Orthogonal smoothing

SourceAFIS » Algorithm » Transparency » Orthogonal smoothing

Orthogonal smoothing data, a part of algorithm transparency, is computed from equalized image during feature extraction by smoothing pixels orthogonally to smoothed ridge orientation in all primary blocks that are within mask. Orthogonal smoothing data is used together with parallel smoothing to produce binarized image.

Key	MIME	Filename in ZIP
`orthogonal-smoothing`	`application/cbor`	`017-orthogonal-smoothing.cbor`

Visualization

The following image can be reconstructed from this stage's binary data. Visualization itself is not part of transparency data.

Fingerprint image with smoothing across ridges — Fingerprint image after orthogonal smoothing. Only areas within mask are computed.

Format

Format of the orthogonal smoothing data is identical to that of parallel smoothing.

Example: 017-orthogonal-smoothing.cbor

{
  "width": 388,
  "height": 374,
  "cells": [
    0.0,
    0.0,
    "... skipped 145,108 items in range -0.997 to 0.470 ...",
    0.0,
    0.0
  ]
}