Table 1.

A summary of the related terminologies.

Term	Alternative Term	Description
Enrollment	-	Registering a new ECG into the system
Classification	-	Referring to both verification and identification
Query	-	ECG used for classification
Classification scope	Closed set [18] Gallery [17] Gallery set [15,16]	Collection of enrolled ECGs to be considered during a classification
Individual verification	-	Classifying whether the query matches 1 claimed identity
Scope verification	Identity verification [18] Set verification [15,16]	Classifying whether the query matches identities in the classification scope
Closed identification	-	Identification with the assumption that the query must match 1 identity within the classification scope
Opened identification	-	Closed identification + scope verification