WINDOWONPPGRID
W operator, subband windowing on PPGRID with 2D iFFT
Contents
Description
Y = WINDOWONPPGRID(X,BETA,LEVEL)
x: array (2,(R*n)+1,n+1) : (sector,radial,slope) 2 sectors.
beta: 2 or 4; scaling factor 2^j or 4^j.
level: decomposition level, default to lowest possible level.
R: oversampling rate
y: digital shearlet coefficients which is a cell array:
each y{sector,scale,tile} is a complex-valued matrix, 2D FFT
sector runs through 4 values
scale runs through J approx log(N)/log(beta/2) values
tile runs through Ntile approx beta^scale values [OUCH!]Examples
R = 4; beta = 4;
img = imread('barbara.gif');
img = double(img);
pimg = ppFT(img,R);
shX = WindowOnPPGrid(pimg,beta,0);
size(shX)
Decomposition of high-frequency part...
scale = 5, Number of Tiles = 65
scale = 4, Number of Tiles = 33
scale = 3, Number of Tiles = 17
scale = 2, Number of Tiles = 9
scale = 1, Number of Tiles = 5
scale = 0, Number of Tiles = 3
scale = -1, Number of Tiles = 1
Decomposition of low frequency part...
Done!
ans =
4 8 65
See also
MEYER, BUMPV, NV, PARASCALE, ADJWINDOWONPPGRID.
Copyright
Copyright (C) 2011. Xiaosheng Zhuang, University of Osnabrueck