wavecopy.m

冈萨雷斯的经典教材数字图像处理的matlab版源代码

function y = wavecopy(type, c, s, n)
%WAVECOPY Fetches coefficients of a wavelet decomposition structure.
%   Y = WAVECOPY(TYPE, C, S, N) returns a coefficient array based on
%   TYPE and N.  
%
%   INPUTS:
%     TYPE      Coefficient category
%     -------------------------------------
%     'a'       Approximation coefficients
%     'h'       Horizontal details
%     'v'       Vertical details
%     'd'       Diagonal details
%
%     [C, S] is a wavelet data structure.
%     N specifies a decomposition level (ignored if TYPE = 'a').
%
%   See also WAVEWORK, WAVECUT, and WAVEPASTE.

%   Copyright 2002-2004 R. C. Gonzalez, R. E. Woods, & S. L. Eddins
%   Digital Image Processing Using MATLAB, Prentice-Hall, 2004
%   $Revision: 1.4 $  $Date: 2003/10/13 01:20:41 $

error(nargchk(3, 4, nargin));
if nargin == 4   
   y = wavework('copy', type, c, s, n);
else  
   y = wavework('copy', type, c, s);  
end