Description
Return a score-precision envelope and threshold overlap.
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 a score-precision envelope and threshold overlap.
When to use this tool
Use Biometric Threshold Quantization Tie Interval when checking the stated biometric score, threshold, reporting precision or error-denominator convention.
How to use the tool and how it works
- Enter score, resolution, threshold, rounded. Use the units and conventions below.
- Run the tool. Correct any format, range, or cross-field input error before interpreting the output.
- Read lower, upper, thresholdInside. Inspect thresholdInside before interpreting the associated values.
Return a score-precision envelope and threshold overlap. Require resolution > 0; rounded uses score +/- half-resolution, otherwise score to score+resolution; thresholdInside includes both envelope endpoints.1
| Input field | Meaning and units | Accepted input |
|---|---|---|
| score | Score | Required. Finite number. |
| resolution | Resolution | Required. Finite number; strictly above 0. |
| threshold | Threshold | Required. Finite number. |
| rounded | Rounded | Required. Boolean. |
| Output field | Interpretation | Returned shape |
|---|---|---|
| lower | Lower | Required. Finite number. |
| upper | Upper | Required. Finite number. |
| thresholdInside | Closed comparison at both reported envelope endpoints, including in nonrounded mode. | Required. Boolean. |
{
"input": {
"score": 0.5,
"resolution": 0.1,
"threshold": 0.52,
"rounded": true
},
"output": {
"lower": 0.45,
"upper": 0.55,
"thresholdInside": true
}
}Limitations and assumptions
- This helper uses closed bounds even in nonrounded mode; the envelope concerns reporting precision, not confidence or privacy.
- 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
- Biometric Score Tie Quantum
Return floor-quantized score bins and their equality.
- Biometric Score Normalization One Reference
Return standardized and min-max score values.