do_overlap

PURPOSE ^

function imagen = do_overlap(Im,M,N,ov)

SYNOPSIS ^

function imagen = do_overlap(Im,M,N,ov)

DESCRIPTION ^

   function imagen = do_overlap(Im,M,N,ov)

 Given an image with blocks of size MxM, it gives back
 an image with NxN blocks taking into acount ovelapping
 between blocks (to relax the transitions)

 Overlapping is preformed as in do_overlap

CROSS-REFERENCE INFORMATION ^

This function calls: This function is called by:

SOURCE CODE ^

0001 %   function imagen = do_overlap(Im,M,N,ov)
0002 %
0003 % Given an image with blocks of size MxM, it gives back
0004 % an image with NxN blocks taking into acount ovelapping
0005 % between blocks (to relax the transitions)
0006 %
0007 % Overlapping is preformed as in do_overlap
0008 %
0009 
0010 function imagen = do_overlap(Im,M,N,ov)
0011 
0012 a=(M-N)/2;
0013 v = [zeros(1,a-ov/2) linspace(0,1,ov) ones(1,M-2*(a-ov/2+ov)) linspace(1,0,ov) zeros(1,a-ov/2)];
0014 p = v'*v;
0015 
0016 [nv nh]=size(Im);
0017 
0018 nhor = nh/M;
0019 nver = nv/M;
0020 
0021 imagen = zeros(nhor*N,nver*N);
0022 
0023 for i=2:nver-1
0024    for j=2:nhor-1
0025       cf = 1;
0026       Algo = zeros(2*N+M);
0027       SumaPesos = zeros(2*N+M);
0028       for k=i-1:i+1
0029          cc = 1;
0030          for r=j-1:j+1
0031             B = Im( (k-1)*M+1:k*M, (r-1)*M+1:r*M);
0032             B = B.*p;
0033 
0034             Algo(cf:cf+M-1,cc:cc+M-1) = Algo(cf:cf+M-1,cc:cc+M-1)+B;
0035             SumaPesos(cf:cf+M-1,cc:cc+M-1) = SumaPesos(cf:cf+M-1,cc:cc+M-1) +p;
0036             cc = cc+N;
0037          end
0038          cf = cf + N;
0039       end
0040 
0041       Algo(SumaPesos~=0) = Algo(SumaPesos~=0)./SumaPesos(SumaPesos~=0);
0042 
0043       Bloque = Algo(M/2+N/2+1:M/2+N/2+N,M/2+N/2+1:M/2+N/2+N);
0044 
0045       imagen ((i-1)*N+1:i*N,(j-1)*N+1:j*N) = Bloque;
0046 
0047    end
0048 end
0049 
0050 i=1;
0051 
0052 for j=2:nhor-1
0053    cf = 1;
0054    Algo = zeros(M+N,2*N+M);
0055    SumaPesos = zeros(M+N,2*N+M);
0056    for k=i:i+1
0057       cc = 1;
0058       for r=j-1:j+1
0059          B = Im( (k-1)*M+1:k*M, (r-1)*M+1:r*M);
0060          B = B.*p;
0061 
0062          Algo(cf:cf+M-1,cc:cc+M-1) = Algo(cf:cf+M-1,cc:cc+M-1)+B;
0063          SumaPesos(cf:cf+M-1,cc:cc+M-1) = SumaPesos(cf:cf+M-1,cc:cc+M-1) +p;
0064          cc = cc+N;
0065       end
0066       cf = cf + N;
0067    end
0068 
0069    Algo(SumaPesos~=0) = Algo(SumaPesos~=0)./SumaPesos(SumaPesos~=0);
0070 
0071    Bloque = Algo(M/2-N/2+1:M/2-N/2+N,M/2+N/2+1:M/2+N/2+N);
