MAVA Ontology

A collection of videos that share a common context or purpose.

A media resource consisting of a sequence of images creating the illusion of movement.

• has member ^op
• has video ^op

A .mediapkg archive: a ZIP containing a manifest.json and Parquet annotation files for one or more videos. The unit of interchange between tools.

A series of interval-based annotations for a video. Each row covers a time span with a start and end time. Maps to an interval Parquet file in .mediapkg.

A series of interval-based annotations with multiple labels per interval for a video. Each row covers a time span with a start and end time. Maps to an Parquet file in .mediapkg with a list column.

A single annotation: a time interval with associated value(s). Maps to one row in an annotation Parquet file.

• belongs to annotation series ^op
• start time ^dp
• end time ^dp

• Annotation Segment ^c
• Annotation List Segment ^c

A single-valued annotation: one time interval with one string value.

A multi-valued annotation: one time interval with multiple string values.

A dense time-series of numeric observations sampled at regular intervals. The dimensions (what is measured) are declared via mava:hasDimension. Maps to a time-series Parquet file in .mediapkg.

• has dimension ^op
• sampling interval ^dp

A set of numeric values recorded at a single point in time. One row in a time-series Parquet file, with one value per dimension.

• belongs to observation series ^op
• at time ^dp
• numeric value ^dp

A single measured quantity within an ObservationSeries, corresponding to one column in the Parquet file. Examples: 'angry', 'explosion_score', 'interior_exterior'.

• dimension name ^dp
• dimension description ^dp
• value range ^dp

Relates a VideoCorpus or Video to the MediaPackage containing its annotations.

Relates an ObservationSeries to the dimensions it measures.

Relates a VideoCorpus to the videos it contains.

Relates a MediaPackage to the videos it contains annotations for.

Relates a Video to one of its annotation or observation series.

Relates an Annotation back to its parent AnnotationSeries.

Relates an ObservationPoint back to its parent ObservationSeries.

The name of a dimension, matching the column name in the Parquet file.

Human-readable description of what this dimension measures.

Description of the value range, e.g. '[0,1]', 'boolean', 'categorical'.

Human-readable description of what a series contains.

For ObservationSeries: the interval between samples in seconds, e.g. 0.5.

Time of an ObservationPoint in seconds from the start of the video. Maps to 'start_seconds' column in time-series Parquet files.

Start time of an AnnotationSegment in seconds from the start of the video.

End time of an AnnotationSegment in seconds from the start of the video. Primary field — duration is derivable as (endTime - startTime).

A numeric value at an ObservationPoint. In Parquet, each dimension has its own column — the column name identifies the dimension.

A string annotation value. Used for transcript text, shot labels, face emotion labels. Maps to 'annotations' column in interval Parquet files.

A list of string values for an AnnotationListSegment. Maps to the 'annotations' column (Parquet LIST type) in list annotation files.