Score components in SourceAFIS transparency data

SourceAFIS » Algorithm » Transparency » Score components

Detailed scoring, a part of algorithm transparency, is a breakdown of similarity score that is computed by SourceAFIS during matching for a pair of fingerprints. Scoring is done separately for every pairing. Pairing with the highest total score is selected as the best match.

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Scoring is recorded as a CBOR-encoded object holding several fields. Final similarity score is stored in shapedScore field. Other fields describe intermediate scores that contribute to the final score.

Example: 047-score.cbor

  "minutiaCount": 29,
  "minutiaScore": 0.928,
  "minutiaFractionInProbe": 0.6170212765957447,
  "minutiaFractionInCandidate": 0.7435897435897436,
  "minutiaFraction": 0.6803055100927442,
  "minutiaFractionScore": 6.109143480632843,
  "supportingEdgeSum": 270,
  "edgeCount": 299,
  "edgeScore": 79.235,
  "supportedMinutiaCount": 29,
  "supportedMinutiaScore": 5.597,
  "minutiaTypeHits": 26,
  "minutiaTypeScore": 16.354,
  "distanceErrorSum": 253,
  "distanceAccuracySum": 111,
  "distanceAccuracyScore": 3.0189560439560443,
  "angleErrorSum": 4.476240332317074,
  "angleAccuracySum": 5.297603478851171,
  "angleAccuracyScore": 1.5122314200586873,
  "totalScore": 112.75433094464756,
  "shapedScore": 225.6584429542732