1     Definition 2     Functional Requirements 3     Syntax
4     Semantics 5    Conformance Testing 6     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. Visual Objects
  2. Space-Time information.
  3. Rights that may be exercised on the Basic 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.
PointOfView PoV and Aperture of User/Device viewing/capturing scene.
VisualObjectCount Number of Visual Objects in Basic Visual Scene.
BasicVisualSceneObjects[] Set of Visual Objects.
– BasicVisualSceneObject A Visual Object.
– BasicVisualSceneObjectSpaceTime Space Time of Visual Object.
– Scene Enrichment Additional scene descriptors from app-related analysis.
  – Depth Estimated distance from the PointOfView origin.
  – OcclusionFlag Object visibility status from the PointOfView.
  – Affordance Interaction affordances.
  – InteractionPotential Degree/nature of interaction.
  – SalienceScore Score (0–1) of visual prominence.
  – EnrichmentTrace AIM and Timestamp of enrichment.
Rights Rights that may be exercised on the Basic Visual Scene.
Trace Provenance information and time of production
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