Segmentation of electrical signal by wave specifications
segmentation(
object,
by = "sinus",
pad = "before",
pad_length = 0L,
center = NULL
)segment_by_sinus(object)
pad_sequence(object, pad, pad_length)
center_sequence(object, center, pad_length)
Returns a list of egm objects. Each item is a segmentation of an
egm, using the selected channels (if available). It will attempt to
optimize and pick the best annotations to help create consistencies between
the signal channels as possible.
Object of the egm class, which includes header, signal
information, and annotation information.
A character string naming waveform type to segment by. Options
include the following:
sinus = Will call segment_by_sinus() on egm object
character String to specify which side of sequence to pad (or
both). Options include c("before", "after", "both").
Default is before. If center is being used, then the this argument is ignored.
Offers padding of the segmented beats to a maximum length,
as an integer. The default is 0L, which means no padding will be
applied. If pad > 0 then will add the baseline value (specified within
the header of the signal) to either before or after the signal. You can
also choose to center the sequence, which will also only occur if pad > 0. I.e., if pad = 500 then each segmented object will be increased TO a
max length of 500. If the maximum size is larger than the padding size,
then a warning will be issued and the sequence will be truncated.
A single Roman alphabetic letter character that utilizes the
annotations given in the egm object to center the sequence. This is found
under the type variable in the annotation table.
For example, if sinus waveforms were annotated as c("P", "R", "T") at
their peak, then could center around R. This will only occur if pad > 0L. This is case-insensitive. The amount of padding will be determined by
the pad_length argument
Identify individual sinus beats on surface ECG and extract as individual
beats, returning a list of sinus beats in the form of the egm class. a
consistent P, R, and T wave amongst all channels. If a channel
does not have, for example, a visible T wave, it will still label it as
information gained from other channels. This is based off of the algorithm
from the annotation tool named ecgpuwave. Please see read_annotation()
for further details.
Requires a 12-lead ECG that has been digitized, and input as an
egm object. This object must have an annotation file associated with it
that contains demarcation annotations. Please see below for approaches based
on the annotation type. Current, the following are supported:
sinus = supports using ecgpuwave as the annotator