1、Information technology Coding of audio-visual objects Part 4: Conformance testing AMENDMENT 21: Geometry and shadow conformanceAmendment 21:2009 (IDT) toNational Standard of CanadaCAN/CSA-ISO/IEC 14496-4-06(ISO/IEC 14496-4:2004, IDT)NOT FOR RESALE.PUBLICATION NON DESTINE LA REVENTE.CSA Standards Upd
2、ate ServiceAmendment 21:2009 toCAN/CSA-ISO/IEC 14496-4-06October 2009Title: Information technology Coding of audio-visual objects Part 4: Conformance testing AMENDMENT 21: Geometry and shadow conformancePagination: 12 pages (iii preliminary and 9 text)To register for e-mail notification about any up
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4、policy on privacy at www.csagroup.org/legal to find out how we protect your personal information.Reference numberISO/IEC 14496-4:2004/Amd.21:2008(E)ISO/IEC 2008INTERNATIONAL STANDARD ISO/IEC14496-4Second edition2004-12-15AMENDMENT 212008-06-01Information technology Coding of audio-visual objects Par
5、t 4: Conformance testing AMENDMENT 21: Geometry and shadow conformance Technologies de linformation Codage des objets audiovisuels Partie 4: Essai de conformit AMENDEMENT 21: Conformit de gomtrie et dombre ISO/IEC 14496-4:2004/Amd.21:2008(E) PDF disclaimer This PDF file may contain embedded typeface
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10、O copyright office Case postale 56 CH-1211 Geneva 20 Tel. + 41 22 749 01 11 Fax + 41 22 749 09 47 E-mail copyrightiso.org Web www.iso.org ii ISO/IEC 2008 All rights reservedAmendment 21:2009 toCAN/CSA-ISO/IEC 14496-4-06ISO/IEC 14496-4:2004/Amd.21:2008(E) ISO/IEC 2008 All rights reserved iiiForeword
11、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 International Standards through technical commi
12、ttees 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 liaison with ISO and IEC, also take part in the w
13、ork. In the field of information technology, ISO and IEC have established a joint technical committee, ISO/IEC JTC 1. International Standards are drafted in accordance with the rules given in the ISO/IEC Directives, Part 2. The main task of the joint technical committee is to prepare International S
14、tandards. Draft International Standards adopted by the joint technical committee are circulated to national bodies for voting. Publication as an International Standard requires approval by at least 75 % of the national bodies casting a vote. Attention is drawn to the possibility that some of the ele
15、ments of this document may be the subject of patent rights. ISO and IEC shall not be held responsible for identifying any or all such patent rights. Amendment 21 to ISO/IEC 14496-4:2004 was prepared by Joint Technical Committee ISO/IEC JTC 1, Information technology, Subcommittee SC 29, Coding of aud
16、io, picture, multimedia and hypermedia information. Amendment 21:2009 toCAN/CSA-ISO/IEC 14496-4-06ISO/IEC 14496-4:2004/Amd.21:2008(E) ISO/IEC 2008 All rights reserved 1Information technology Coding of audio-visual objects Part 4: Conformance testing AMENDMENT 21: Geometry and shadow conformance At t
17、he end of Table AMD 7-4 in 8.4.2.2.1, add the following table and renumber the first column: N Feature Reference of Test sequence and associated method 1 FootPrintSetNode CityDynamic FootPrintNode cityFootPrintLOD BuildingPartNode CityDynamic RoofNode CityDynamic FacadeNode CityDynamic 2 Shadow wind
18、mill.mp4 transparent.mp4 At the end of the Table in 8.4.2.3, add the following Table: Name Provider Content Original wrl file cityFootPrintStatic France Telecom FootPrintSetNode:The building footprints of a city. cityFootPrintStatic cityFootPrintStaticBuffer France Telecom FootPrintSetNode: The buil
19、ding footprints of a city. cityFootPrintStaticBuffer cityFootPrintLOD France Telecom FootPrintSetNode: The building footprints of a city with LOD. cityFootPrintLOD cityFootPrintLODBuffer France Telecom FootPrintSetNode:The building footprints of a city with LOD. cityFootPrintLODBuffer cityFootPrintL
20、OD_0_001 France Telecom FootPrintSetNode:The building footprints of a city with LOD using the compression based on the scene accuracy. cityFootPrintLOD_0_001 cityFootPrintLOD_0_001Buffer France Telecom FootPrintSetNode:The building footprints of a city with LOD using the compression based on the sce
21、ne accuracy. cityFootPrintLOD_0_001Buffer cityStatic France Telecom FootPrintSetNode:The 3D building of a city. cityStatic cityStaticBuffer France Telecom FootPrintSetNode:The 3D building of a city. cityStaticBuffer cityDynamic France Telecom FootPrintSetNode:The 3D building of a city with LOD using
