Denoise an eog signal

Question

Mahsa Rm 2021-7-31

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/889807-denoise-an-eog-signal

评论： Star Strider 2021-7-31

noisy.mat

I have a noisy eog signal and I want to clear it but I'm not familiar with different filters. I've tried wavelet denoising toolbox but i couldn't see much change in my signal. I've attached the mat file.

any help will be appreciated.

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Image Analyst 2021-7-31

I don't know what EOG is. What part of those signals is supposed to be noise and what part is good signal? Are those time domain signals or spectra?

Star Strider 2021-7-31

‘I don't know what EOG is.’

Electrooculogram.

Wikipedia: Electooculography

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Answer 1

Sulaymon Eshkabilov 2021-7-31

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https://ww2.mathworks.cn/matlabcentral/answers/889807-denoise-an-eog-signal#answer_757992

There are a few different filters to test with your data, e.g. data smooting, moving average, Savitzky-Golay, etc. You can test these ones by tuning and play with others, such as low-pass, band-pass filters.

figure
subplot(211)
plot(y1,'b')
y1_s=smoothdata(y1, 'sgolay');
hold on
plot(y1_s, 'r')
subplot(212)
plot(y2)
y2_s=smoothdata(y2, 'movmean', 50);
hold on
plot(y2_s)
figure
subplot(211)
plot(y3)
y3_s=smoothdata(y3, 'gaussian', 35);
hold on
plot(y3_s)
subplot(212)
plot(y4)
y4_s=smoothdata(y4, 'rlowess');
hold on
plot(y4_s)