Pixel mask

SourceAFIS » Algorithm » Transparency » Pixel mask

Pixel mask, a part of algorithm transparency, is an expansion of filtered mask from primary blocks to individual pixels. It is constructed during feature extraction. It is used to compute inner mask and to create binarized skeleton for valleys.

Key	MIME	Filename in ZIP
`pixel-mask`	`application/cbor`	`019-pixel-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.

Fingerprint image with valid fingerprint area highlighted in yellow color — Valid fingerprint area is shown as light yellow.

Format

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

Example: 019-pixel-mask.cbor

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