Description
Return score margin and a supplied threshold decision.
Biometric scores depend on matcher version, score direction, acquisition handling and an explicit operating threshold. Score transformations and observed error fractions are different from identity verification; equality, quantization and excluded attempts can change the local reported result.
Return score margin and a supplied threshold decision.
When to use this tool
Use Match Score Margin To Threshold when checking the stated biometric score, threshold, reporting precision or error-denominator convention.
How to use the tool and how it works
- Enter score, suppliedThreshold, higherIsMatch, equalityMatches. Use the units and conventions below.
- Run the tool. Correct any format, range, or cross-field input error before interpreting the output.
- Read margin, matchesUnderRule. Inspect matchesUnderRule before interpreting the associated values.
Return score margin and a supplied threshold decision. Orient score-threshold by higherIsMatch; matchesUnderRule requires a positive margin or exact equality with equalityMatches.1
| Input field | Meaning and units | Accepted input |
|---|---|---|
| score | Score | Required. Finite number. |
| suppliedThreshold | Supplied Threshold | Required. Finite number. |
| higherIsMatch | Higher Is Match | Required. Boolean. |
| equalityMatches | Equality Matches | Required. Boolean. |
| Output field | Interpretation | Returned shape |
|---|---|---|
| margin | Margin | Required. Finite number. |
| matchesUnderRule | Matches Under Rule | Required. Boolean. |
{
"input": {
"score": 0.8,
"suppliedThreshold": 0.7,
"higherIsMatch": true,
"equalityMatches": true
},
"output": {
"margin": 0.10000000000000009,
"matchesUnderRule": true
}
}Limitations and assumptions
- Threshold and direction are supplied; this is not authentication, performance assessment or a real permission grant.
- Inputs must satisfy both the field types and the cross-field conditions above. Invalid input causes an error; a successful false flag or documented placeholder is a different result.
- Numeric calculations use binary floating point unless exact decimal-integer arithmetic is explicitly stated. No hidden measurement tolerance or decimal rounding is added; nonfinite or out-of-contract results are rejected. Numeric signed-zero results are exported as zero.
Alternative or Complementary methods
Evaluate a validated matcher on relevant complete data with explicit acquisition/exclusion and threshold policies; assess uncertainty, privacy and fairness independently.
References
Similar or alternative tools
- Matcher Score Direction Sign
Orient a matcher score margin by supplied score direction.
- Verification Threshold Equality Flag
Return a biometric score decision with explicit equality and direction.