# Image Comparison

This section describes the actions that you can use to train image comparison.

NOTE: Apart from ListImageComparisonDatabases, ListImageComparisonReferences, and GetImageComparisonReferenceImage, all of these actions are administrative actions. Administrative actions can be sent only by users who belong to an authorization role that allows the `Admin` standard role, or which enables the action explicitly. See Authorization Roles Configuration Parameters.

AddImageComparisonMetadata | Adds custom metadata (a key-value pair) to a reference for image comparison.
CreateImageComparisonDatabase | Creates a new, empty, database to store information for image comparison.
ExportImageComparisonDatabase | Exports an image comparison database.
GetImageComparisonReferenceImage | Returns a training image associated with an image comparison reference.
ImportImageComparisonDatabase | Imports an image comparison database.
ListImageComparisonDatabases | Lists the databases that have been created to store information for use with image comparison.
ListImageComparisonReferences | Returns a list of image comparison references in a specified database.
MoveImageComparisonReference | Moves an image comparison reference from one database to another.
RelabelImageComparisonReferenceImage | Relabels a training image for an image comparison reference.
RemoveImageComparisonDatabase | Removes (deletes) a database that stores information for image comparison.
RemoveImageComparisonMetadata | Removes custom metadata (a key-value pair) from a reference for image comparison.
RemoveImageComparisonReference | Removes (deletes) an existing reference for image comparison.
RenameImageComparisonDatabase | Renames a database that stores information for image comparison.
RenameImageComparisonReference | Changes the identifier for an image comparison reference that you have already added to a database.
SyncImageComparisonReferences | Forces Media Server to synchronize with the latest image comparison training data in the database.
TrainImageComparisonReference | Trains Media Server to identify changes to an image (adds a new reference with a training image).
UnsyncImageComparisonReferences | Removes all image comparison training from memory (does not affect the database).
UpdateImageComparisonMetadata | Updates the value of a key-value pair in the custom metadata of a reference for image comparison.

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