fiff_dig_point.h File Reference

Single digitization point (FIFF_DIG_POINT) with kind (cardinal/HPI/EEG/extra), identifier and 3D coordinates. More...

#include "fiff_global.h"
#include "fiff_types.h"
#include <QSharedPointer>
#include <QDebug>
#include <memory>

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Classes
class	FIFFLIB::FiffDigPoint
	One digitizer point: kind (cardinal/HPI/EEG/extra), ident, 3D position in FIFFV_COORD_HEAD. More...

Namespaces
namespace	FIFFLIB
	FIFF file I/O, in-memory data structures and high-level readers/writers.

Detailed Description

Single digitization point (FIFF_DIG_POINT) with kind (cardinal/HPI/EEG/extra), identifier and 3D coordinates.

SPDX-License-Identifier: BSD-3-Clause Copyright (c) 2012-2026 MNE-CPP Authors

Author

Christoph Dinh chris.nosp@m.toph.nosp@m..dinh.nosp@m.@mne.nosp@m.-cpp..nosp@m.org; Christof Pieloth pielo.nosp@m.th@l.nosp@m.abp.h.nosp@m.twk-.nosp@m.leipz.nosp@m.ig.d.nosp@m.e; Jana Kiesel jana..nosp@m.kies.nosp@m.el@tu.nosp@m.-ilm.nosp@m.enau..nosp@m.de; Lorenz Esch loren.nosp@m.z.es.nosp@m.ch@tu.nosp@m.-ilm.nosp@m.enau..nosp@m.de; doerf.nosp@m.elru.nosp@m.ben@a.nosp@m.ol.c.nosp@m.om rdorf.nosp@m.el@m.nosp@m.gh.ha.nosp@m.rvar.nosp@m.d.edu; Ruben Doerfel doerf.nosp@m.elru.nosp@m.ben@a.nosp@m.ol.c.nosp@m.om; Juan GPC jgarc.nosp@m.iapr.nosp@m.ieto@.nosp@m.mgh..nosp@m.harva.nosp@m.rd.e.nosp@m.du; Gabriel Motta gabri.nosp@m.elbe.nosp@m.nmott.nosp@m.a@gm.nosp@m.ail.c.nosp@m.om

Since

0.1.0

Date

October 2012

The Polhemus / optical digitizer used for MEG/EEG coregistration writes one FIFF_DIG_POINT tag per landmark into the FIFFB_ISOTRAK block. Each tag carries a kind (FIFFV_POINT_CARDINAL for nasion / LPA / RPA, FIFFV_POINT_HPI for head-position-indicator coils, FIFFV_POINT_EEG for electrode positions, FIFFV_POINT_EXTRA for additional head-shape samples), a per-kind index, and the (x, y, z) position in metres in the FIFFV_COORD_HEAD frame.

FiffDigPoint wraps that record. The point cloud assembled from all dig points drives head-shape based coregistration and the iterative closest-point fit in mne_analyze, mirroring the info['dig'] list consumed by mne.io.Info in MNE-Python.

Definition in file fiff_dig_point.h.