SMPTE ST 2073-4-2015 VC-5 Video Essence - Part 4 Subsampled Color Difference Components.pdf
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1、 Copyright 2015 by THE SOCIETY OF MOTION PICTURE AND TELEVISION ENGINEERS 3 Barker Avenue, White Plains, NY 10601 (914) 761-1100 Approved January 2, 2015 99 Table of Contents Page Foreword . 3 Intellectual Property 3 Introduction 3 1 Scope 4 2 Conformance Notation 4 3 Normative References 4 4 Terms
2、and Definitions . 5 5 Notation . 5 6 Overview (Informative) 5 7 Image Structure 6 7.1 Sample Arrays . 6 7.2 Pattern Elements . 6 7.3 Color Difference Component Subsampling (Informative) . 6 7.4 Image Dimensions 7 7.5 Alpha Channel . 7 8 Bitstream Structure . 7 8.1 Component Array Count . 7 8.2 Compo
3、nent Array Dimensions 7 8.2.1 Luma Channel Dimensions . 7 8.2.2 Color Difference Component Dimensions 7 8.2.3 Alpha Channel Dimensions 7 8.3 Component Vector 8 8.4 Inverse Component Transform and Inverse Component Permutation (Informative) 8 9 Image Formats 9 9.1 Image Format Parameter 9 9.2 Channel
4、 Number Assignments (Informative) 9 10 Bitstream Syntax . 9 10.1 Bitstream Header . 9 10.2 Bitstream Restrictions 9 Page 1 of 18 pages SMPTE ST 2073-4:2015 SMPTE STANDARD VC-5 Video Essence Part 4: Subsampled Color Difference Components Subsampling SMPTE ST 2073-4:2015 Page 2 of 18 pages Annex A Cod
5、ec State Parameters (Normative) 10 A.1 Bitstream Extensions . 10 A.2 Parameter Descriptions . 10 A.2.1 AlphaSampling 10 A.3 Tag-Value Pairs . 10 Annex B Bitstream Structure (Informative) . 11 B.1 Components Per Sample 11 Annex C Common Image Formats (Informative) 12 Annex D Decoding Process (Informa
6、tive) 16 D.1 Alpha Channel Sampling 16 D.2 Canonical Component Order 16 D.3 Inverse Component Permutation 16 D.4 Image Repacking Process 16 Annex E Encoding Process (Informative) . 17 E.1 Image Unpacking Process 17 E.2 Forward Component Permutation 17 Annex F Bibliography (Informative) 18 Figures Fi
7、gure C.1 Sample array with 4:2:2 color difference component sub-sampling. 12 Figure C.2 Sample array with 4:2:0 color difference component sub-sampling. 13 Figure C.3 Sample array with 4:1:1 color difference component sub-sampling. 14 Figure C.4 Sample array with 4:1:0 color difference component sub
8、-sampling. 15 Tables Table 1 Color difference component subsampling specified by PatternWidth and PatternHeight. 6 Table A.1 Codec state parameters defined by this standard. 10 SMPTE ST 2073-4:2015 Page 3 of 18 pages Foreword SMPTE (the Society of Motion Picture and Television Engineers) is an inter
9、nationally-recognized standards developing organization. Headquartered and incorporated in the United States of America, SMPTE has members in over 80 countries on six continents. SMPTEs Engineering Documents, including Standards, Recommended Practices, and Engineering Guidelines, are prepared by SMP
10、TEs Technology Committees. Participation in these Committees is open to all with a bona fide interest in their work. SMPTE cooperates closely with other standards-developing organizations, including ISO, IEC and ITU. SMPTE Engineering Documents are drafted in accordance with the rules given in its S
11、tandards Operations Manual. SMPTE ST 2073-4 was prepared by Technology Committee 10E. Intellectual Property At the time of publication no notice had been received by SMPTE claiming patent rights essential to the implementation of this Engineering Document. However, attention is drawn to the possibil
12、ity that some of the elements of this document may be the subject of patent rights. SMPTE shall not be held responsible for identifying any or all such patent rights. Introduction This section is entirely informative and does not form an integral part of this Engineering Document. The VC-5 Elementar
13、y Bitstream defined in SMPTE ST 2073-1 encodes arrays of components as independent channels and does not specify the type of components that are represented in the bitstream. The VC-5 Image Formats defined in SMPTE ST 2073-3 describe image formats with the same number of components per sample. This
14、standard extends the image formats to include YC1C2(A) images with subsampled color difference components. The repetitive structure of subsampled color difference components is modeled using pattern elements, which were introduced in SMPTE ST 2073-3 for the purpose of describing the arrangement of c
15、olor components in CFA images. The default color space for YC1C2(A) images is defined in SMPTE ST 2073-3. SMPTE ST 2073-4:2015 Page 4 of 18 pages 1 Scope This standard extends the YC1C2(A) image format defined in SMPTE ST 2073-3 to include subsampled color difference components (including 4:2:2, 4:2
16、:0, 4:1:1, and 4:1:0). An alpha channel is optional and can have the same resolution as the Y channel or the same resolution as the C1 and C2 channels. This standard adds the AlphaSampling parameter to specify whether the alpha component is subsampled. Operations that resample color difference compo
17、nents are out of scope. 2 Conformance Notation Normative text is text that describes elements of the design that are indispensable or contains the conformance language keywords: “shall“, “should“, or “may“. Informative text is text that is potentially helpful to the user, but not indispensable, and
18、can be removed, changed, or added editorially without affecting interoperability. Informative text does not contain any conformance keywords. All text in this document is, by default, normative, except: the Introduction, any section explicitly labeled as “Informative“ or individual paragraphs that s
19、tart with “Note:” The keywords “shall“ and “shall not“ indicate requirements strictly to be followed in order to conform to the document and from which no deviation is permitted. The keywords, “should“ and “should not“ indicate that, among several possibilities, one is recommended as particularly su
20、itable, without mentioning or excluding others; or that a certain course of action is preferred but not necessarily required; or that (in the negative form) a certain possibility or course of action is deprecated but not prohibited. The keywords “may“ and “need not“ indicate courses of action permis
21、sible within the limits of the document. The keyword “reserved” indicates a provision that is not defined at this time, shall not be used, and may be defined in the future. The keyword “forbidden” indicates “reserved” and in addition indicates that the provision will never be defined in the future.
22、A conformant implementation according to this document is one that includes all mandatory provisions (“shall“) and, if implemented, all recommended provisions (“should“) as described. A conformant implementation need not implement optional provisions (“may“) and need not implement them as described.
23、 Unless otherwise specified, the order of precedence of the types of normative information in this document shall be as follows: Normative prose shall be the authoritative definition; Tables shall be next; followed by formal languages; then figures; and then any other language forms. 3 Normative Ref
24、erences The following standards contain provisions that, through reference in this text, constitute provisions of this standard. At the time of publication, the editions indicated were valid. All standards are subject to revision, and parties to agreements based on this standard are encouraged to in
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