Go to MPAI-OSD Data Types

Definition Functional Requirements Syntax Semantics Conformance Testing Performance Assessment

1      Definition

A Data Type including the Visual Objects of a scene, their time and arrangement in the scene, and the Rights that may be exercised on the scene.

In the following, “Object” and “Scene” are to be read as “Visual Object” and “Visual Scene”, respectively.

2      Functional Requirements

Basic Visual Scene Descriptors include

  1. Scene Space-Time information.
  2. Objects.
  3. Object Space-Time information

The Space-Time of the Visual Objects may be superseded by the Space-Time of the Visual Scene.

5     Syntax

https://schemas.mpai.community/OSD/V1.5/data/BasicVisualSceneDescriptors.json

4      Semantics

Label Description
Header Basic Visual Scene Descriptors Header – Standard “OSD-BVS-V”.
MInstanceID Identifier of M-Instance.
BasicVisualSceneDescriptorsID Identifier of Basic Visual Scene Descriptors.
SceneCreationTime Timestamp of scene capture or synthesis
GravityValue The value of Gravity in the Basic Scene measure in m/s2.
BasicVisualSceneDescriptorsSpaceTime Space and Time of Basic Visual Scene Descriptors.
ViewerPointOfView PoV and Aperture of User/Device viewing/capturing scene.
GravityValue Local Gravity.
VisualObjectCount Number of Visual Objects in Basic Visual Scene.
BasicVisualSceneObjects[] Set of Visual Objects.
– BasicVisualSceneObject A Visual Object.
– BasicVisualSceneObjectSpaceTime Space Time of Visual Object.
DataXMData Information about this Basic Visual Scene Descriptors Instance.
DescrMetadata Descriptive Metadata

5     Conformance Testing

A Data instance Conforms with Basic Visual Scene Descriptors (OSD-BVS) if:

  1. The Data validates against the Basic Visual Scene Descriptors’ JSON Schema.
  2. All Data in the Basic Visual Scene Descriptors’ JSON Schema
    1. Have the specified type
    2. Validate against their JSON Schemas
    3. Conform with their Visual Data Qualifiers.

6     Performance Assessment