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what is the scaling function on wavelet in the matlab?

Asked by mohammad ahmadzade on 12 Jun 2017
Latest activity Answered by Wayne King
on 19 Jun 2017
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1 Answer

Answer by Wayne King
on 19 Jun 2017

Hi Mohammad, I'm not sure this question is complete since you just wrote "1" in the body. The scaling function provides the low frequency (DC components) or very long scale representation of the signal (or image). Recall that a wavelet by definition has zero mean which means the Fourier transform at \omega = 0 (or whatever Fourier variable you like to use) is equal to zero. If you want to recover a DC shift in a signal or image, then you need the scaling function.

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