Inner mask in SourceAFIS transparency data

SourceAFIS » Algorithm » Transparency » Inner mask

Inner mask, a part of algorithm transparency, is computed during feature extraction by shrinking pixel mask. It represents inner fingerprint area, somewhat away from fingerprint border. It is used for inner minutiae filtering.

KeyMIMEFilename in ZIP
inner-maskapplication/cbor021-inner-mask.cbor

Visualization

The following visualization was created from this stage's binary data overlaid on top of the original fingerprint image. Visualization itself is not part of transparency data.

Inner mask region is shown as light yellow.

Format

Inner mask format is the same as for filtered mask except that matrix cells represent individual pixels rather than blocks.

Example: 021-inner-mask.cbor

{
  "width": 388,
  "height": 374,
  "cells": [
    false,
    false,
    "... skipped 145,108 items ...",
    false,
    false
  ]
}