Moving window with two conditions - Matlab

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Ganesh Naik
Ganesh Naik on 6 Nov 2019
Commented: Ganesh Naik on 30 Jul 2020
I have a time series data with the amplitude of the values range from 1 to 100. I need to use a moving window (10 seconds duration) and flag/highlight the segments of the data that falls with the threshold range of 91 to 97 for at least 10 seconds or more.
Any help in this regard is highly appreciated.
Thanks in advance

Answers (1)

Ayush Gupta
Ayush Gupta on 5 Jun 2020
Try following this approach, it returns the regions in the moving window in between the defined thresholds:
% Define sample data and the threshold values.
A = count1.Data.';
threshold1 = 12;
threshold2 = 21;
moving_window = 10;
% Find logical vector where A>=hreshold1 and A<=threshold2
binaryVector = (A >= threshold1) & (A<=threshold2);
% Label each region with a label - an "ID" number.
[labeledVector, numRegions] = bwlabel(binaryVector);
% Measure lengths of each region and the indexes
measurements = regionprops(labeledVector, A, 'Area', 'PixelValues');
% Find regions where the area (length) is greater or equal to moving
% window and put the values into a cell of a cell array
ca = {};
for k = 1 : numRegions
if measurements(k).Area >= moving_window
ca{end+1} = measurements(k).PixelValues;
% Area (length) is greater or equal to moving window, so store the values.
end
end
% Display the regions that meet the criteria:
celldisp(ca)
  1 Comment
Ganesh Naik
Ganesh Naik on 30 Jul 2020
Hi Ayush thanks for the answer. Could you please help me to plot these regions and shade them.

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