Edge Detection without function

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Fifit Yulianti
Fifit Yulianti 2018-11-12
评论： Holden Tranquillo 2023-9-20
How to make edge detection manually / without Matlab function?
  1 个评论
Walter Roberson
Walter Roberson 2018-11-12
What operations are you permitted? For example in MATLAB, the == operator is a function.

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回答（1 个）

Luna
Luna 2018-11-12
Hello Fifit,
Signal should be a vertical vector. Value is a constant double. Index is the result which is a logical array where rising or falling edge occured.
Try this code:
signal = [10 10 5 5 2 2 2 5 5 8 8 5 5]'
value = 5;
This is for rising edge:
locations = (signal >= value);
diff_locations = [false ; diff(locations)];
index = (diff_locations ==1);
This is for falling edge:
locations = (signal <= value);
diff_locations = [false ; diff(locations)];
index = (diff_locations == 1);

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