d2fldwt9_7.m

SPIHT的MATLAB源代码,希望对有需要的朋友有所帮助.

function dwt_img=d2fldwt9_7(img,level)
%
% dwt_img=d2fldwt9_7(img,level)
%
% The back lifting discrete 2-D wavelet transform (D2BLDWT) using the 9-7 Antonini filters 
 [x,y]=size(img);
 dwt_img=img;
 xx=x;
 yy=y;
 for i=1:level
     
     for  k=1:xx
         [app_sig,det_sig] = fldwt9_7(dwt_img(k,1:yy));
         dwt_img(k,1:yy)=[app_sig,det_sig];
     end
     
     for l=1:yy
         [app_sig,det_sig] = fldwt9_7(dwt_img(1:xx,l));
         dwt_img(1:xx,l)=[app_sig;det_sig];
     end
     xx=xx/2;
     yy=yy/2;
 end