1、Information technology JPEG XR image coding system Part 5: Reference software AMENDMENT 1: Extension of the Reference Software: Support for the Boxed Based File Format Technologies de linformation Systme de codage dimage JPEG XR Partie 5: Logiciel de rfrence AMENDEMENT 1: Extension du logiciel de rf
2、rence: Support pour le format des fichiers bas sur les botes INTERNATIONAL STANDARD ISO/IEC 29199-5 Second edition 2012-03-15 Reference number ISO/IEC 29199-5:2012/Amd.1:2015(E) AMENDMENT 1 2015-11-15 ISO/IEC 2015 ii ISO/IEC 2015 All rights reserved COPYRIGHT PROTECTED DOCUMENT ISO/IEC 2015, Publish
3、ed in Switzerland All 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 written permission. Permissio
4、n can be requested from either ISO at the address below or ISOs member body in the country of the requester. ISO copyright office Ch. de Blandonnet 8 CP 401 CH-1214 Vernier, Geneva, Switzerland Tel. +41 22 749 01 11 Fax +41 22 749 09 47 copyrightiso.org www.iso.org ISO/IEC 29199-5:2012/Amd.1:2015(E)
5、 ISO/IEC 29199-5:2012/Amd.1:2015(E) Foreword ISO (the International Organization for Standardization) and IEC (the International Electrotechnical Commission) form the specialized system for worldwide standardization. National bodies that are members of ISO or IEC participate in the development of In
6、ternational Standards through technical committees established by the respective organization to deal with particular fields of technical activity. ISO and IEC technical committees collaborate in fields of mutual interest. Other international organizations, governmental and non-governmental, in liai
7、son with ISO and IEC, also take part in the work. In the field of information technology, ISO and IEC have established a joint technical committee, ISO/IEC JTC 1. The procedures used to develop this document and those intended for its further maintenance are described in the ISO/IEC Directives, Part
8、 1. In particular the different approval criteria needed for the different types of document should be noted. This document was drafted 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 elemen
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10、eceived (see www.iso.org/patents). Any trade name used in this document is information given for the convenience of users and does not constitute an endorsement. For an explanation on the meaning of ISO specific terms and expressions related to conformity assessment, as well as information about ISO
11、s adherence to the WTO principles in the Technical Barriers to Trade (TBT) see the following URL: Foreword - Supplementary information Amendment 1 to ISO/IEC 29199-5:2012 was prepared by Joint Technical Committee ISO/IEC JTC 1, Information technology, Subcommittee SC 29, Coding of audio, picture, mu
12、ltimedia and hypermedia information, in collaboration with ITU-T. This part of ISO/IEC 2 9 1 9 9 i s t e c h n i c a l l y a l i g n e d w i t h I T U - T R e c . T . 8 3 5 b u t i s n o t p u b l i s h e d a s identical text. ISO/IEC 2015 All rights reserved iii ISO/IEC 29199-5:2012/Amd.1:2015(E) I
13、ntroduction This Amendment updates the reference software to release 1.41 and addresses the following issues in the software: The pixel formats with 555/565/101010 bit red/green/blue bits for the red/green/blue channel cannot be decoded into the ppm file format. Attempting to do so with earlier rele
14、ases of the reference software caused a crash. The 1.41 fails gracefully if attempting to do so. The 1.32 release of the reference soft ware, previously published as Rec. ITU-T T.835 | ISO/IEC 29199- 5:2012, crashed if attempted to reconstruct an n-channel pixel format codestream with an interleaved
15、 alpha channel. This defect has been fixed with the 1.41 release of the software which reconstructs these files correctly. Release 1.32 of the software always encodes codestreams with the 555/565/101010 pixel format with the “red-blue-not-swapped” flag set, thus using the correct order of the compon
16、ents as required in earlier releases of Rec. ITU-T T.832 | ISO/IEC 29199-2. However, legacy encoders wrote red and blue in swapped order, with the “red-blue-not-swapped” flag cleared. It should be appreciated that some legacy applications cannot honour this flag correctly. The release 1.41 of the so
17、ftware again allows to write the red and blue channel in legacy order by including the command line option “-g”. Release 1.41 of the reference software adds support for the box-based format of JPEG XR which is specified in Rec. ITU-T T.801 | ISO/IEC 15444-2 (JPEG 2000 part 2) and thus supports two f
18、ile formats, the tag-based format specified in Rec. ITU-T T.832 | ISO/IEC 29199-2, and the box-based format in Rec. ITU-T T.801 | ISO/IEC 15444-2. AMD 3 of Rec. ITU-T T.801 | ISO/IEC 15444-2 defined a boxed-based file format for JPEG XR that is able to replace and extend the tag-based file format cu
19、rrently defined in Rec. ITU-T T.832 | ISO/IEC 29199-2: JPEG XR Image Coding System. This enhancement of the reference software will include support for the box-based file format and will thus support interested parties to implement new file format for JPEG XR by testing against the reference softwar
20、e. The updated reference software release 1.41 is available in the directory “Software” within this distribution as an electronic attachment.iv ISO/IEC 2015 All rights reserved Information technology JPEG XR image coding system Part 5: Reference software AMENDMENT 1: Extension of the Reference Softw
21、are: Support for the Boxed Based File Format Page 3, Clause 6.2.2 Add in clause 6.2.2. “Use of the sample encoder” the following paragraphs under “Supported options” in alphabetical order and renumber the notes accordingly.-gWhen this flag is present, red and blue components are swapped in 16bppBGR5
22、55, 16bppB- GR565 and 32bppBGR101010 pixel formats. NOTE 2 This only works for 16bppBGR555,16bppBGR565 and 32bppBGR101010 inputs. This changes the colour transform such that red and blue are interchanged. Some legacy implementations might require this ordering of components to decode images correctl
23、y for these formats only.-xWhen this flag is present, the encoder represents images in the box-based file format instead of the tag-based format. NOTE 5 The decoder recognizes both the ISO box-based file format and the tag-based format, there is no need to specify any flag to the decoder. Electronic
24、 Attachment Replace the electronic attachment to Rec. ITU-T T.835 | ISO/IEC 29199-5:2012 with the electronic attachment to this document. ISO/IEC 29199-5:2012/Amd.1:2015(E) ISO 2015 All rights reserved 1 ISO/IEC 29199-5:2012/Amd.1:2015(E) ISO/IEC 2015 All rights reserved IC S 35.040 Price based on 1 page