22、 the compression based on the scene accuracy. cityDynamic cityDynamicBuffer France Telecom FootPrintSetNode:The 3D building of a city with LOD using the compression based on the scene accuracy. cityDynamicBuffer Amendment 21:2009 toCAN/CSA-ISO/IEC 14496-4-06ISO/IEC 14496-4:2004/Amd.21:2008(E) 2 ISO/
23、IEC 2008 All rights reservedHouse France Telecom FootPrintSetNode:The complex 3D model of a house. House windmill.mp4 University ofIlmenau Shadow: Animated windmill, that casts shadows on the ground windmill.wrl transparent.mp4 University ofIlmenau Shadow: Several cubes with different transparency c
24、ast shadows on the ground transparent.wrl After 8.5.13, add the following subclause: 8.5.14 Multiresolution footprint-based coding 8.5.14.1 Introduction Some 3D models such as buildings can be well-compressed using a footprint-based representation. To allow an adaptive streaming of huge models, this
25、 coding is based on a multi-resolution schema well-suited for graphics on-demand transmission. For the specific case of building models, a procedural representation is available to encode complex facades and roofs. Due to its compression, the multi-resolution footprint-based coding is actually one o
26、f the best way to transmit huge city models for geo-visualization applications. 8.5.14.2 Conformance Points (Covered functionalities) The conformance points for the multiresolution footprint based representation cover the different object type (0=footprint, 1=building), the static (with one level of
27、 detail) or dynamic scene (with several levels of detail), the compression based on the accuracy of the scene, the different fields use in the Bitwrapper node (url or BUFFER), the swap nodes used in building mode (allowing to replace the encoded building by a more complex indexedFaceSet), the facade
28、s reconstruction with textures or 3D models, the complex roofs reconstruction with simple roof superimposition. The following subclauses specify the normative tests for verifying conformance of the multiresolution footprint based representation. Those normative tests make use of test data (bitstream
29、 test suites). 8.5.14.3 Bitstream conformance 8.5.14.3.1 Conformance Requirements BIFS streams shall comply with the specifications in subclause 4.3.6 of ISO/IEC 14496-16:2006 and BitWrapper in ISO/IEC 14496-11. 8.5.14.3.2 Measurement procedure BIFS streams shall comply with the specifications in su
30、bclause 4.3.6 of ISO/IEC 14496-16:2006 and BitWrapper in ISO/IEC 14496-11. 8.5.14.3.3 Tolerance There is no tolerance for bitstream syntax checking. The diagnosis is pass or fail. 8.5.14.4 Terminal conformance 8.5.14.4.1 Conformance Requirements A compliant decoder shall implement a decoding process
31、 that is equivalent to the one specified in ISO/IEC 14496-16 and meets all the general requirements, defined in the document, which apply for the functionalities considered. The decoder shall decode bitstreams with any options or parameters with values permitted for the functionalities. In the case
32、of using BIFS for scene representation, the decoding process that is specified in ISO/IEC 14496-1:2004 shall also be implemented. Amendment 21:2009 toCAN/CSA-ISO/IEC 14496-4-06ISO/IEC 14496-4:2004/Amd.21:2008(E) ISO/IEC 2008 All rights reserved 38.5.14.4.2 Test Bitstreams Files: Test Name Attribute
33、Bitstream (.mp4) Reference file (.txt) Standalone_URL Use of URL field in the Bitwrapper node. Entire object coded at once. Standalone_URL Standalone_URL Standalone_Buffer Use of URL field in the Bitwrapper node. Entire object coded at once. Standalone_Buffer Standalone_Buffer Partial_URL Use of URL
34、 in the Bitwrapper node. Partially encoded object. Partial_URL Partial_URL Partial_BUFFER Use of BUFFER in the Bitwrapper node. Partially encoded object. Partial_BUFFER Partial_BUFFER Progressive_URL Use of URL in the Bitwrapper node. Refinement to Partial_URL. Progressive_URL Progressive_URL Progre
35、ssive_BUFFER Use of BUFFER in the Bitwrapper node. Refinement to Partial_Buffer. Progressive_BUFFER Progressive_BUFFER 8.5.14.4.3 Measurement procedure The terminal should produce a formatted output giving the reconstructed 3D object with the available refinement Elementary Streams. 8.5.14.4.4 Toler
