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Edge operator shows both rising and falling edge

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Max Sekundo
Max Sekundo 2021-1-26
回答： Image Analyst 2021-2-1
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

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回答（2 个）

Shubham Rawat
Shubham Rawat 2021-2-1
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!
Image Analyst
Image Analyst 2021-2-1
Try this trick of using strfind():
risingEdgeIndexes = strfind(L, [0, 1]) + 1;

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