BS ISO 14807-2001 Photography - Transmission and reflection densitometers - Method for determining performance《摄影技术 透射和反射光密度计 性能测定方法》.pdf

1、BRITISH STANDARD BS ISO 14807:2001 Photography Transmission and reflection densitometers Method for determining performance ICS 37.040.10 NO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAWBS ISO 14807:2001 This British Standard, having been prepared under the direction of the Con

2、sumer Products and Services Sector Policy and Strategy Committee, was published under the authority of the Standards Policy and Strategy Committee on 15 October 2001 BSI 15 October 2001 ISBN 0 580 38473 X National foreword This British Standard reproduces verbatim ISO 14807:2001 and implements it as

3、 the UK national standard. The UK participation in its preparation was entrusted to Technical Committee CPW/42, Photography, which has the responsibility to: A list of organizations represented on this committee can be obtained on request to its secretary. Cross-references The British Standards whic

4、h implement international or European publications referred to in this document may be found in the BSI Standards Catalogue under the section entitled “International Standards Correspondence Index”, or by using the “Find” facility of the BSI Standards Electronic Catalogue. A British Standard does no

5、t 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 not of itself confer immunity from legal obligations. aid enquirers to understand the text; present to the responsible in

6、ternational/European committee any enquiries on the interpretation, or proposals for change, and keep the UK interests informed; monitor related international and European developments and promulgate them in the UK. Summary of pages This document comprises a front cover, an inside front cover, ISO t

7、itle page, pages ii to v, a blank page, pages 1 to 11 and a back cover. The BSI copyright date displayed in this document indicates when the document was last issued. Amendments issued since publication Amd. No. Date CommentsReference number ISO 14807:2001(E) INTERNATIONAL STANDARD ISO 14807 First e

8、dition 2001-10-15 Photography Transmission and reflection densitometers Method for determining performance Photographie Densitomtres transmission et rflexion Mthode pour la dtermination de la performanceISO 14807:2001(E) DPF dlcsiremia ihTs PDF file mya ctnoain emdeddeb tyfepcaes. In acccnadroe with

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11、 cera sah neeb taken to enseru taht teh file is suitlbae fro sue by ISO memreb idob.se In teh lnuikley etnev ttah a plborem leratign to it is f,dnuo lpsaee ifnrom teh tneClar Sceterairat at the sserdda givne lebwo. ii ISO 14807:2001(E) iii Contents Page Foreword.iv Introduction.v 1 Scope 1 2 Normati

12、ve references 1 3 Terms and definitions .1 4 Sampling and handling .5 5 Determination of performance .5 5.1 General5 5.2 Repeatability determination5 5.3 Stability determination 6 5.3.1 8 h stability determination 6 5.3.2 7 day stability determination 6 5.4 Bias estimate determination.7 6 Reporting

13、(individual instrument performance).8 6.1 General8 6.2 Repeatability reporting8 6.3 Stability reporting 9 6.4 Bias estimate reporting.9 7 Reporting (performance specifications) .10 Bibliography11ISO 14807:2001(E) iv Foreword ISO (the International Organization for Standardization) is a worldwide fed

14、eration 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 committee has been established has the right to be represented on that comm

15、ittee. 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 electrotechnical standardization. International Standards are drafted in accorda

16、nce with the rules given in the ISO/IEC Directives, Part 3. Draft International Standards adopted by the technical committees are circulated to the member bodies for voting. Publication as an International Standard requires approval by at least 75 % of the member bodies casting a vote. Attention is

17、drawn to the possibility that some of the elements of this International Standard may be the subject of patent rights. ISO shall not be held responsible for identifying any or all such patent rights. International Standard ISO 14807 was prepared by Technical Committee ISO/TC 42, Photography.ISO 1480

18、7:2001(E) v Introduction Over the past few years, the subject of densitometer performance specifications has been discussed at length, with the observation made that the densitometer customer is met with a plethora of claims and specifications, in a variety of formats, pertaining to densitometer per

19、formance. Furthermore, various manufacturers have often used different terminology for describing what is speculated to be the same characteristic. With this in mind, this International Standard was developed and it identifies three characteristics of performance: ISO repeatability, ISO stability an

20、d ISO bias estimate. Standardized methods for evaluating these characteristics are presented herein. Any or all three of these characteristics can be evaluated and used to describe the performance of an individual densitometer and will be useful in comparisons of the performance of densitometers. Th

21、e first two of these characteristics, ISO repeatability and ISO stability, are evaluated in such a way that, by use of suitable periodic sampling of production, a densitometer manufacturer can report average or typical repeatability and stability as specifications for a particular class, type or mod

22、el of densitometer. However, ISO bias estimate cannot necessarily be meaningfully averaged over such a class, type or model, since by determining a mean bias estimate, any instruments that are biased positively will be offset by any that are biased negatively. Because of this, bias estimate for a cl

23、ass, type or model of densitometer (if determined as a simple arithmetic mean of the bias estimates determined for individuals of that class, type or model) is of limited (if any) value and should not be reported. If determined as such an arithmetic mean, it may only be meaningful if that entire cla

24、ss, type or model is fraught with a systematic design defect. There is currently no agreement as to the most meaningful way to provide an ISO bias estimate for a class, type or model of densitometer. The standardized methods for determination of ISO repeatability and ISO stability provide manufacturers with a uniform basis for stating densitometer performance characteristics as specifications, thereby providing the customer with the most useful information. To clarify and provide mutual understanding, a list of definitions applicable to the performance characteristics has been provided.