Identifying periods of signal above threshold
5 vues (au cours des 30 derniers jours)
Afficher commentaires plus anciens
Antonio Morales
le 16 Août 2016
Modifié(e) : Antonio Morales
le 16 Août 2016
The code below provides number of "bursts" or periods of activity (300 consecutive points = 0.2 s) above a given threshold. How could I add a further condition to the code that identifies "bursts" only when there are at least n values of separation (i.e. 1200 points) (below the threshold) between two different bursts?
above_threshold = (signal > threshold);
minAcceptableLength = 300;
% Find spans that are long enough.
isLongEnough = bwareafilt(above_threshold, [minAcceptableLength, inf]);
% Count the number of spans (bursts) that are long enough.
[labeledSpans, numberOfBursts] = bwlabel(isLongEnough);
0 commentaires
Réponse acceptée
Image Analyst
le 16 Août 2016
You'd have to look at the inverse: ~isLongEnough. Then call regionprops() to measure the lengths of all the stretches/gaps between the bursts. Then take some action depending on whether they are long enough or not.
labeledLowSignalRegions = bwlabel(~isLongEnough);
props = regionprops(labeledLowSignalRegions, 'Area');
allLengths = [props.Area]
1 commentaire
Antonio Morales
le 16 Août 2016
Modifié(e) : Antonio Morales
le 16 Août 2016
Plus de réponses (0)
Voir également
Catégories
En savoir plus sur Spectral Measurements dans Help Center et File Exchange
Produits
Community Treasure Hunt
Find the treasures in MATLAB Central and discover how the community can help you!
Start Hunting!