SMPTE ST 2066-2012 Disparity Map Representation for Stereoscopic 3D.pdf

1、 Copyright 2012 by THE SOCIETY OF MOTION PICTURE AND TELEVISION ENGINEERS 3 Barker Avenue, White Plains, NY 10601 (914) 761-1100 Approved August 2, 2012 Table of Contents Page Foreword . 2 Intellectual Property 2 Introduction 2 1 Scope . 3 2 Conformance Notation . 3 3 Definitions and Acronyms 3 3.1

2、Disparity Units (DU) . 3 3.2 Disparity Value . 4 3.3 Disparity Map . 4 3.4 Vertical Misalignment . 4 4 Disparity Value Representation . 4 5 Disparity Map Characteristics 4 5.1 Map Width 5 5.2 Map Height . 5 5.3 Map Image Tag 5 6 Special Values . 5 6.1 Unknown 5 Annex A Bibliography (Informative) . 6

3、 Page 1 of 6 pages SMPTE ST 2066:2012 SMPTE STANDARD Disparity Map Representation for Stereoscopic 3D SMPTE ST 2066:2012 Page 2 of 6 pages Foreword SMPTE (the Society of Motion Picture and Television Engineers) is an internationally-recognized standards developing organization. Headquartered and inc

4、orporated 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 SMPTEs Technology Committees. Participation in these Committees is open to all wi

5、th 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 Part XIII of its Operations Manual. SMPTE ST 2066 was prepared by Technology Commit

6、tee 10E. Intellectual Property SMPTE draws attention to the fact that it is claimed that compliance with this Standard may involve the use of one or more patents or other intellectual property rights (collectively, “IPR“). The Society takes no position concerning the evidence, validity, or scope of

7、this IPR. Each holder of claimed IPR has assured the Society that it is willing to License all IPR it owns, and any third party IPR it has the right to sublicense, that is essential to the implementation of this Standard to those (Members and non-Members alike) desiring to implement this Standard un

8、der reasonable terms and conditions, demonstrably free of discrimination. Each holder of claimed IPR has filed a statement to such effect with SMPTE. Information may be obtained from the Director, Standards or that a certain course of action is preferred but not necessarily required; or that (in the

9、 negative form) a certain possibility or course of action is deprecated but not prohibited. The keywords “may“ and “need not“ indicate courses of action permissible within the limits of the document. The keyword “reserved” indicates a provision that is not defined at this time, shall not be used, an

10、d 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. A conformant implementation according to this document is one that includes all mandatory provisions (“shall“) and, if implemented, all rec

11、ommended provisions (“should“) as described. A conformant implementation need not implement optional provisions (“may“) and need not implement them as described. Unless otherwise specified, the order of precedence of the types of normative information in this document shall be as follows: Normative

12、prose shall be the authoritative definition; Tables shall be next; followed by formal languages; then figures; and then any other language forms 3 Definitions and Acronyms The following definitions are used in this document: 3.1 Disparity Units DU Disparity Units are an image-width referenced measur

13、e used to represent disparities in a stereoscopic image pair. The full width of a stereoscopic image shall be defined as 61440 Disparity Units. Thus, for an image that is w pixels wide, each pixel would have a width of 61440/w Disparity Units, which is an integer for the image widths of 1280, 1920,

14、2048, 3840, 4096, and 7680 pixels for the image formats defined in SMPTE ST 274, SMPTE ST 296, SMPTE ST 2036-1 and SMPTE ST 2048-1. SMPTE ST 2066:2012 Page 4 of 6 pages By this definition, a Disparity Value represented as an integer number of Disparity Units has a precision of w/61440 pixels. For ex

15、ample, in a stereoscopic image that is 1280 pixels wide, a value represented by Disparity Units has a precision of 1/48th pixel. Note: The constant 61440 is the least common multiple (LCM) of the common image widths 1280, 1920, 2048, 3840, 4096, and 7680 pixels. 3.2 Disparity Value a Disparity Value

