Hi,

[sunyyhyzx]

Hi,

“getDWTRecCoeff” reconstructs the signal on a specific branch by
setting all other branch values to zero.

getDWTRecCoeff(double *coeff, int *length, const char *ctype, const
char *ext, int level, int J, double *lpr, double *hpr, int lf, int
siglength, double *reccoeff)

Here the two important inputs are ctype (values "appx" and "det") and
level which determine the branch to be reconstructed. One application
of getDWTRecCoeff is to obtain Multiresolution Analysis at a specific
branch that is synced with the output.

For example, one level periodic decomposition of a length 256 signal
will yield two length 128 approximation and detail signals. These
signals aren't very useful for direct eyeball analysis as their
lengths aren't the same as that of the input. You can build length 256
signal at both branches using getDWTRecCoeff.

I will soon add more documentation about this and 2D functionality
that I have implemented recently.

Rafat

On 5/21/19, sunyyhyzx [email protected] wrote:

Hi Rafat,

I do not konw the “getDWTRecCoeff” function very much. I can not find any
help for this function. can you give me an explanatory note to
Function“getDWTRecCoeff”?

And can you give an simple eample for using this function?

Any help much appreciated.

Thanks,

--Yanyun Sun From China

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#14

Originally posted by @rafat in #14 (comment)

[sunyyhyzx]

Hi，
Thank you for your warmly reply. I am a student, and now using your open code to learn the wavelet decomposition. I use function "modwt2(wt, inp)" to deconpose a grid named X and obtain the "wavecoeffs", Then I can use the function "getWT2Coeffs(wt, wavecoeffs, J, "A", &ir, &ic)" to obtain the approximation coeffs which has the same size with the input grid X. But I do not want obtain the coeffs , I want the reconstructed Wavelet Approximation Approximation throug the approximation coeffs, which function should I use?
Any help much appreciated.
Thank you very much! :)