0001 0002 function [ImR] = epifanio03_decoder_v2(directorio,fichero,signos_dct) 0003 M = 10; 0004 trayfich = 'estarereB'; 0005 0006 load(trayfich); 0007 invgrad=inv(grad); 0008 Lb = 16; 0009 Li = 256; 0010 0011 cd(directorio) 0012 unzip([fichero '.zip']); 0013 ristra = read_code_epifanio03([fichero '.bin']); 0014 0015 delete([fichero '.bin']); 0016 TheCode = zeros(256,255); 0017 0018 extr_err = ristra(1:2); 0019 size(extr_err) 0020 QE = reshape(ristra(3:2+256),16,16); 0021 size(QE) 0022 uCP = ristra(259) 0023 0024 ristra = ristra(260:end); 0025 0026 [TheCode] = inv_rle(ristra); 0027 0028 TheCode = [zeros(Li,1) TheCode]; 0029 0030 TheRealCode = TheCode .* M/(2^uCP); 0031 0032 signos = sign(TheRealCode); 0033 signos(signos == 0) = 1; 0034 mis_signos = signos; 0035 0036 Nc = round(0.9 * 40); 0037 qe = (extr_err(2) - extr_err(1)) * QE / (Nc - 1) + extr_err(1); 0038 0039 Lmq = iimdpcm(qe,1,100); 0040 0041 fprintf('Recovering the image:\n'); 0042 fprintf(' Inverting from r to dct\n'); 0043 z = 1; 0044 dctc = zeros(Li,Li); 0045 for i = 1:Lb:Li 0046 for j = 1:Lb:Li-1 0047 0048 bloque = TheRealCode(z,:)'; 0049 0050 signo_b = signos(z,:)'; 0051 0052 inversion = signos_dct(z,:)' .* adctm + signos_dct(z,:)' .* (invgrad * V2 * bloque); 0053 bloque_inv = dezigzag(inversion); 0054 0055 dctc(i:i+Lb-1,j:j+Lb-1) = bloque_inv; 0056 z = z+1; 0057 end 0058 end 0059 fprintf(' Inverting from dct to spatial domain\n'); 0060 0061 dcti = icontrast_2(dctc,Lmq,4,[1 0]); 0062 0063 ImR = real(idct2r(dcti,4));