1、 International Telecommunication Union ITU-T T.807TELECOMMUNICATION STANDARDIZATION SECTOR OF ITU Amendment 1(03/2008) SERIES T: TERMINALS FOR TELEMATIC SERVICES Still-image compression JPEG 2000 Information technology JPEG 2000 image coding system: Secure JPEG 2000 Amendment 1: File format security
2、 Recommendation ITU-T T.807 (2006) Amendment 1 ITU-T T-SERIES RECOMMENDATIONS TERMINALS FOR TELEMATIC SERVICES Facsimile Framework T.0T.19 Still-image compression Test charts T.20T.29 Facsimile Group 3 protocols T.30T.39 Colour representation T.40T.49 Character coding T.50T.59 Facsimile Group 4 prot
3、ocols T.60T.69 Telematic services Framework T.70T.79 Still-image compression JPEG-1, Bi-level and JBIG T.80T.89 Telematic services ISDN Terminals and protocols T.90T.99 Videotext Framework T.100T.109 Data protocols for multimedia conferencing T.120T.149 Telewriting T.150T.159 Multimedia and hypermed
4、ia framework T.170T.189 Cooperative document handling T.190T.199 Telematic services Interworking T.300T.399 Open document architecture T.400T.429Document transfer and manipulation T.430T.449 Document application profile T.500T.509 Communication application profile T.510T.559 Telematic services Equip
5、ment characteristics T.560T.649 Still-image compression JPEG 2000 T.800T.849 Still-image compression JPEG-1 extensions T.850T.899 For further details, please refer to the list of ITU-T Recommendations. Rec. ITU-T T.807 (2006)/Amd.1 (03/2008) i INTERNATIONAL STANDARD ISO/IEC 15444-8 RECOMMENDATION IT
6、U-T T.807 Information technology JPEG 2000 image coding system: Secure JPEG 2000 Amendment 1 File format security Summary Amendment 1 to Rec. ITU-T T.807 | ISO/IEC 15444-8 specifies JPSEC file format derived from the ISO base file format and modifications to JPEG family file format (including JP2, J
7、PX and JPM) for protection and secure adaptation of scalable pictures, which is possibly encrypted and/or authenticated by the owner. The pictures could be either static pictures or time-sequenced pictures. In particular, the amendment provides functionality to do the following: To store coded media
8、 data corresponding to different scalability levels. Elementary stream (ES) is used for this purpose. To define tracks describing the characteristics of the coded media data stored in ES. For example, the track should be able to indicate scalability level (resolution, layer, region, etc.) and the ra
9、te-distortion hints of the coded media data in order to facilitate easy and secure adaptation. To define new file format boxes to signal protection tools and parameters applied to coded media data or metadata. The protection tools can be applied to either static JPEG 2000 pictures or time-sequenced
10、JPEG 2000 pictures. The protection tools defined in this amendment can be applied to JPEG family file formats including JP2, JPX and JPM and ISO-derived file formats such as MJ2 for motion JPEG. Source Amendment 1 to Recommendation ITU-T T.807 (2006) was approved on 15 March 2008 by ITU-T Study Grou
11、p 16 (2005-2008) under Recommendation ITU-T A.8 procedure. An identical text is also published as Amendment 1 to ISO/IEC 15444-8. ii Rec. ITU-T T.807 (2006)/Amd.1 (03/2008) FOREWORD The International Telecommunication Union (ITU) is the United Nations specialized agency in the field of telecommunica
12、tions, information and communication technologies (ICTs). 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 telecommunicati
13、ons 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 procedure l
14、aid 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 telecommuni
15、cation 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 these mand
16、atory 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 draws
17、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 members or o
18、thers 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 repres
19、ent the latest information and are therefore strongly urged to consult the TSB patent database at http:/www.itu.int/ITU-T/ipr/. ITU 2009 All rights reserved. No part of this publication may be reproduced, by any means whatsoever, without the prior written permission of ITU. ISO/IEC 15444-8:2007/Amd.
