ISO/TR TECHNICAL REPORT 14672 First edition 2000-07-15 Graphic technology Statistics of the natural SCID images defined in ISO 12640 normales (SCID) définies dans I'lSO 12640 Reference number ISO/TR 14672:2000(E) (so @ ISO 2000 ISO/TR 14672:2000(E) PDF disclaimer This PDF file may contain embedded typefaces. In accordance with Adobe's licensing policy, this file may be printed or viewed but shall not be edited unless the typefaces which are embedded are licensed to and installed on the computer performing the editing. In downloading this area. Adobe is atrademarkof Adobe Systems Incorporated. Details of the software products used to create this PDF file can be found in the General Info relative to the file; the PDF-creation parameters were optimized for printing. Every care has been taken to ensure that the file is suitable for use by isO member bodies. In the unlikely event ISO2000 All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized in any form or by any means, electronic in the country of the requester. ISO copyright office Case postale 56 : CH-1211 Geneva 20 Tel. + 41 22 749 01 11 Fax + 41 22 749 09 47 E-mail [email protected] Web www.iso.ch Printed in Switzerland @IsO2000-Allrightsreserved ISO ISO/TR 14672:2000(E) Contents Page Foreword .. iv Introduction Scope 2 Reference 3 SCID image description 4 Colourdistribution 4.1 Data value histograms and related things 4.2 Average colour values 4.3 4 x 4 covariance matrix 4.4 Three-dimensional volumes 6 5 Spatial frequency characteristics iii CISO ISO/TR 14672:2000(E) Foreword ISO (the International Organization for Standardization) is a worldwide federation of national standards bodies (ISO member bodies).TheworkofpreparingInternationalStandardsisnormallycarriedoutthroughIsOtechnicalcommittees.Eachmember body interested in a subject for which a technical 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 electrotechnical standardization. International Standards are drafted in accordance with the rules given in the ISO/IEC Directives, Part 3. The main task of technical committees is to prepare International Standards. 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. In exceptional circumstances, when a technical committee has collected data of a different kind from that which is normally published as an International Standard ("state of the art", for example), it may decide by a simple majority vote of its participating members to publish a Technical Report. A Technical Report is entirely informative in nature and does not have to be reviewed until the data it provides are considered to be no longer valid or useful. Attention is drawn to the possibility that some of the elements of this Technical Report may be the subject of patent rights ISO shall not be held responsible for identifying any or all such patent rights. ISO/TR 14672 was prepared by Technical Committee ISO TC 130, Graphic technology, Working Group 2, Prepress data exchange. OSIO IS0/TR 14672:2000(E) Introduction International Standard 12640, Graphic technology - Prepress digital data exchange - CMYK standard colour image data are intended for use in subjectively evaluating image quality as a function of image processing and/or output process. In addition, the synthetic images are provided to allow objective measurement of process control, tone reproduction, colour characterization, etc. In addition, these images may be used for the statistical evaluation of the change in image content as a function of image processing or other imaging steps. TC 130