wavecut.m

来自「冈萨雷斯的经典教材数字图像处理的matlab版源代码」· M 代码 · 共 31 行

function [nc, y] = wavecut(type, c, s, n)
%WAVECUT Zeroes coefficients in a wavelet decomposition structure.
%   [NC, Y] = WAVECUT(TYPE, C, S, N) returns a new decomposition
%   vector whose detail or approximation coefficients (based on TYPE
%   and N) have been zeroed. The coefficients that were zeroed are
%   returned in Y.
%
%   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, WAVECOPY, 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 01:20:09 $

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