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wavefilter.m in imageprocessing.rar

			
function [varargout] = wavefilter(wname, type)
%WAVEFILTER Create wavelet decomposition and reconstruction filters.
%   [VARARGOUT] = WAVEFILTER(WNAME, TYPE) returns the decomposition
%   and/or reconstruction filters used in the computation of the
%   forward and inverse FWT (fast wavelet transform). 
%
%   EXAMPLES:
%     [ld, hd, lr, hr] = wavefilter('haar') Get the low and highpass 
%                                           decomposition (ld, hd) 
%                                           and reconstruction 
%                                           (lr, hr) filters for 
%                                           wavelet 'haar'.
%     [ld, hd] = wavefilter('haar','d')     Get decomposition filters
%                                           ld and hd.
%     [lr, hr] = wavefilter('haar','r')     Get reconstruction 
%                                           filters lr and hr.
%
%   INPUTS:
%     WNAME             Wavelet Name
%     ---------------------------------------------------------
%     'haar' or 'db1'   Haar
%     'db4'             4th order Daubechies
%     'sym4'            4th order Symlets
%     'bior6.8'         Cohen-Daubechies-Feauveau biorthogonal
%     'jpeg9.7'         Antonini-Barlaud-Mathieu-Daubechies
%
%     TYPE              Filter Type
%     ---------------------------------------------------------
%     'd'               Decomposition filters
%     'r'               Reconstruction filters
%
%   See also WAVEFAST and WAVEBACK.

%   Copyright 2002-2004 R. C. Gonzalez, R. E. Woods, & S. L. Eddins
%   Digital Image Processing Using MATLAB, Prentice-Hall, 2004
%   $Revision: 1.5 $  $Date: 2003/10/13 01:09:39 $

% Check the input and output arguments.
error(nargchk(1, 2, nargin));

if (nargin == 1 & nargout ~= 4) | (nargin == 2 & nargout ~= 2)
   error('Invalid number of output arguments.'); 
end

if nargin == 1 & ~ischar(wname)
   error('WNAME must be a string.'); 
end

if nargin == 2 & ~ischar(type)
   error('TYPE must be a string.'			

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			... to be continued.

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