20、1:2009 (E) Rec. ITU-T T.807 (2006)/Amd.1 (03/2008) iii CONTENTS Page 1) Clause 2: Normative references . 1 2) Clause 3: Terms and definitions. 1 3) Annex E: File format security . 3 Annex E File Format Security 3 E.1 Scope 3 E.2 Introduction . 3 E.3 Extension to ISO base media file format 5 E.4 Elem
21、entary stream and sample definitions 14 E.5 Protection at file format level 16 E.6 Examples (Informative) 18 E.7 Boxes defined in ISO/IEC 15444-12 (informative) 28 ISO/IEC 15444-8:2007/Amd.1:2009 (E) Rec. ITU-T T.807 (2006)/Amd.1 (03/2008) 1 INTERNATIONAL STANDARD ISO/IEC 15444-8 RECOMMENDATION ITU-
22、T T.807 Information technology JPEG 2000 image coding system: Secure JPEG 2000 Amendment 1 File format security 1) Clause 2: Normative references Add the following references: Recommendation ITU-T T.803 (2002) | ISO/IEC 15444-4:2004, Information technology JPEG 2000 image coding system: Conformance
23、testing. ISO/IEC 13818-11:2004, Information technology Generic coding of moving pictures and associated audio information Part 11: IPMP on MPEG-2 systems. ISO/IEC 15444-6:2003, Information technology JPEG 2000 image coding system Part 6: Compound image file format. ISO/IEC 15444-12:2005, Information
24、 technology JPEG 2000 image coding system Part 12: ISO base media file format (technically identical to ISO/IEC 14496-12). 2) Clause 3: Terms and definitions a) Rewrite the first paragraph as follows (with the changes underlined): For the purposes of this Recommendation | International Standard, the
25、 following definitions apply. The definitions defined in ITU-T Rec. T.800 | ISO/IEC 15444-1 clause 3 and ISO/IEC 15444-12:2005 clause 3 apply to this Recommendation | International Standard. b) Add the following terms and definitions: Normal decoder Standard decoder is a process to decode a codestre
26、am that is fully compliant with the normative part of coding standard. Its behaviour is not defined if it tries to decode a non-compliant codestream. Adaptive-format decoder Adaptive-format decoder is a process to decode a codestream which is not fully compliant with the normative part of the coding
27、 standard. It shall reconstruct the media (possibly with low quality or resolution) even if the codestream has missing packets or inconsistent packet headers. For example, an adaptive-format decoder is able to understand a simply-transcoded codestream, such as the one that has its highest resolution
28、 packets removed. Elementary Stream (ES) Elementary streaming contains a sequence of samples, where each sample could be a video frame or a contiguous section of audio data. A sample in ES contains media data, ByteData structure, pointer structure, container structure, or any mixture of the above. S
29、elf-Contained ES Self-contained ES contains only media data, whose format is not defined in this amendment. The self-contained ES could be stored in MDAT box co-located with the file format specified in this amendment, or be stored in a separate file whose format is not specified by this amendment.
