Minutia clouds

SourceAFIS » Algorithm » Transparency » Minutia clouds

Removed minutia clouds, a part of algorithm transparency, is a filter applied to skeleton minutiae after inner minutiae filter and before top minutiae filter. Minutia clouds are tightly packed constellations of minutiae. Minutia clouds are usually a result of errors in prior stages of the algorithm.

Key	MIME	Filename in ZIP
`removed-minutia-clouds`	`application/cbor`	`040-removed-minutia-clouds.cbor`

Visualization

Visualization of minutiae after minutia cloud removal was constructed by comparing this stage's CBOR data with inner minutiae. 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 — Minutiae after removal of minutia clouds. Endings are blue, bifurcations are green. Removed minutiae, if any, are marked red.

Format

Format of the intermediate template after removal of minutia clouds is identical to skeleton minutiae.

Example: 040-removed-minutia-clouds.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"
    }
  ]
}