Top minutiae

SourceAFIS » Algorithm » Transparency » Top minutiae

Top minutiae, a part of algorithm transparency, are the result of a filter applied to skeleton minutiae after removing minutia clouds and before shuffling. Top minutia filter is only applied when there are too many minutiae. It removes the lowest quality minutiae, usually the ones packed most closely together.

Key	MIME	Filename in ZIP
`top-minutiae`	`application/cbor`	`041-top-minutiae.cbor`

Visualization

Visualization of top minutiae was constructed by comparing this stage's CBOR data with cloud removal data. Original fingerprint is in the background. Visualization itself is not part of transparency data.

Fingerprint minutiae, blue endings and green bifurcations, after removal of minutia clouds with original fingerprint in the background — Most valuable minutiae. Endings are blue, bifurcations are green. Removed minutiae, if any, are marked red.

Format

Format of top minutiae is identical to skeleton minutiae.

Example: 041-top-minutiae.cbor

{
  "size": {
    "x": 388,
    "y": 374
  },
  "minutiae": [
    {
      "position": {
        "x": 201,
        "y": 23
      },
      "direction": 3.041924,
      "type": "ENDING"
    },
    {
      "position": {
        "x": 283,
        "y": 72
      },
      "direction": 1.0303768,
      "type": "ENDING"
    },
    "... skipped 42 items ...",
    {
      "position": {
        "x": 245,
        "y": 286
      },
      "direction": 5.497787,
      "type": "BIFURCATION"
    },
    {
      "position": {
        "x": 224,
        "y": 324
      },
      "direction": 6.0857897,
      "type": "BIFURCATION"
    }
  ]
}