("Local" Empirical Mode Decomposition) computes a local version of EMD
[imf,ort,nbits] = emd_local(x) [imf,ort,nbits] = emd_local([],x) [imf,ort,nbits] = emd_local(t,x) [imf,ort,nbits] = emd_local([],x,stop) [imf,ort,nbits] = emd_local(t,x,stop) [imf,ort,nbits] = emd_local([],x,stop,tst) [imf,ort,nbits] = emd_local(t,x,stop,tst)
analyzed signal (line vector)
sampling times (line vector) (default : 1:length(x))
threshold, threshold2 and tolerance (optional) for sifting stopping criterion default : [0.05,0.5,0.05]
if equals to 1 shows sifting steps with pause if equals to 2 no pause
intrinsic mode functions (last line = residual)
index of orthogonality
number of iterations for each mode
stopping criterion for sifting : at each point : mean amplitude < threshold2*envelope amplitude & mean of boolean array ((mean amplitude)/(envelope amplitude) > threshold) < tolerance & |#zeros-#extrema|<=1
s = rand(1,512,'normal'); imf = emd_local(s); emd_visu(s,imf); | ![]() | ![]() |