1、 I n t e r n a t i o n a l T e l e c o m m u n i c a t i o n U n i o n ITU-T T.834 TELECOMMUNICATION STANDARDIZATION SECTOR OF ITU (10/2014) SERIES T: TERMINALS FOR TELEMATIC SERVICES Still-image compression | JPEG XR Information technology JPEG XR image coding system Conformance testing Recommendat
2、ion ITU-T T.834 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 protocols T.60T.69 Telematic servic
3、es 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 hypermedia framework T.170T.189 Coopera
4、tive document handling T.190T.199 Telematic services Interworking T.300T.399 Open document architecture T.400T.429 Document transfer and manipulation T.430T.449 Document application profile T.500T.509 Communication application profile T.510T.559 Telematic services Equipment characteristics T.560T.64
5、9 Still-image compression JPEG 2000 T.800T.829 Still-image compression | JPEG XR T.830T.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.834 (10/2014) i Recommendation ITU-T T.834 Information technology JPEG
6、 XR image coding system Conformance testing Summary Recommendation ITU-T T.834 has been developed jointly with ISO/IEC JTC 1 SC 29/WG 1 in a collaborative team that is referred to as the Joint Photographic Experts Group (JPEG). It will be published as a technically-aligned twin text by both organiza
7、tions (ITU-T and ISO/IEC). This Recommendation | International Standard specifies tests designed to verify whether codestreams, files, encoders and decoders meet the normative requirements specified in Rec. ITU-T T.832 | ISO/IEC 29199-2 (Information technology JPEG XR image coding system Image codin
8、g specification). A codestream (or file) can be claimed to conform to Rec. ITU-T T.832 | ISO/IEC 29199-2 if it meets the normative requirements for such codestreams (or file) specified in Rec. ITU-T T.832 | ISO/IEC 29199-2. An encoder can be claimed to have codestream (or file format) conformance to
9、 Rec. ITU-T T.832 | ISO/IEC 29199-2 if the codestreams (or files) that it generates are conforming codestreams (or files). A decoder can be claimed to conform to a specified subset of Rec. ITU-T T.832 | ISO/IEC 29199-2 capabilities (such as a combination of “profile“ and “level“ capabilities) if it
10、can properly decode all codestreams (or files) obeying the constraints specified in Rec. ITU-T T.832 | ISO/IEC 29199-2 for the specified subset of capabilities. The tests specified in this Recommendation | International Standard provide methods for (non-exhaustive) testing of whether encoders and de
11、coders meet these requirements. This enhancement of Rec. ITU.T T.834 | ISO/IEC 29199-4 extends and enhances the set of test streams for Rec. ITU-T T.832 | ISO/IEC 29199-2 in two ways: First, additional test streams cover features than had either not yet been tested in earlier revisions or did not ex
12、ist in earlier versions in the standard. Second, extensions made to the JPEG 2000 file format of Rec. ITU-T T.802 | ISO/IEC 15444-2 allow the wrapping of JPEG XR codestreams in the JPEG 2000 file format, for which new reference streams are included. A set of data for use in such tests is provided as
13、 an electronic attachment to this Recommendation | International Standard and is an integral part thereof. This data set is also available for download from the ITU-T Test Signal Database at: http:/itu.int/net/ITU-T/sigdb/speimage/Tseries-s.htm#T.834. History Edition Recommendation Approval Study Gr
14、oup Unique ID* 1.0 ITU-T T.834 2010-01-13 16 11.1002/1000/10648 2.0 ITU-T T.834 2014-10-14 16 11.1002/1000/12305 _ * To access the Recommendation, type the URL http:/handle.itu.int/ in the address field of your web browser, followed by the Recommendations unique ID. For example, http:/handle.itu.int
15、/11.1002/1000/11830-en. ii Rec. ITU-T T.834 (10/2014) FOREWORD The International Telecommunication Union (ITU) is the United Nations specialized agency in the field of telecommunications, information and communication technologies (ICTs). The ITU Telecommunication Standardization Sector (ITU-T) is a
16、 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 telecommunications on a worldwide basis. The World Telecommunication Standardization Assembly (WTSA), which meets every four years, es
17、tablishes 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 laid down in WTSA Resolution 1. In some areas of information technology which fall within ITU-Ts purview, the necessary
18、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 telecommunication administration and a recognized operating agency. Compliance with this Recommendation is voluntary. However, the
