0001 0002 function [ristra,dctq,TheRealCode,ImR,DC] = epifanio03_decoder(directorio,fichero) 0003 trayfich = 'estarereB'; 0004 0005 load(trayfich); 0006 Lb = 16; 0007 Li = 256; 0008 0009 cd(directorio) 0010 unzip([fichero '.zip']); 0011 ristra = read_code_epifanio03([fichero '.bin']); 0012 0013 delete([fichero '.bin']); 0014 TheCode = zeros(256,255); 0015 0016 normaliz = [1 0]; 0017 extr_err = ristra(1:2); 0018 QE = reshape(ristra(3:2+256),16,16); 0019 uCP = ristra(259); 0020 0021 ristra = ristra(260:end); 0022 0023 [TheCode] = inv_rle(ristra); 0024 0025 NumNiv = 2^uCP; 0026 M = 10; 0027 0028 TheRealCode = TheCode * M / NumNiv; 0029 0030 Nc = round(0.9 * 40); 0031 qe = (extr_err(2) - extr_err(1)) * QE / (Nc - 1) + extr_err(1); 0032 0033 Lmq = iimdpcm(qe,1,100); 0034 DC = 16 * Lmq; 0035 0036 fprintf('Recovering the image:\n'); 0037 fprintf(' Inverting from r to dct\n'); 0038 z = 1; 0039 invgrad = inv(grad); 0040 for i = 1:Lb:(Li-1) 0041 for j = 1:Lb:(Li-1) 0042 0043 signo1 = sign(TheRealCode(z,:)'); 0044 signo1(signo1 == 0) = 1; 0045 signo1 = [1; signo1]; 0046 0047 irrq = signo1 .* adctm + signo1 .* (invgrad * V2 * [0; abs(TheRealCode(z,:)')]); 0048 irrq = dezigzag(irrq); 0049 0050 dc(2:Lb,1) = irrq(2:Lb,1) * DC(round(i/Lb)+1,round(j/Lb)+1) / 2; 0051 dc(1,2:Lb) = irrq(1,2:Lb) * DC(round(i/Lb)+1,round(j/Lb)+1) / 2; 0052 dc(2:Lb,2:Lb) = irrq(2:Lb,2:Lb) * DC(round(i/Lb)+1,round(j/Lb)+1) / 4; 0053 dc(1,1) = DC(round(i/Lb)+1,round(j/Lb)+1); 0054 0055 dctq(i:(i+(Lb-1)),j:(j+(Lb-1))) = dc; 0056 z = z + 1; 0057 end 0058 end 0059 fprintf(' Inverting from dct to spatial domain\n'); 0060 ImR = real(idct2r(dctq,4)); 0061