annotate_artifact.h File Reference

Continuous-data annotation of muscle and amplitude artefacts. More...

#include "dsp_global.h"
#include <fiff/fiff_annotations.h>
#include <Eigen/Core>
#include <QString>
#include <limits>

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Classes
struct	UTILSLIB::AnnotateMusclParams
	Parameters for muscle artifact annotation. More...
struct	UTILSLIB::AnnotateAmplitudeParams
	Parameters for amplitude-based annotation. More...

Namespaces
namespace	FIFFLIB
	FIFF file I/O, in-memory data structures and high-level readers/writers.
namespace	UTILSLIB
	Shared utilities (I/O helpers, spectral analysis, layout management, warp algorithms).

Functions
DSPSHARED_EXPORT FIFFLIB::FiffAnnotations	UTILSLIB::annotateMusclZscore (const Eigen::MatrixXd &data, const FIFFLIB::FiffInfo &info, double sfreq, const AnnotateMusclParams &params=AnnotateMusclParams(), Eigen::RowVectorXd *scores=nullptr)
	Detect muscle artifacts via high-frequency z-score and annotate bad segments.
DSPSHARED_EXPORT FIFFLIB::FiffAnnotations	UTILSLIB::annotateAmplitude (const Eigen::MatrixXd &data, const FIFFLIB::FiffInfo &info, double sfreq, const AnnotateAmplitudeParams &params=AnnotateAmplitudeParams())
	Annotate segments where amplitude exceeds thresholds or is too flat.

Detailed Description

Continuous-data annotation of muscle and amplitude artefacts.

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

Author

Christoph Dinh chris.nosp@m.toph.nosp@m..dinh.nosp@m.@mne.nosp@m.-cpp..nosp@m.org

Since

2.2.1

Date

May 2026

The detectors in this header scan continuous MEG / EEG data and emit FIFFLIB::FiffAnnotation intervals marking time segments that should be excluded from downstream averaging, ICA fitting or PSD estimation. annotateMusclZscore band-pass filters the signal in the 110–140 Hz range (typical EMG band), z-scores the Hilbert envelope of every channel, combines and smooths the scores and marks samples above a threshold as BAD_muscle. annotateAmplitude flags two boundary conditions instead: per-channel peak-to-peak amplitude exceeding an upper limit ("high-amplitude" artefact) and amplitude falling below a lower limit for longer than a minimum duration ("flat" / dead channel).

Both routines mirror the semantics of their MNE-Python counterparts mne.preprocessing.annotate_muscle_zscore and mne.preprocessing.annotate_amplitude; annotateMusclZscore reproduces mne's onsets and durations sample for sample.

Definition in file annotate_artifact.h.