Thing > Annotation > Region > Polygon

Definition	A polygon in an image or video. This is a two-dimensional object so if this occurs in a video it will be anchored to a particular frame or time point in the video.
URI	http://mmif.clams.ai/vocabulary/Polygon/v3

Metadata

Metadata from Region

Property	Type	Description
timeUnit	String	Specifies which unit of time the measurement is based. Can be *seconds* or *milliseconds*, or in case of annotations on a VideoDocument, *frames*.

Metadata from Annotation

Property	Type	Description
document	ID	The identifier of the document that the annotation is over. This has to be defined either at the metadata level, in which case it has scope over all annotations of the same type in a view, or at the instance level, in which it has scope over just the single annotation.
labelset	List of Strings	When an annotation object contains results of a classification task, this metadata is used to specify the label values used in classification. Individual annotations then must have label property that is one of the values in this list. [Note] Annotations from a classifier app must have this metadata or labelsetUri metadata. [Note] Not all of labels specified in the labelset must occur in the output annotations. For example, a labelset can contain a catch-all negative label, but if the negative label can be not interesting enough to keep in the output annotation.
labelsetUri	String	A URI to an externally defined labelset. Since the labelset metadata is a list of simple strings, this URI can be used to point to a more detailed definition of the labelset. This can be a JSON-LD document or a SKOS concept scheme, for example. [Note] Annotations from a classifier app must have this metadata or labelset metadata.

Properties

Property	Type	Description
coordinates	List of pairs	The coordinates of the polygon, taking the top-left of the image as the origin (0,0). Unit used to measure the distance is the number of pixels. [Required]
timePoint	Integer	If on a video stream, the TimePoint that the BoundingBox occurs in.

Properties from Annotation

Property	Type	Description
document	ID	The identifier of the document that the annotation is over.
label	String	A label given to this object by a classifier. The value must be a simple string value of the label and must be one of the values defined in the labelset or labelsetUri annotation metadata. [Note] Annotations from a classifier app must have this property.
classification	Map from String to Number	A map from label values to their "score" numbers provided by a classifier. The score can be probability, similarity, confidence, or any other real number that was used to determine the label value. [Optional] on top of the label property. However when this property is used, the label property must be one of the keys and the keys must match to the values defined in the labelset or labelsetUri annotation metadata.

Properties from Thing

Property	Type	Description
id	ID	A unique identifier for the annotation or document. Uniqueness is relative to the view the annotation is in or the list of documents at the top level of a MMIF file. [Required]