0072 
0073    imagen ((i-1)*N+1:i*N,(j-1)*N+1:j*N) = Bloque;
0074 
0075 end
0076 
0077 i=nver;
0078 
0079 for j=2:nhor-1
0080    cf = 1;
0081    Algo = zeros(M+N,2*N+M);
0082    SumaPesos = zeros(M+N,2*N+M);
0083    for k=i-1:i
0084       cc = 1;
0085       for r=j-1:j+1
0086          B = Im( (k-1)*M+1:k*M, (r-1)*M+1:r*M);
0087          B = B.*p;
0088 
0089          Algo(cf:cf+M-1,cc:cc+M-1) = Algo(cf:cf+M-1,cc:cc+M-1)+B;
0090          SumaPesos(cf:cf+M-1,cc:cc+M-1) = SumaPesos(cf:cf+M-1,cc:cc+M-1) +p;
0091          cc = cc+N;
0092       end
0093       cf = cf + N;
0094    end
0095 
0096    Algo(SumaPesos~=0) = Algo(SumaPesos~=0)./SumaPesos(SumaPesos~=0);
0097 
0098    Bloque = Algo(M/2+N/2+1:M/2+N/2+N,M/2+N/2+1:M/2+N/2+N);
0099 
0100    imagen ((i-1)*N+1:i*N,(j-1)*N+1:j*N) = Bloque;
0101 
0102 end
0103 
0104 j=1;
0105 
0106 for i=2:nver-1
0107    cf = 1;
0108    Algo = zeros(2*N+M,M+N);
0109    SumaPesos = zeros(2*N+M,M+N);
0110    for k=i-1:i+1
0111       cc = 1;
0112       for r=j:j+1
0113          B = Im( (k-1)*M+1:k*M, (r-1)*M+1:r*M);
0114          B = B.*p;
0115 
0116          Algo(cf:cf+M-1,cc:cc+M-1) = Algo(cf:cf+M-1,cc:cc+M-1)+B;
0117          SumaPesos(cf:cf+M-1,cc:cc+M-1) = SumaPesos(cf:cf+M-1,cc:cc+M-1) +p;
0118          cc = cc+N;
0119       end
0120       cf = cf + N;
0121    end
0122 
0123    Algo(SumaPesos~=0) = Algo(SumaPesos~=0)./SumaPesos(SumaPesos~=0);
0124 
0125    Bloque = Algo(M/2+N/2+1:M/2+N/2+N,M/2-N/2+1:M/2-N/2+N);
0126 
0127    imagen ((i-1)*N+1:i*N,(j-1)*N+1:j*N) = Bloque;
0128 
0129 end
0130 
0131 j=nhor;
0132 
0133 for i=2:nver-1
0134    cf = 1;
0135    Algo = zeros(2*N+M,M+N);
0136    SumaPesos = zeros(2*N+M,M+N);
0137    for k=i-1:i+1
0138       cc = 1;
0139       for r=j-1:j
0140          B = Im( (k-1)*M+1:k*M, (r-1)*M+1:r*M);
0141          B = B.*p;
0142 
0143          Algo(cf:cf+M-1,cc:cc+M-1) = Algo(cf:cf+M-1,cc:cc+M-1)+B;
0144          SumaPesos(cf:cf+M-1,cc:cc+M-1) = SumaPesos(cf:cf+M-1,cc:cc+M-1) +p;
0145          cc = cc+N;
0146       end
0147       cf = cf + N;
0148    end
0149 
0150    Algo(SumaPesos~=0) = Algo(SumaPesos~=0)./SumaPesos(SumaPesos~=0);
0151 
0152    Bloque = Algo(M/2+N/2+1:M/2+N/2+N,M/2+N/2+1:M/2+N/2+N);
0153 
0154    imagen ((i-1)*N+1:i*N,(j-1)*N+1:j*N) = Bloque;
0155 
0156 end
0157 
0158 cf = 1;
0159 Algo = zeros(M+N,M+N);
0160 SumaPesos = zeros(M+N,M+N);
0161 
0162 i=1;
0163 j=1;
0164 
0165 for k=i:i+1
0166    cc = 1;
0167    for r=j:j+1
0168       B = Im( (k-1)*M+1:k*M, (r-1)*M+1:r*M);
