ISO/IEC 23090-6:2021/Amd 1:2024

International
Standard
ISO/IEC 23090-6
First edition
Information technology — Coded
2021-06
representation of immersive
media —
AMENDMENT 1
2024-01
Part 6:
Immersive media metrics
AMENDMENT 1: Immersive media
metrics for V3C Data and OMAF
Reference number
ISO/IEC 23090-6:2021/Amd. 1:2024(en) © ISO/IEC 2024

ISO/IEC 23090-6:2021/Amd. 1:2024(en)
© ISO/IEC 2024
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© ISO/IEC 2024 – All rights reserved
ii
ISO/IEC 23090-6:2021/Amd. 1:2024(en)
Foreword
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This document was prepared by Joint Technical Committee ISO/IEC JTC 1, Information technology,
Subcommittee SC 29, Coding of audio, picture, multimedia and hypermedia information.
A list of all parts in the ISO/IEC 23090 series can be found on the ISO and IEC websites.
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© ISO/IEC 2024 – All rights reserved
iii
ISO/IEC 23090-6:2021/Amd. 1:2024(en)
Information technology — Coded representation of
immersive media —
Part 6:
Immersive media metrics
AMENDMENT 1: Immersive media metrics for V3C Data and
OMAF
Normative references
Add the following reference:
ISO/IEC 23090-10, Coded representation of immersive media — Part 10: Carriage of visual volumetric video-
based coding data
Terms and definitions
Replace the first sentence with: "For the purposes of this document, the terms and definitions given in
ISO/IEC 23090-10 apply."
Clause 4
Add the following abbreviated terms:
3DoF Three Degrees of Freedom
6DoF Six Degrees of Freedom
V3C Visual Volumetric Video-based Coding (ISO/IEC 23090-10)

6.1, first paragraph
Replace the third sentence with the following:
A VR client may be an OMAF player or a V3C content player for file/segment reception or file access, file/
segment decapsulation, decoding of audio, video, or image bitstreams, audio and image rendering, and
viewport selection.
Figure 1
Update the figure to add missing text as follows:

© ISO/IEC 2024 – All rights reserved
ISO/IEC 23090-6:2021/Amd. 1:2024(en)
Figure 1 — Immersive media metrics client reference model

6.2.3
Add the following bullets before the last bullet:
— MIV metadata, for example:
— viewport camera information;
— viewport position information;
— viewing space information
— V-PCC metadata, for example:
— volumetric annotation information;
— scene object information;
6.2.4
Add the following bullet at the end:
— Location information (i.e., x-y-z coordinates) corresponding to the current viewport

7.1
Delete Table 1 and replace the second paragraph with the following:
Two new data types are defined: ViewportDataType and ViewpointDataType. ViewportDataType is an object
that defines a viewport and is defined as shown in Table 1, while ViewpointDataType is an object that defines
a viewpoint and is defined as shown in Table 2.

© ISO/IEC 2024 – All rights reserved
ISO/IEC 23090-6:2021/Amd. 1:2024(en)
Table 1 — ViewportDataType
Key Type Description
ViweportDataType Object
media_type Integer
Specifies the type
of the immersive
media: 0 indicates
omnidirectional
media, 1 indicates
V3C media, and
other values are
reserved.
viewport_omnidirectional OmnidirectionViweportDataType
Specifies the
viewport as an
omnidirectional
viewport. Shall
only be present if
the media_type is
equal to 0.
viewport_v3c V3CViewportDataType
Specifies the view-
port as a V3C view-
port. Shall only
be present if the
media_type is equal
to 1.
Table 2 — ViewpointDataType
Key Type Description
ViewpointDataType Object
media_type Integer
Specifies the type
of the immersive
media: 0 indicates
omnidirectional, 1
indicates V3C, and
other values are
reserved.
viewpoint_omnidirectional OmnidirectionViewpointDataType
Specifies the view-
point as an omnidi-
rectional viewpoint.
Shall only be pres-
ent if media_type
is equal to 0.
viewpoint_v3c V3CViewpointDataType
Specifies the view-
point as a V3C view-
point. Shall only be
present if media_
type is equal to 1.
For omnidirectional media, OmnidirectionalViewportDataType and OmnidirectionalViewpointDataType
are defined as shown in Table 3 and Table 4, respectively.

© ISO/IEC 2024 – All rights reserved
ISO/IEC 23090-6:2021/Amd. 1:2024(en)
Table 3 — OmnidirectionalViewportDataType
Key Type Description
OmnidirectionalViewportDataType Object

viewpoint_id Integer
Specifies the identifier of the viewpoint to which
the viewport belongs. Each viewpoint has a
unique viewpoint_id.
centre_azimuth Integer
Specifies the azimuth of the centre of the viewport
−16
in units of 2 degrees. The value shall be in the
16 16
range of −180 * 2 to 180 * 2 − 1, inclusive.
centre_elevation Integer
Specifies the elevation of the centre of the view-
−16
port in units of 2 degrees. The value shall be
16 16
in the range of −90 * 2 to 90 * 2 , inclusive.
centre_tilt Integer
Specifies the tilt angle of the viewport in units
−16
of 2 degrees. The value shall be in the range
16 16
of −180 * 2 to 180 * 2 − 1, inclusive.
azimuth_range Integer
Specifies the azimuth range of the viewport
through the centre point of the viewport, in
−16
units of 2 degrees.
elevation_range Integer
Specifies the elevation range of the viewport
through the centre point of the viewport, in
−16
units of 2 degrees.
Table 4 — OmnidirectionalViewpointDataType
Key Type Description
OmnidirectionalViwepointDataType Object

viewpoint_id Integer
Specifies an identifier for the viewpoint. Each
viewpoint has a unique viewpoint_id.
centre_azimuth Integer
Specifies the azimuth of the centre of the view-
−16
port in units of 2 degrees. The value shall
16 16
be in the range of −180 * 2 to 180 * 2 − 1,
inclusive.
centre_elevation Integer
Specifies the elevation of the centre of the
−16
viewport in units of 2 degrees. The value
16 16
shall be in the range of −90 * 2 to 90 * 2 ,
inclusive.
centre_tilt Integer
Specifies the tilt angle of the viewport in units
−16
of 2 degrees. The value shall be in the range
16 16
of −180 * 2 to 180 * 2 − 1, inclusive.
For V3C media, V3CViewportDataType and V3CViewpointDataType are defined as shown in Table 5 and
Table 6, respectively.
© ISO/IEC 2024 – All rights reserved
ISO/IEC 23090-6:2021/Amd. 1:2024(en)
Table 5 — V3CViewportDataType
Key Type Description
V3CViewportDataType Object
viewpoint V3CViewpointDataType
Specifies the viewpoint to which
the viewport belongs. Note that
each viewpoint has a unique
viewpoint_id.
camera_type Integer
Specifies the projection method
of the viewport camera. The
value 0 specifies ERP projection.
The value 1 specifies a per-
spective projection. The value
2 specifies an orthographic
projection. Values in the range
3 to 255 are reserved for future
use by ISO/IEC.
erp_horizontal_fov SignedInt
Specifies the longitude range
for an ERP projection corre-
sponding to the horizontal size
of the viewport region, in units
of radians. The value shall be in
the range 0 to 2π.
This is for camera_type = 0.
erp_vertical_fov SignedInt
Specifies the latitude range for
an ERP projection correspond-
ing to the vertical size of the
viewport region, in units of
radians. The value shall be in
the range 0 t
...