Confidence Score Bands

Confidence score thresholds

Confidence bands and Decision policy are terms used to classify the degree to which an existing biometric template matches a currently captured one. Thus, this terms are used for Identification and Verification workflows.

The Decision Policy thresholds are configured in the project configuration in Simprints ID servers, and can be adjusted to affect the outcome of the resulting matched beneficiaries. Thus Simprints ID uses the specified thresholds to determine if a potential matching biometric record is worthy of being added to the candidate list.

The ConfidenceBand is an enum with 4 values indicating the rankings and can be accessed using the getConfidenceBand method of the Identification or Verification objects.

enum class ConfidenceBand {
    HIGH,   // Almost certainly a match (the biometrics are very similar)
    MEDIUM, // Possible match
    LOW,    // Not a match (the biometrics are very different)
    NONE,   // Confidence is below "Low" (likely a capture error)
}

Confidence Scores

The confidence score is a numerical value that indicates the likelihood of a match. The returned number is dependent on the biometric modality selected. The confidence score adapts over time, as the match results become more accurate.

// accessing the value
val score = verification.confidence