compute_quadrant_selection.m

signal procesing toolbox

function [selx,sely] = compute_quadrant_selection(j,q, options)

% compute_quadrant_selection - compute the indices for selecting subband of a wavelet transform.
%
%   [selx,sely] = compute_quadrant_selection(j,q, options);
%
%   q=1 is for phi/psi (on X / on Y)
%   q=2 is for psi/phi (on X / on Y)
%   q=3 is for psi/psi (on X / on Y)
%
%   % Suppose that MW contains a wavelet transform 
%   j = 4; q = 2;
%   [selx,sely] = compute_quadrant_selection(j,q);
%   MWs = MW(selx,sely);    % MWs contains the quadrant.
%
%   Depending on the transform you are using, you should 
%   set options.transform to 
%       'isotropic2d' (default): 2D standard wavelet basis.
%       'quincunx': for quincunx transform (perform_quincunx_wavelet_transform).
%       
%
%   Copyright (c) 2004 Gabriel Peyr