erosion and dilation in signal processing
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we need codes for erosion and dilation in signal processing...as imdilate and imerode functions can only be used in image processing..
采纳的回答
Image Analyst
2012-2-4
They can be used for 1D signals, if you have the Image Processing Toolbox. Do you have that toolbox? If not, you might play around with this approach:
windowSize = 3;
originalSignal = rand(10,1)
hank = hankel(originalSignal)
h3 = hank(:,1:windowSize)
dilatedSignal = max(h3, [], 2)
9 个评论
Annapoorani
2012-2-4
Image Analyst
2012-2-4
Why do you say "no"? Why shouldn't you be able to do it for an ECG signal. The procedures don't care what the signal is - they're all just a bunch of arbitrary numbers as far as they're concerned.
Walter Roberson
2012-2-4
I think the "no" might be for "Do you have that toolbox?"
Image Analyst
2012-2-4
Oh, right, probably so. The hankel though is in base MATLAB and with a little modification of the code to handle edge effects it could do it. Or else use a for loop and the max() and min() functions to do it the intuitive, brute force way. Erosion is the local min and dilation is the local max.
Annapoorani
2012-2-6
Annapoorani
2012-2-8
Image Analyst
2014-8-22
If you don't have the Image Processing Toolbox, then how did you try imdilate()?
John Cristion
2020-2-20
Kernel may need to be transposed
Image Analyst
2020-2-21
You can still view the dilated image even though you get a warning that says it will shrink it down to fit onto the screen. You can safely ignore that warning. It's not serious. If you want to see it pixel for pixel, use the zoom tool to zoom in.
更多回答（1 个）
shelley
2014-8-22
0 个投票
Yes, it is doable. It is better to binarize the signal first, and then use the command like
sel=strel('line',120,90);
%the length 120 depends on how big the gap you want to close/seal.
%the degree 90 or 0 depends on your 1D signal is in vector or row format;
results=imdilate(1Dsig,sel);
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