positioning of the digital still camera . 34.3 Battery status . 44.4 Memory card . 44.5 Flash . 45 Measuremen
9、ts . 45.1 Definition of measurement. 45.1.1 General 45.1.2 External measurement .65.1.3 Internal measurement 65.2 Measurement method . 65.2.1 Start-up time . 65.2.2 Shooting time lag . 75.2.3 Shutter release time lag . 85.2.4 Shooting rate . 86 Reporting the results . 9Annex A (informative) Test res
10、ults of methods to start the timing device 10Annex B (informative) Timing device .12Annex C (informative) Measurement by internal method 16Annex D (informative) Examples of reporting the result .23Bibliography .25 ISO 2015 All rights reserved iiiContents PageBS ISO 15781:2015ISO 15781:2015(E)Forewor
11、dISO (the International Organization for Standardization) is a worldwide federation of national standards bodies (ISO member bodies). The work of preparing International Standards is normally carried out through ISO technical committees. Each member body interested in a subject for which a technical
12、 committee has been established has the right to be represented on that committee. International organizations, governmental and non-governmental, in liaison with ISO, also take part in the work. ISO collaborates closely with the International Electrotechnical Commission (IEC) on all matters of elec
13、trotechnical standardization.The procedures used to develop this document and those intended for its further maintenance are described in the ISO/IEC Directives, Part 1. In particular the different approval criteria needed for the different types of ISO documents should be noted. This document was d
14、rafted in accordance with the editorial rules of the ISO/IEC Directives, Part 2 (see www.iso.org/directives).Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. ISO shall not be held responsible for identifying any or all such patent
15、rights. Details of any patent rights identified during the development of the document will be in the Introduction and/or on the ISO list of patent declarations received (see www.iso.org/patents).Any trade name used in this document is information given for the convenience of users and does not cons
16、titute an endorsement.For an explanation on the meaning of ISO specific terms and expressions related to conformity assessment, as well as information about ISOs adherence to the WTO principles in the Technical Barriers to Trade (TBT), see the following URL: Foreword Supplementary information .The c
17、ommittee responsible for this document is ISO/TC 42, Photography.This second edition cancels and replaces the first edition (ISO 15781:2013), of which it constitutes a minor revision.iv ISO 2015 All rights reservedBS ISO 15781:2015ISO 15781:2015(E)IntroductionTaking pictures of a moving target was n
18、early impossible in the early days of digital photography. After pressing the exposure button, it took a significant amount of time to capture the image and the chance to preserve the desired moment was gone.Part of the time between pressing the exposure button and the exposed picture is needed to f
19、ocus while another part is needed to adjust the exposure, etc. This unwelcome, but unavoidable period of time is called the shooting time lag. This is often mixed with the term shutter release time lag which is also defined in this International Standard. Optimized systems are nowadays able to decre
20、ase these time lags.Capturing the different stages of a fast moving object is sometimes very important, especially in areas like sports or people photography. This high shooting rate requires a fast image processing within the digital still camera that can be measured according to the method describ
21、ed in this International Standard.When a photographer decides to capture an image of a changing scene, if his or her digital still camera takes a long time to be ready to shoot once it is turned on, the opportunity to capture the image is lost. This time named start-up time is therefore another impo
22、rtant value which can be determined using this International Standard. ISO 2015 All rights reserved vBS ISO 15781:2015ISO 15781:2015(E)BS ISO 15781:2015Photography Digital still cameras Measuring shooting time lag, shutter release time lag, shooting rate, and start-up time1 ScopeThis International S
23、tandard specifies how to measure and report the shooting time lag, shutter release time lag, shooting rate, and start-up time for digital still cameras including camera modules in phones and tablet computers. It includes a method that uses control signals inside the digital still camera and a method
24、 that determines the timing values without requiring access to the inside of the digital still camera.Depending on the method used to start the timing device, there can be a time lag between the activation of the timing device and the closure of the exposure switch of the digital still camera.This I
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