1、 International Telecommunication Union ITU-T T.808TELECOMMUNICATION STANDARDIZATION SECTOR OF ITU Corrigendum 1(01/2007) SERIES T: TERMINALS FOR TELEMATIC SERVICES Information technology JPEG 2000 image coding system: Interactivity tools, APIs and protocols Technical Corrigendum 1 ITU-T Recommendati
2、on T.808 (2005) Technical Corrigendum 1 ITU-T Rec. T.808 (2005)/Cor.1 (01/2007) i INTERNATIONAL STANDARD ISO/IEC 15444-9 ITU-T RECOMMENDATION T.808 Information technology JPEG 2000 image coding system: Interactivity tools, APIs and protocols Technical Corrigendum 1 Summary ITU-T Rec. T.808 | ISO/IEC
3、 15444-9 specifies JPIP, the JPEG 2000 client/server communication protocol. Corrigendum 1 provides corrections and clarifications for the metadata transfers between the server and client and for the colour space method preferences. Source Corrigendum 1 to ITU-T Recommendation T.808 (2005) was appro
4、ved on 13 January 2007 by ITU-T Study Group 16 (2005-2008) under the ITU-T Recommendation A.8 procedure. An identical text is also published as Technical Corrigendum 1 to ISO/IEC 15444-9. ii ITU-T Rec. T.808 (2005)/Cor.1 (01/2007) FOREWORD The International Telecommunication Union (ITU) is the Unite
5、d Nations specialized agency in the field of telecommunications. The ITU Telecommunication Standardization Sector (ITU-T) is a permanent organ of ITU. ITU-T is responsible for studying technical, operating and tariff questions and issuing Recommendations on them with a view to standardizing telecomm
6、unications on a worldwide basis. The World Telecommunication Standardization Assembly (WTSA), which meets every four years, establishes the topics for study by the ITU-T study groups which, in turn, produce Recommendations on these topics. The approval of ITU-T Recommendations is covered by the proc
7、edure laid down in WTSA Resolution 1. In some areas of information technology which fall within ITU-Ts purview, the necessary standards are prepared on a collaborative basis with ISO and IEC. NOTE In this Recommendation, the expression “Administration“ is used for conciseness to indicate both a tele
8、communication administration and a recognized operating agency. Compliance with this Recommendation is voluntary. However, the Recommendation may contain certain mandatory provisions (to ensure e.g. interoperability or applicability) and compliance with the Recommendation is achieved when all of the
9、se mandatory provisions are met. The words “shall“ or some other obligatory language such as “must“ and the negative equivalents are used to express requirements. The use of such words does not suggest that compliance with the Recommendation is required of any party. INTELLECTUAL PROPERTY RIGHTS ITU
10、 draws attention to the possibility that the practice or implementation of this Recommendation may involve the use of a claimed Intellectual Property Right. ITU takes no position concerning the evidence, validity or applicability of claimed Intellectual Property Rights, whether asserted by ITU membe
11、rs or others outside of the Recommendation development process. As of the date of approval of this Recommendation, ITU had not received notice of intellectual property, protected by patents, which may be required to implement this Recommendation. However, implementers are cautioned that this may not
12、 represent the latest information and are therefore strongly urged to consult the TSB patent database at http:/www.itu.int/ITU-T/ipr/. ITU 2007 All rights reserved. No part of this publication may be reproduced, by any means whatsoever, without the prior written permission of ITU. ITU-T Rec. T.808 (
13、2005)/Cor.1 (01/2007) iii CONTENTS Page 1) Annex A.3.2.1 1 2) Annex A.3.3 1 3) Annex A.3.6.1 1 4) Annex C.3.4 1 5) Annex C.5.1 2 6) Annex C.7.2 2 7) Annex C.8.1.3 2 8) Annex C.10.2.3 2 ISO/IEC 15444-9:2005/Cor.1:2007 (E) ITU-T Rec. T.808 (2005)/Cor.1 (01/2007) 1 INTERNATIONAL STANDARD ITU-T RECOMMEN
14、DATION Information technology JPEG 2000 image coding system: Interactivity tools, APIs and protocols Technical Corrigendum 1 1) Annex A.3.2.1 Add the following note at the end of the clause: NOTE For the sake of efficiency when serving an image containing PPM markers, a server may transcode the pack
15、ed packet headers in the main header into the tile headers (PPT markers). Otherwise, a client would require tile-part length markers (TLM) to be sent. The server may alternatively transcode the image (transparently to the client) in such a way as to avoid the use of packed packet headers altogether.