0169       B = B.*p;
0170 
0171       Algo(cf:cf+M-1,cc:cc+M-1) = Algo(cf:cf+M-1,cc:cc+M-1)+B;
0172       SumaPesos(cf:cf+M-1,cc:cc+M-1) = SumaPesos(cf:cf+M-1,cc:cc+M-1) +p;
0173       cc = cc+N;
0174    end
0175    cf = cf + N;
0176 end
0177 
0178 Algo(SumaPesos~=0) = Algo(SumaPesos~=0)./SumaPesos(SumaPesos~=0);
0179 
0180 Bloque = Algo(M/2-N/2+1:M/2-N/2+N,M/2-N/2+1:M/2-N/2+N);
0181 
0182 imagen ((i-1)*N+1:i*N,(j-1)*N+1:j*N) = Bloque;
0183 
0184 cf = 1;
0185 Algo = zeros(M+N,M+N);
0186 SumaPesos = zeros(M+N,M+N);
0187 
0188 i=1;
0189 j=nhor;
0190 
0191 for k=i:i+1
0192    cc = 1;
0193    for r=j-1:j
0194       B = Im( (k-1)*M+1:k*M, (r-1)*M+1:r*M);
0195       B = B.*p;
0196 
0197       Algo(cf:cf+M-1,cc:cc+M-1) = Algo(cf:cf+M-1,cc:cc+M-1)+B;
0198       SumaPesos(cf:cf+M-1,cc:cc+M-1) = SumaPesos(cf:cf+M-1,cc:cc+M-1) +p;
0199       cc = cc+N;
0200    end
0201    cf = cf + N;
0202 end
0203 
0204 Algo(SumaPesos~=0) = Algo(SumaPesos~=0)./SumaPesos(SumaPesos~=0);
0205 
0206 Bloque = Algo(M/2-N/2+1:M/2-N/2+N,M/2+N/2+1:M/2+N/2+N);
0207 
0208 imagen ((i-1)*N+1:i*N,(j-1)*N+1:j*N) = Bloque;
0209 
0210 cf = 1;
0211 Algo = zeros(M+N,M+N);
0212 SumaPesos = zeros(M+N,M+N);
0213 
0214 i=nver;
0215 j=1;
0216 
0217 for k=i-1:i
0218    cc = 1;
0219    for r=j:j+1
0220       B = Im( (k-1)*M+1:k*M, (r-1)*M+1:r*M);
0221       B = B.*p;
0222 
0223       Algo(cf:cf+M-1,cc:cc+M-1) = Algo(cf:cf+M-1,cc:cc+M-1)+B;
0224       SumaPesos(cf:cf+M-1,cc:cc+M-1) = SumaPesos(cf:cf+M-1,cc:cc+M-1) +p;
0225       cc = cc+N;
0226    end
0227    cf = cf + N;
0228 end
0229 
0230 Algo(SumaPesos~=0) = Algo(SumaPesos~=0)./SumaPesos(SumaPesos~=0);
0231 
0232 Bloque = Algo(M/2+N/2+1:M/2+N/2+N,M/2-N/2+1:M/2-N/2+N);
0233 
0234 imagen ((i-1)*N+1:i*N,(j-1)*N+1:j*N) = Bloque;
0235 
0236 cf = 1;
0237 Algo = zeros(M+N,M+N);
0238 SumaPesos = zeros(M+N,M+N);
0239 
0240 i=nver;
0241 j=nhor;
0242 
0243 for k=i-1:i
0244    cc = 1;
0245    for r=j-1:j
0246       B = Im( (k-1)*M+1:k*M, (r-1)*M+1:r*M);
0247       B = B.*p;
0248 
0249       Algo(cf:cf+M-1,cc:cc+M-1) = Algo(cf:cf+M-1,cc:cc+M-1)+B;
0250       SumaPesos(cf:cf+M-1,cc:cc+M-1) = SumaPesos(cf:cf+M-1,cc:cc+M-1) +p;
0251       cc = cc+N;
0252    end
0253    cf = cf + N;
0254 end
0255 
0256 Algo(SumaPesos~=0) = Algo(SumaPesos~=0)./SumaPesos(SumaPesos~=0);
0257 
0258 Bloque = Algo(M/2+N/2+1:M/2+N/2+N,M/2+N/2+1:M/2+N/2+N);
0259 
0260 imagen ((i-1)*N+1:i*N,(j-1)*N+1:j*N) = Bloque;
0261 
0262

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