30、ISO/IEC 15444-8:2007/Amd.1:2009 (E) 2 Rec. ITU-T T.807 (2006)/Amd.1 (03/2008) Composed ES Composed ES may contain a mixture of ByteData, pointer and container structures, that is, its samples are composed with data from other elementary streams. A composed ES can either copy (using ByteData structur
31、e) or reference (using pointer) data from other ESes. Scalable Composed ES Scalable composed ES is made up of samples that may not be decodable by themselves. It may need to be combined with other scalable composed ESes to form a fully decodable codestream. Scalable composed ES is designed to suppor
32、t scalability, i.e., to make media data “thinable“. For example, for a motion JPEG 2000 codestream where each picture has three layers, it can be divided into 3 scalable composed ESes: the first one consists of all layer 0 data, the second one consists of all layer 1 data and the third one consists
33、of all layer 2 data. Decodable Composed ES Decodable composed ES is made up of samples that are decodable by themselves. It is designed for simple adaptation where the adaptor just needs to retrieve data pointed by pointer structure and remove the wrapper to form a fully scalable codestream. For exa
34、mple, for a motion JPEG 2000 codestream where each picture has three layers, it can form 3 decodable composed ESes: the first one consists of layer 0 data, the second one consists of layer 0 and layer 1 data and the third one consists of layer 0, 1 and 2 data. Adaptor/transcoder Adaptor/transcoder i
35、s a process to transform media data to lower scalability level, like lower resolution or lower quality or bit-rate, by removing portions of the file. The adaptor/transcoder can transform media data based on the information specified in this amendment. An adaptor/transcoder shall update byte offset v
36、alues in file format parameters that are impacted by the process. Secure adaptor/transcoder Secure adaptor/transcoder is a process to transform encrypted or authenticated media data without necessity to decrypt or regenerate the MAC or signature. Thus, end-to-end security remains for the transcoded
37、media data. JPEG 2000-aware adaptor/transcoder JPEG 2000-aware adaptor/transcoder combines one or more scalable composed ESes to form a fully decodable media codestream. It should have the capability to generate the headers and markers of media codestream and modify the packet index, such that the a
38、dapted codestream can be decoded by a normal decoder. It may also add empty packets to replace the removed ones, or it may insert POC marker. Simple adaptor/transcoder Simple adaptor/transcoder is able to transform data based on information specified by this amendment. It may not be capable of gener
39、ating media headers or modifying packet indices. It simply retrieves data pointed by pointer structure and removes the wrappers, and the resulting codestream can be decoded by adaptive-format decoder, which can cope with missing packets and inconsistent headers. Authentication adaptor/transcoder An
40、authentication adaptor/transcoder removes data that is not verifiable with the available media data and authentication data. For example, in a streaming system, some media packets may be lost during transmission. A file format receiver may reconstruct the received data to the best of its ability bas
41、ed on the available data. Then, an authentication adaptor/transcoder can determine which data can be verified, and then remove the packets that are not verified. The resulting file only contains the decodable, verified data. Container Container structure is used to wrap a sample in a composed ES. It
42、 might contain any number of ByteData or pointer structures, but is not allowed to contain another container structure. Pointer Pointer structure is used to reference a data segment in another ES. It must be contained inside a container structure. ISO/IEC 15444-8:2007/Amd.1:2009 (E) Rec. ITU-T T.807
43、 (2006)/Amd.1 (03/2008) 3 ByteData ByteData structure is used to wrap a data segment which is physically located in a composed ES. It must be contained inside a container structure. 4CC Code 4CC code is a 32-bit identifier, normally 4 printable characters. A 4CC code can be used to indicate the file
44、 type, the type of file format box, type of a file format track, type of a file format sample description and type of file format track reference. A 4CC code must be registered with a registration authority. 3) Annex E: File format security Create a new annex and add the following text: Annex E File
45、 Format Security (This annex forms an integral part of this Recommendation | International Standard) E.1 Scope This annex specifies JPSEC file format derived from the ISO base file format and modifications to JPEG family file format (including JP2, JPX and JPM) for protection and secure adaptation o
46、f scalable pictures, which is possibly encrypted and/or authenticated by the owner. The pictures could be either static pictures or time-sequenced pictures. In particular, this annex provides functionality to do the following: To store coded media data corresponding to different scalability levels.
47、Elementary stream (ES) is used for this purpose. There are three types of ESes, self-contained ES, scalable composed ES and decodable composed ES. To define tracks describing the characteristics of the coded media data stored in ES. For example, the track should be able to indicate scalability level
48、 (resolution, layer, region, etc.) and the rate-distortion hints of the coded media data in order to facilitate easy and secure adaptation. To define new file format boxes to signal protection tools and parameters applied to coded media data or metadata. The protection tools can be applied to either
49、 static JPEG 2000 pictures or time-sequenced JPEG 2000 pictures. The protection tools defined in this amendment can be applied to JPEG family file formats including JP2, JPX and JPM and ISO-derived file formats such as MJ2 for motion JPEG. E.2 Introduction E.2.1 Security protection at file format level This annex describes a JPSEC file format derived from the ISO base file format and modifications to JPEG family file format, to add security protection to JPEG 2000 pictures at the file format lev
