Combined mask

SourceAFIS » Algorithm » Transparency » Combined mask

Combined mask, a part of algorithm transparency, merges absolute contrast mask and relative contrast mask. It is computed during feature extraction. It is further refined into filtered mask before being used extensively to focus later algorithm stages on valid fingerprint area.

Key	MIME	Filename in ZIP
`combined-mask`	`application/cbor`	`010-combined-mask.cbor`

Visualization

This visualization can be computed from this stage's binary data mapped onto blocks and the original fingerprint image. Visualization itself is not part of transparency data.

Combined absolute and relative contrast mask visualized as yellow masked out area around fingerprint image — Combined (absolute and relative) contrast mask. Yellow area consists of blocks excluded due to low contrast.

Format

Combined mask has the same format as absolute contrast mask.

Example: 010-combined-mask.cbor

{
  "width": 26,
  "height": 25,
  "cells": [
    true,
    true,
    "... skipped 646 items ...",
    true,
    true
  ]
}