19、 Recommendation may contain certain mandatory provisions (to ensure, e.g., interoperability or applicability) and compliance with the Recommendation is achieved when all of these mandatory provisions are met. The words “shall“ or some other obligatory language such as “must“ and the negative equival
20、ents 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 RIGHTSITU draws attention to the possibility that the practice or implementation of this Recommendation may involve the use of a claim
21、ed Intellectual Property Right. ITU takes no position concerning the evidence, validity or applicability of claimed Intellectual Property Rights, whether asserted by ITU members or others outside of the Recommendation development process. As of the date of approval of this Recommendation, ITU had re
22、ceived notice of intellectual property, protected by patents, which may be required to implement this Recommendation. However, implementers are cautioned that this may not represent the latest information and are therefore strongly urged to consult the TSB patent database at http:/www.itu.int/ITU-T/
23、ipr/. ITU 2015 All rights reserved. No part of this publication may be reproduced, by any means whatsoever, without the prior written permission of ITU. Rec. ITU-T T.834 (10/2014) iii CONTENTS Page 1 Scope 1 2 Normative references 1 2.1 Identical Recommendations | International Standards 1 2.2 Paire
24、d Recommendations | International Standards equivalent in technical content . 1 2.3 Additional references 1 3 Definitions 1 4 Abbreviations . 2 5 Conventions 2 6 Conformance testing specification . 2 6.1 General 2 6.2 Procedure to test codestreams (or files). 3 6.3 Procedure to test encoders . 3 6.4
25、 Procedure to test decoders . 3 7 Reference data set . 4 7.1 General 4 7.2 Reference file set BasicAndOverlap_1x1Tile . 4 7.3 Reference file set BasicAndOverlap_4x4Tile . 5 7.4 Reference file set BasicAndOverlap_2x2Tile . 6 7.5 Reference file set BandsPresent_1x1Tile 6 7.6 Reference file set BandsPr
26、esent_4x4Tile 7 7.7 Reference file set Varied_QP 7 7.8 Reference file set Varied_Internal_Color_Format 8 7.9 Reference file set Output_Bitdepth_16 . 8 7.10 Reference file set Special_QP . 9 7.11 Reference file set Flags_And_Tiles 9 7.12 Reference file set Entropy_Table_Coverage . 10 7.13 Reference f
27、ile set Shift_Bits 11 7.14 Reference file set MBLevel_QP_Coverage 11 7.15 Reference file set Output_Color_Format_Baseline . 12 7.16 Reference file set Output_Color_Format_Main 12 7.17 Reference file set Output_Color_Format_Advanced 14 7.18 Reference file set Alpha_Interleaved 15 7.19 Reference file
28、set Hard_Tile_Boundaries . 15 7.20 Reference file set Index_Table_Use 17 7.21 Reference file set Levels . 17 7.22 Reference file set Long_Word_Flag . 18 7.23 Reference file set Windowing . 18 7.24 Reference file set Chroma_Centering . 19 7.25 Reference file set Tag_Based_Container 19 7.26 Reference
29、file set Tile_Sizes . 20 7.27 Reference file set Red-Blue-Not-Swapped . 20 7.28 Reference file set Use-DCLP-QP-Flag . 21 7.29 Reference file set Trim-Flexbits 21 7.30 Reference file set Spatial_XFRM 21 7.31 Reference file set BoxBased-Format . 22 iv Rec. ITU-T T.834 (10/2014) Foreword This Recommend
30、ation | International Standard specifies tests designed to verify whether codestreams, files, encoders and decoders meet the normative requirements specified in Rec. ITU-T T.832 | ISO/IEC 29199-2 (Information technology JPEG XR image coding system Image coding specification). A set of data for use i
31、n such tests is provided as an electronic attachment to this Recommendation | International Standard and is considered an integral part thereof. Introduction This Recommendation | International Standard has been developed by ITU-T and ISO/IEC in a collaborative team that is referred to as the Joint
32、Photographic Experts Group (JPEG). It is published as a technically-aligned twin text by both organizations (ITU-T and ISO/IEC). This Recommendation | International Standard specifies a set of tests designed to verify whether codestreams, files, encoders and decoders meet the normative requirements
33、specified in Rec. ITU-T T.832 | ISO/IEC 29199-2 (Information technology JPEG XR image coding system Image coding specification). A codestream (or file) can be claimed to conform to Rec. ITU-T T.832 | ISO/IEC 29199-2 if it meets the normative requirements for such codestreams (or file) specified in R
34、ec. ITU-T T.832 | ISO/IEC 29199-2. An encoder can be claimed to have codestream (or file format) conformance to Rec. ITU-T T.832 | ISO/IEC 29199-2 if the codestreams (or files) that it generates are conforming codestreams (or files). A decoder can be claimed to conform to a specified subset of Rec.
