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upcoef

Direct reconstruction from 1-D wavelet coefficients

Syntax

Description

upcoef is a one-dimensional wavelet analysis function.

Y = upcoef(O,X,'wname',N) computes the N-step reconstructed coefficients of vector X.

'wname' is a string containing the wavelet name. See wfilters for more information.

N must be a strictly positive integer.

If O = 'a', approximation coefficients are reconstructed.

If O = 'd', detail coefficients are reconstructed.

Y = upcoef(O,X,'wname',N,L) computes the N-step reconstructed coefficients of vector X and takes the length-L central portion of the result.

Instead of giving the wavelet name, you can give the filters.

For Y = upcoef(O,X,Lo_R,Hi_R,N) or Y = upcoef(O,X,Lo_R,Hi_R,N,L), Lo_R is the reconstruction low-pass filter and Hi_R is the reconstruction high-pass filter.

Y = upcoef(O,X,'wname') is equivalent to Y = upcoef(O,X,'wname',1).

Y = upcoef(O,X,Lo_R,Hi_R) is equivalent to Y = upcoef(O,X,Lo_R,Hi_R,1).

Examples

Algorithm

upcoef is equivalent to an N time repeated use of the inverse wavelet transform.

See Also
idwt


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