REPARTO_NIVELES returns the weight functions from a linear response model. Passing the result to respue_lin this scale DCTs in contrast for each channel, preparing them for the quantization. The result is equivalent to the inverse of a row of JPEG quantization matrices. This program allows you to generate multiple profiles sharing: Option = 1 of CSFs with scaling Kelly Mullen Option = 2 Ngan CSF for the achromatic channel and CSFs Kelly for chromatic Option = 3 low-pass filters with tunable frequency cut Option = 4 uniform Profile USE: [k1]=reparto_niveles(tam,fs,opcion,Fc); tam = DCT block size fs = sampling frequency (cl/grad) opcion = Profile Fc = cut frequency (option 3)
0001 % REPARTO_NIVELES returns the weight functions from a linear response model. 0002 % 0003 % Passing the result to respue_lin this scale DCTs in contrast for 0004 % each channel, preparing them for the quantization. The result is 0005 % equivalent to the inverse of a row of JPEG quantization matrices. 0006 % 0007 % This program allows you to generate multiple profiles sharing: 0008 % 0009 % Option = 1 of CSFs with scaling Kelly Mullen 0010 % 0011 % Option = 2 Ngan CSF for the achromatic channel and CSFs Kelly for chromatic 0012 % 0013 % Option = 3 low-pass filters with tunable frequency cut 0014 % 0015 % Option = 4 uniform Profile 0016 % 0017 % USE: [k1]=reparto_niveles(tam,fs,opcion,Fc); 0018 % 0019 % tam = DCT block size 0020 % fs = sampling frequency (cl/grad) 0021 % opcion = Profile 0022 % Fc = cut frequency (option 3) 0023 % 0024 0025 function k=deal_levels(tam,fs,opcion,Fc,Pesos); 0026 0027 f=linspace(0,fs/2-(fs/2)/tam,tam); 0028 0029 if opcion==1 0030 0031 factores_sobre_crom=[0.75 0.55]; 0032 0033 facfrecy=0.95; 0034 [IAFet,CSFy]=iafet(f,facfrecy,0,0,[0 0 0],0); 0035 0036 facfrecrg=2.5; 0037 [iaf_rg,CSFrg]=iafrg(f,0,facfrecrg,[0 0 0]); 0038 facfrecyb=1.8; 0039 [iaf_yb,CSFyb]=iafyb(f,0,facfrecyb,[0 0 0]); 0040 0041 CSFy=CSFy/maxi(CSFy); 0042 CSFrg=factores_sobre_crom(1)*CSFrg/maxi(CSFrg); 0043 CSFyb=factores_sobre_crom(2)*CSFyb/maxi(CSFyb); 0044 0045 k=[CSFy;CSFyb;CSFrg]; 0046 0047 elseif opcion==2 0048 0049 factores_sobre_crom=[0.75 0.55]; 0050 0051 [CSFy,logciaf]=ngan(fs/2-(fs/2)/tam,tam); 0052 0053 facfrecrg=2.5; 0054 [iaf_rg,CSFrg]=iafrg(f,0,facfrecrg,[0 0 0]); 0055 facfrecyb=1.8; 0056 [iaf_yb,CSFyb]=iafyb(f,0,facfrecyb,[0 0 0]); 0057 0058 CSFy=CSFy/maxi(CSFy); 0059 CSFrg=factores_sobre_crom(1)*CSFrg/maxi(CSFrg); 0060 CSFyb=factores_sobre_crom(2)*CSFyb/maxi(CSFyb); 0061 0062 k=[CSFy;CSFyb;CSFrg]; 0063 0064 elseif opcion==3 0065 0066 k=double([f<=Fc(1);f<=Fc(2);f<=Fc(3)]); 0067 0068 else 0069 0070 k=ones(3,tam); 0071 0072 end 0073 0074 k(1,:)=Pesos(1)*k(1,:); 0075 k(2,:)=Pesos(2)*k(2,:); 0076 k(3,:)=Pesos(3)*k(3,:); 0077