36、ance The conformance is passed when the reconstructed 3D object reflects the correct 3D object, as defined in ISO/IEC 14496-16. The rendering functionality must be observed visually. 8.5.15 3DMC extension 8.5.15.1 Introduction The 3D mesh object is a 3D polygonal model that can be represented as an
37、IndexedFaceSet in BIFS. It is defined by the position of its vertices (geometry), by the association between each face and its sustaining vertices (connectivity), and optionally by colours, normals, and texture coordinates (properties). Properties do not affect the 3D geometry, but influence the way
38、 the model is shaded. 3D mesh coding (3DMC) extension addresses the efficient coding of 3D mesh object. It comprises a basic method and several options. The basic 3DMC extension method operates on manifold model and features incremental representation of single resolution 3D model. The model may be
39、triangular or polygonal the latter are triangulated for coding purposes and are fully recovered in the decoder. Options include: (a) support for error resilience; (b) vertex order and face order preserving; (c) efficient texture mapping; and (d) support for non-manifold and non-orientable model. Ame
40、ndment 21:2009 toCAN/CSA-ISO/IEC 14496-4-06ISO/IEC 14496-4:2004/Amd.21:2008(E) 4 ISO/IEC 2008 All rights reserved8.5.15.2 Conformance Points 8.5.15.2.1 Covered functionalities The conformance points for compression of 3DMC extension cover basic compression, backward compatibility, forward compatibil
41、ity, error resilience support, backward compatibility with error resilience, forward compatibility with error resilience, vertex order and face order preserving, support of non-manifold/non-orientable model (stitch), and efficient texture mapping. These functionalities relate to the compressed repre
42、sentation of IndexedFaceSet node carried by BitWrapper node as described in ISO/IEC 14496-11. As for carriage of compressed representation IndexedFaceSet node using BitWrapper node, it can be carried either in a separate stream or within the scene stream (BIFS stream). Therefore, compression of 3DMC
43、 extension also shall be tested together with this node. The following subclauses specify the normative tests for verifying conformance of 3DMC extension compressed bitstreams and 3DMC extension decoder. Those normative tests make use of test data (bitstream test suites). 8.5.15.3 Bitstream conforma
44、nce 8.5.15.3.1 Conformance Requirements BIFS streams shall comply with the specifications for compression of 3DMC extension in ISO/IEC 14496-16 and BitWrapper in ISO/IEC 14496-11. 8.5.15.3.2 Measurement procedure Syntax of the BIFS stream shall meet the requirements of compression of 3DMC extension
45、in ISO/IEC 14496-16 and BitWrapper in ISO/IEC 14496-11. 8.5.15.3.3 Tolerance There is no tolerance for bitstream syntax checking. The diagnosis is pass or fail. 8.5.15.4 Terminal conformance 8.5.15.4.1 Conformance Requirements A compliant decoder shall implement a decoding process that is equivalent
46、 to the one specified in ISO/IEC 14496-16 and meets all the general requirements, defined in the document, which apply for the functionalities considered. The decoder shall decode bitstreams with any options or parameters with values permitted for the functionalities. In the case of using BIFS for s
47、cene representation, the decoding process that is specified in ISO/IEC 14496-1:2004 shall also be implemented. 8.5.15.4.2 Test Bitstreams Purpose 1 (URL): Exercise the basic compression, backward compatibility, forward compatibility, error resilience support, backward compatibility with error resili
48、ence, forward compatibility with error resilience, vertex order and face order preserving, support of non-manifold/non-orientable model (stitch), and efficient texture mapping functionalities of MPEG-4 3DMC extension compression carried in a separate stream from the scene stream. Purpose 2 (Buffer):
49、 Exercise the basic compression, backward compatibility, forward compatibility, error resilience support, backward compatibility with error resilience, forward compatibility with error resilience, vertex order and face order preserving, support of non-manifold/non-orientable model (stitch), and efficient texture mapping functionalities of MPEG-4 3DMC extension compression carried in a BIFS scene stream. Amendment 21:2009 toCAN/CSA-ISO/IEC 14496-4-06ISO/IEC 14496-4:2004/Amd.21:2008(E) ISO/IEC 2008 All rights reserved 5