16、 2) Annex A.3.3 Replace the sentence: This data bin may be formed from a legal codestream, by concatenating all marker segments except SOT and POC in all tile-part headers for tile n. with: This data bin may be formed from a legal codestream, by concatenating all marker segments except SOT in all ti
17、le-part headers for tile n. NOTE 1 POC marker segments may also be removed as they are not required by a typical JPIP client. However, a server might need to include the POC markers for a client application that was to output a JPEG 2000 file with the same progression order as the original image ava
18、ilable at the server. A server may send data in any order, but must send a tile header data bin for a tile even if the tile header is empty. NOTE 2 A client that receives image data for a tile but has not yet received its tile header should not assume that the tile header is empty and attempt to dec
19、ode the data. It might be beneficial for certain clients to receive the tile header bin in advance of the tile data bin. 3) Annex A.3.6.1 Add the following sentence at the end of the clause: A server is required to send at least the metadata bin with bin Id 0, even if no metadata is present. In this
20、 case, the metabin #0 will be empty. NOTE 2 A client should not assume that no metadata is available if it has not yet received any metadata bin. It might be beneficial for certain clients to receive the metadata bin with bin Id 0 in advance to all other bins. 4) Annex C.3.4 Add the following note a
21、t the end of the clause: NOTE The combination of “wait = yes“ with “cclose=*“ is not recommended. If this situation is encountered, the application can decide which of the two takes priority. ISO/IEC 15444-9:2005/Cor.1:2007 (E) 2 ITU-T Rec. T.808 (2005)/Cor.1 (01/2007) 5) Annex C.5.1 Replace the fol
22、lowing sentence at the end of the first paragraph: Where the server is aware of additional relevant metadata elements, it may deliver these as well. with the following note: NOTE The list of boxes defined in this clause is not exhaustive. Additional boxes may be required to decode the requested view
23、 window within the logical target correctly. 6) Annex C.7.2 Add the following note at the end of the clause: NOTE The combination of “wait = yes“ with “cclose=*“ is not recommended. If this situation is encountered, the application can decide which of the two takes priority. 7) Annex C.8.1.3 The fol
24、lowing sentence should be added to the beginning of the first paragraph: Implicit bin-descriptors are only applicable to JPP-stream requests. 8) Annex C.10.2.3 Change the contents of the boxes “Use unmodified value“ and “Use modified value“ of Figure C.3 as follows: Change: Use unmodified value prio
25、rityi = speci.APPROX + speci.PREC to: Use unmodified value priorityi = speci.APPROX + 256 speci.PREC Change: Use modified value priorityi = 1 + speci.PREC to: Use modified value priorityi = 257 speci.PREC The body of the text shall remain unaltered. Printed in Switzerland Geneva, 2007 SERIES OF ITU-
26、T RECOMMENDATIONS Series A Organization of the work of ITU-T Series D General tariff principles Series E Overall network operation, telephone service, service operation and human factors Series F Non-telephone telecommunication services Series G Transmission systems and media, digital systems and ne
27、tworks Series H Audiovisual and multimedia systems Series I Integrated services digital network Series J Cable networks and transmission of television, sound programme and other multimedia signals Series K Protection against interference Series L Construction, installation and protection of cables a
28、nd other elements of outside plant Series M Telecommunication management, including TMN and network maintenance Series N Maintenance: international sound programme and television transmission circuits Series O Specifications of measuring equipment Series P Telephone transmission quality, telephone i
29、nstallations, local line networks Series Q Switching and signalling Series R Telegraph transmission Series S Telegraph services terminal equipment Series T Terminals for telematic services Series U Telegraph switching Series V Data communication over the telephone network Series X Data networks, open system communications and security Series Y Global information infrastructure, Internet protocol aspects and next-generation networks Series Z Languages and general software aspects for telecommunication systems
