1     Definition 2     Functional Requirements 3     Syntax
4     Semantics 5    Conformance Testing 6     Performance Assessment

1      Definition

An Item representing an Object’s  orientation, velocity, and acceleration.

2      Functional Requirements

  • The Orientation of an Object is that of the principal axis of an Object.
  • The following media types are supported: Audio; Visual; Audio-Visual; Haptic; Smell; RADAR; LiDAR; Ultrasound.
  • Error is the estimated error in the measured value of each of  Orientation,  OrientVelocity, and OrientAccel.
  • Error is assumed to be the same for the three components of each value set.

3      Syntax

https://schemas.mpai.community/OSD/V121/data/Orientation.json

4      Semantics

Table 1 provides the semantics of the components of Orientation. It should be noted that the Euler angles are indicated by (α,β,γ).

Table 1 – Semantics of Orientation

Header N1 Bytes Orientation Header
– Standard-Orientation 9 Bytes The characters “OSD-OOR-V”
– Version N2 Bytes Major version – 1 or 2 characters
– Dot-separator 1 Byte The character “.”
– Subversion N3 Bytes Minor version – 1 or 2 characters
MInstance N4 Bytes ID id Virtual space Orientation refers tu
ObjectOrientationID N5 Bytes  Identifier of Object Orientation.
General N6 Bytes Set of general data
– CoordType N7 Bytes One of Cartesian, Spherical, Geodesic, Toroidal.
– ObjectType N8 Bytes One of Digital Human, Generic.
– MediaType N9 Bytes One of Speech, Audio, Visual, Audio-Visual, Haptic, Smell, RADAR, LiDAR, Ultrasound.
– Precision N10 Bytes One of single precision, double precision
Orientation
– Orient (α,β,γ) 12/24 Bytes Array (in degrees)
Velocity of Orientation
– OrientVelocity (α,β,γ) 12/24 Bytes Array (in degrees/s)
Acceleration of Orientation
– OrientAccel (α,β,γ) 12/24 Bytes Array (in degrees/s2)
Errors
– ErrOrientation N11 Bytes Error of Orientation
– ErrOrientVelocity N12 Bytes Error of OrientVelocity
– ErrOrientAccel N13 Bytes Error of OrientAccel
DescrMetadata N14 Bytes Descriptive Metadata

5     Conformance Testing

A Data instance Conforms with Orientation (OSD-OOR) V1.2 if:

  1. The Data validates against the Orientation’s JSON Schema.
  2. All Data in the Orientation’s JSON Schema have the specified types.

6     Performance Assessment