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Capitalised Terms have the meaning defined in Table 1. All MPAI-defined Terms are accessible online. Terms with a lower case initial have the meaning commonly defined for the context in which they are used or represent an entity in the real world. For instance,

  1. Table 1 defines Object, Scene, and User but does not define object, scene, and human.
  2. Object indicates an Item but object indicates an entity in the Universe commonly classified as object.

A dash “-” preceding a Term in Table 1 means the following:

  1. If the font is normal, the Term in Table 1 without a dash and preceding the one with a dash should be placed before that Term. The notation is used to concentrate in one place all the Terms that are composed of, e.g., the word Data followed by one of the words Format and Type.
  2. If the font is italic, the Term in the table without a dash and preceding the one with a dash should be placed after that Term. The notation is used to concentrate in one place all the Terms that are composed of, e.g., the word Descriptor preceded by one of the words Face and Body.

Table 1 – Terms and Definitions

Term Definition
3D Model Data representing the surface and relevant features of objects from the real world, or Media Data or a mixture of the two.
Avatar A 3D Model representing a real or fictitious person or Data representing a real person.
– Portable A Data Type conveying information related to an Avatar such as Avatar ID, Avatar Model, Body Descriptors, Face Descriptors, Speech Data, and Text, and Context information such as Time, Audio-Visual Scene, Spatial Attitude, Language Preference, and Personal Status.
Body A digital representation of a human body, head included, face excluded.
– Descriptors A Data Type representing the motion of the body of an Entity.
Face The digital representation of a human face.
– Descriptors A Data Type representing the motion and conveying information on the Personal Status of the face of an Entity.
– Identifier The Identifier of a human inferred from analysing the face of that human.
Gesture A Data Type representing the movement of the body or part of it, such as the head, arm, hand, and finger, often as a complement to a vocal utterance.
Human A human being in a real space.
– Digital A Digitised or a Virtual Human.
– Digitised Data that has the appearance of a specific human when rendered.
– Virtual Data created by a computer that has a human appearance when rendered but is not a Digitised Human.
Visual A Data Type whose instance represents analogue signals – or is rendered to be perceived – in the human-visible range (380 to 700 nanometres).

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