computing cwt only at scale 5
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I want to compute cwt at scale 5 to detect local maxima at this scale so I did this : cfs = cwt(x,5,'haar'); plot(cfs); Is my program correct or I need to use all scales from 1 to 5?
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Wayne King
2011-11-7
Hi Claire, yes, your code is correct, but are you sure you don't want to include at least a few more scales?
That can help in identifying local maxima lines:
load cuspamax;
x = 1:length(cuspamax);
scales = 1:32;
cfs = cwt(cuspamax,scales,'haar');
[lmaxima,indices] = localmax(cfs,[],false);
[iRow,iCol] = find(lmaxima);
subplot(211);
imagesc(abs(cfs)); axis xy;
axis([1 1024 1 32]);
ylabel('Scale'); title('CWT Coefficients (Moduli)');
subplot(212);
plot(x(iCol),scales(iRow),'marker','o','markerfacecolor',[0 0 1],...
'linestyle','none');
xlabel('Position'); ylabel('Scale'); title('Maxima Lines');
axis([1 1024 1 32]);
3 个评论
claire
2011-11-8
Wayne King
2011-11-8
No, Claire just as an example.
Jean-Luc Bruyelle
2015-7-9
How do we choose the appropriate scales using the same function ?
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