35、ITU-T T.832 | ISO/IEC 29199-2 capabilities (such as a combination of “profile“ and “level“ capabilities) if it can properly decode all codestreams (or files) obeying the constraints specified in Rec. ITU-T T.832 | ISO/IEC 29199-2 for the specified subset of capabilities. The tests specified in this
36、Recommendation | International Standard provide methods for (non-exhaustive) testing of whether encoders and decoders meet these requirements. Characteristics of codestreams, files and decoders are specified in Rec. ITU-T T.832 | ISO/IEC 29199-2. The characteristics of a codestream (or file) indicat
37、e the subset of that standard that is exploited within the codestream (or file). Examples are the selected values of the image size and number of associated colour components. Decoder characteristics specify the properties and capabilities of the applied decoding process. The capabilities of a decod
38、er specify which codestreams (or files) the decoder can decode by specifying the subset of Rec. ITU-T T.832 | ISO/IEC 29199-2 syntax features and values that may be exploited in the codestreams (or files) that it will decode. A codestream (or file) can be decoded by a conforming decoder if it is a c
39、onforming codestream (or file) and the characteristics of the codestream (or file) are within the subset of the standard that is specified by the decoder capabilities. Procedures are specified in this Recommendation | International Standard for testing the conformance of codestreams (or files) and d
40、ecoders to the requirements specified in Rec. ITU-T T.832 | ISO/IEC 29199-2. Given the set of characteristics claimed, the requirements that shall be met are fully determined by Rec. ITU-T T.832 | ISO/IEC 29199-2. This Recommendation | International Standard summarizes these requirements, cross refe
41、rences them to characteristics, and specifies how conformance to them can be tested. Particular tests to verify codestream and decoder conformance are specified. A set of data for use in such tests is provided as an electronic attachment to this Recommendation | International Standard and is conside
42、red an integral part thereof. When a decoder under test does not satisfy the requirements of the specified tests when operating on the provided data set, the decoder is indicated not to conform to Rec. ITU-T T.832 | ISO/IEC 29199-2. The specified testing of codestreams (or files) produced by encoder
43、s employs the reference software decoder specified in Rec. ITU-T T.835 | ISO/IEC 29199-5 (with source code available in electronic format). When a codestream (or file) cannot be decoded by the reference software decoder without generating non-conformance warning messages, the codestream (or file) is
44、 indicated not to conform to Rec. ITU-T T.832 | ISO/IEC 29199-2. When an encoder produces any such codestreams (or files) that cannot be decoded without warnings by the reference software decoder, the encoder is indicated not to conform to Rec. ITU-T T.832 | ISO/IEC 29199-2. Rec. ITU-T T.834 (10/201
45、4) 1 Recommendation ITU-T T.834 Information technology JPEG XR image coding system Conformance testing 1 Scope This Recommendation | International Standard specifies a set of tests designed to verify whether codestreams, files, encoders and decoders meet the normative requirements specified in Rec.
46、ITU-T T.832 | ISO/IEC 29199-2 (Information technology JPEG XR image coding system Image coding specification). 2 Normative references The following Recommendations and International Standards contain provisions which, through reference in this text, constitute provisions of this Recommendation | Int
47、ernational Standard. At the time of publication, the editions indicated were valid. All Recommendations and Standards are subject to revision, and parties to agreements based on this Recommendation | International Standard are encouraged to investigate the possibility of applying the most recent edi
48、tion of the Recommendations and Standards listed below. Members of IEC and ISO maintain registers of currently valid International Standards. The Telecommunication Standardization Bureau of the ITU maintains a list of currently valid ITU-T Recommendations. 2.1 Identical Recommendations | Internation
49、al Standards Recommendation ITU-T T.801 (2002) | ISO/IEC 15444-2:2004, Information technology JPEG 2000 image coding system: Extensions and its subsequent amendments and corrigenda, namely: Cor. 3 (2005), Cor. 4 (2006), Amd. 2 (2005), Amd. 4 (2012) and Amd. 3 (2013). 2.2 Paired Recommendations | International Standards equivalent in technical content Recommendation ITU-T T.832 (2012) | ISO/IEC 29199-2:2012, Information technology JPEG XR image coding s
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