7.00.02 - IDWT - Aster Analytics

Teradata Aster® Analytics Foundation User GuideUpdate 2

Product
Aster Analytics
Release Number
7.00.02
Published
September 2017
Content Type
Programming Reference
User Guide
Publication ID
B700-1022-700K
Language
English (United States)
Last Update
2018-04-17

The IDWT function is the inverse of DWT; that is, IDWT applies inverse wavelet transforms on multiple sequences simultaneously. IDWT takes as input the output table and meta table generated by DWT and outputs the sequences in time domain. (Because the IDWT output is comparable to the DWT input, the inverse transformation is also called the reconstruction.)



A typical IDWT use case is:

  1. Apply DWT to sequences to generate their coefficients and corresponding metadata.
  2. Filter the coefficients by methods appropriate for the objects (for example, minimum threshold or top n coefficients).
  3. Apply IDWT to the filtered coefficients to reconstruct the sequences.
  4. Compare the reconstructed sequences to their original counterparts.