svr_dct_decoder

PURPOSE ^

It decompress a file created using 'svr_dct_encoder' and it recovers the image

SYNOPSIS ^

function [ImR] = svr_dct_decoder(H,directorio,fichero)

DESCRIPTION ^

 It decompress a file created using 'svr_dct_encoder' and it recovers the image

 USE: [ImR] = svr_dct_decoder(H,directorio,fichero)

 where:

 H          -> Regression Kernel
 directorio -> Folder where the file to decompress is
 fichero    -> Name of the .zip file (whithout extension) to decompress

CROSS-REFERENCE INFORMATION ^

This function calls: This function is called by:

SOURCE CODE ^

0001 % It decompress a file created using 'svr_dct_encoder' and it recovers the image
0002 %
0003 % USE: [ImR] = svr_dct_decoder(H,directorio,fichero)
0004 %
0005 % where:
0006 %
0007 % H          -> Regression Kernel
0008 % directorio -> Folder where the file to decompress is
0009 % fichero    -> Name of the .zip file (whithout extension) to decompress
0010 
0011 function [ImR] = svr_dct_decoder(H,directorio,fichero)
0012 Lb = 16;
0013 Li = 256;
0014 
0015 cd(directorio)
0016 unzip([fichero '.zip']);
0017 ristra = read_code_svr_dct([fichero '.bin']);
0018 
0019 delete([fichero '.bin']);
0020 TheCode = zeros(256,255);
0021 
0022 normaliz = [3 ristra(1)];
0023 extr_err = ristra(2:3);
0024 QE = reshape(ristra(4:3+256),16,16);
0025 bits = ristra(260) / 10;
0026 
0027 ristra = ristra(261:end);
0028 
0029 [TheCode] = inv_rle(ristra);
0030 
0031 NumNiv = 2^bits;
0032 MM = 0.8;
0033 
0034 TheRealCode = TheCode * MM / NumNiv;
0035 
0036 N = round(0.9 * 40);
0037 qe = (extr_err(2) - extr_err(1)) * QE / (N - 1) + extr_err(1);
0038 
0039 Lmq = iimdpcm(qe,1,100);
0040 
0041 fprintf('Recovering the image:\n');
0042 fprintf('  Inverting from SVM weights to dct\n');
0043 z=1;
0044 dctc1 = zeros(Li,Li);
0045 
0046 for i=1:Lb:Li
0047     for j=1:Lb:Li
0048 
0049         y = H * TheRealCode(z,:)';
0050 
0051         y = abs(y);
0052         signosr = TheRealCode(z,:) < 0;
0053         signosr = signosr';
0054         y = y.*(signosr == 0) - y.*(signosr > 0);
0055         y = [0; y];
0056         A = dezigzag(y);
0057         dctc1(i:(i+(Lb-1)),j:(j+(Lb-1))) = A;
0058 
0059         z = z+1;
0060     end
0061 end
0062 fprintf('  Inverting from dct to spatial domain\n');
0063 
0064 dctc1i = icontra2(dctc1,Lmq,4,normaliz);
0065 
0066 ImR = real(idct2r(dctc1i,4));

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