16、 is the horizontal displacement between corresponding points in a stereoscopic image pair, measured in Disparity Units, from a point in the left-eye image plane*When one or the other of the corresponding points in the image plane is outside the image itself, as can occur near the right and left edge

17、s of the image, the actual Disparity Units measure of the Disparity Value for the point inside the image, if known, should be provided. to the corresponding point in the right-eye image plane, with displacement to the right being positive; except when the distance between the corresponding points is

18、 not known, in which case the Disparity Value is an appropriate special value as defined in Section 6. When both of the corresponding points in the image plane are within the image, but a foreground object hides one or the other, the actual Disparity Unit measure of the Disparity Value for the non-h

19、idden point, if known, should be provided. 3.3 Disparity Map a Disparity Map is an array representing multiple Disparity Values corresponding to a particular one of the images in the stereoscopic image pair, and the metadata necessary to interpret the representation. 3.4 Vertical Misalignment Vertic

20、al Misalignment as used herein is defined as vertical deviation between corresponding points. Note: These disparity maps represent only horizontal disparity and thus presume that the corresponding stereoscopic image pairs have no Vertical Misalignment. 4 Disparity Value Representation The range of p

21、ossible Disparity Values, not including the special values defined in Section 6, is the interval -61440, +61440, requiring at least a 17-bit representation. Note: A Disparity Value will be substantially the same sign and value when measured with respect to either image. The sign does not reverse whe

22、n measuring from the right-eye or left-eye image. 5 Disparity Map Characteristics The following characteristics shall be provided to govern the interpretation of Disparity Values as represented in a Disparity Map. *Here, an “image plane” is the infinite mathematical plane within which the finite rec

23、tangle of the image resides. The coordinate axes of this plane are the same as those used to define pixel coordinates within the image. By this definition, a corresponding point can exist outside the extent of an image. SMPTE ST 2066:2012 Page 5 of 6 pages 5.1 Map Width An unsigned integer represent

24、ing the number of columns in the Disparity Map. A Disparity Map shall be the same width as the corresponding images. 5.2 Map Height An unsigned integer representing the number of rows in the Disparity Map. A Disparity Map shall be the same height as the corresponding images. 5.3 Map Image Tag A sing

25、le character, R or L, indicating respectively whether a Disparity Map represents disparities from the right-eye or left-eye image of the image pair. 6 Special Values Special values shall not be considered to represent disparity, but shall be interpreted to represent the following condition at the co

26、rresponding image pixel(s): 6.1 Unknown The value 0x0FFFF (65535) shall represent an unknown Disparity Value Note: The value 0x0FFFF is intended as a 17-bit value. SMPTE ST 2066:2012 Page 6 of 6 pages Annex A Bibliography (Informative) Note: All references in this document to other SMPTE documents u

27、se the current numbering style (e.g. SMPTE ST 274:2008) although, during a transitional phase, the document as published (printed or PDF) may bear an older designation (such as SMPTE 274M-2008). Documents with the same root number (e.g. 274) and publication year (e.g. 2008) are functionally identica

28、l. 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 investi

29、gate the possibility of applying the most recent edition of the standards indicated below. The following documents are among those consulted in deriving the requirements addressed by this standard: REPORT OF SMPTE TASK FORCE ON 3D TO THE HOME, Society of Motion Picture and Television Engineers, 2009

30、 In particular, these standards describe the image resolutions supported by this standard: SMPTE ST 274:2008, Television 19201080 Image Sample Structure, Digital Representation and Digital Timing Reference Sequences for Multiple Picture Rates SMPTE ST 296:2012, 1280720 Progressive Image Sample Structure Analog and Digital Representation and Analog Interface SMPTE ST 2036-1:2009, Ultra High Definition Television Image Parameter Values for Program Production SMPTE ST 2048-1:2011, 20481080 and 40962160 Digital Cinematography Production Image Formats FS/709