Function WAVELET_2D_PYRAMID

Package

Short description

Usage

   [x_phi, x_psi] = WAVELET_2D_PYRAMID(x, filters, options)

Input

   x (numeric): the input signal
   filters (struct): a 2d pyramid filter bank, typically obtained with
       MORLET_FILTER_BANK_2D_PYRAMID
   options (struct): containing the following optional fields :
       J : the maximum scale
       precision : 'single' or 'double')
       j_min : the minimum scale to compute
       q_mask : a mask on the q (scale per octave) filter parameters
       all_low_pass : output all intermediate low pass filtering

Output

   x_phi (layer): x filtered with the low pass filter
   x_psi (layer): x filtered with all the high pass filters
   options (struct): the computed options

Description

   Compute the wavelet transform of input signal x with a FAST WAVELET
   TRANSFORM (FWT) http://en.wikipedia.org/wiki/Fast_wavelet_transform
   FWT is a cascade of alternate convolutions with conjugate mirror
   filters h and g, and downsampling. Convolutions are prefarably
   implemented in spatial domain.

See also

• morlet_filter_bank_2d_pyramid
• wavelet_layer_2d_pyramid
• conv_sub_2d