Edge operator shows both rising and falling edge

Im trying to detect the rising edge of a datastream. My code looks as follows:

data = importdata('myfile');
Trigger = data.data(:,1)
L = logical(Trigger)

which results in the following figure.

As I only want the rising edge the edge() operator from the image processing package should give me just that.

but for some reason it ends up like this:

M = edge(L);

what am i doing wrong?

thanks

Answer 1

[Shubham Rawat]

Hi Max,

Edge functionality is used to detect edges(boundaries) in an image. You may look into the documentation here:

Find edges in intensity image - MATLAB edge (mathworks.com)

To detect rising or falling edge in data:

You may use this: Rising or falling edges of EdgeCount signals - MATLAB (mathworks.com)

Hope this Helps!

Answer 2

[Image Analyst]

Try this trick of using strfind():

risingEdgeIndexes = strfind(L, [0, 1]) + 1;