Inner minutiae

SourceAFIS » Algorithm » Transparency » Inner minutiae

Inner minutiae, a part of algorithm transparency, are the result of the first filter applied to skeleton minutiae before removing minutia clouds. Inner minutiae are those minutiae that are within inner mask when offset against their direction (in effect, inward pointing minutiae are filtered more aggressively).

Key	MIME	Filename in ZIP
`inner-minutiae`	`application/cbor`	`039-inner-minutiae.cbor`

Visualization

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

Fingerprint minutiae, blue endings and green bifurcations, after inner mask filtering with original fingerprint in the background — Minutiae filtered by inner mask. Endings are blue, bifurcations are green. Removed minutiae, if any, are red.

Format

Format of inner minutiae is identical to skeleton minutiae.

Example: 039-inner-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"
    }
  ]
}