iimdpcm

PURPOSE ^

IIMDPCM invierts the image codification given by IMDPCM

SYNOPSIS ^

function I=iimdpcm(e,w,valor_relleno)

DESCRIPTION ^

 IIMDPCM invierts the image codification given by IMDPCM
 each pixel given a lineal combination of the neighbours
 (in a neighbouthood of N^2 size).

                         /  N                  \
   est(I([i,j]))= round |  sum w(d)*I([i,j]-d)  |
                         \ d=1                 /

 It gives back the prediction error for each point:

  e([i,j])=I(i,j)-est(I([i,j]))

 Given this error, the original signal can be reconstructed using IIMDPCM

 USE: I=iimdpcm(e,[w(1) w(2) w(3)...],valor_relleno);

CROSS-REFERENCE INFORMATION ^

This function calls: This function is called by:

SOURCE CODE ^

0001 % IIMDPCM invierts the image codification given by IMDPCM
0002 % each pixel given a lineal combination of the neighbours
0003 % (in a neighbouthood of N^2 size).
0004 %
0005 %                         /  N                  \
0006 %   est(I([i,j]))= round |  sum w(d)*I([i,j]-d)  |
0007 %                         \ d=1                 /
0008 %
0009 % It gives back the prediction error for each point:
0010 %
0011 %  e([i,j])=I(i,j)-est(I([i,j]))
0012 %
0013 % Given this error, the original signal can be reconstructed using IIMDPCM
0014 %
0015 % USE: I=iimdpcm(e,[w(1) w(2) w(3)...],valor_relleno);
0016 
0017 function I=iimdpcm(e,w,valor_relleno)
0018 
0019 l=length(w);
0020 s=size(e);
0021 a=valor_relleno*ones(l,s(2)+2*l);
0022 i=valor_relleno*ones(s(1),l);
0023 d=valor_relleno*ones(s(1),l);
0024 b=valor_relleno*ones(l,s(2)+2*l);
0025 e=[a;i e d;b];
0026 estI=e;
0027 I=valor_relleno*ones(s(1)+2*l,s(2)+2*l);
0028 
0029 W=simrev([w(1) w]);
0030 W(1,1)=0;
0031 W=rot90(W,2);
0032 W=W/sum(sum(W));
0033 
0034 for i=l+1:s(1)+l
0035 
0036     for j=l+1:s(2)+l
0037         bloc=I(i-l:i,j-l:j);
0038         estI(i,j)=round(sum(sum(W.*bloc)));
0039         I(i,j)=estI(i,j)+e(i,j);
0040     end
0041 end
0042 I=sacasub(I,[s(1)/2+l s(2)/2+l],[s(1) s(2)],0);

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