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Copy pathArithmetic_Decoding_blk_csf_lab_lin_ksii.m
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Arithmetic_Decoding_blk_csf_lab_lin_ksii.m
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function [blk,idx] = Arithmetic_Decoding_blk_csf_lab_lin_ksii(Seq, FileName, dc, blksz, flag)
% load('Nmat.mat');
% load('Cnmat.mat');
%load('Table.mat');
% if(flag==1)
% mat = Nmat;
% else
% mat = Cnmat;
% end
m = blksz(1,1);
n = blksz(1,2);
% CSF based quantization matrices for different block sizes:-
if(flag==1)
if(m==8)&&(n==8)
load(fullfile(FileName,'quant_lin8.mat'));
%quant8(1,1) = 20;
quant = quant_lin;
elseif(m==8)&&(n==16)
load(fullfile(FileName,'quant_lin816.mat'));
%quant8_16(1,1) = 25;
quant = quant_lin;
elseif(m==8)&&(n==24)
load(fullfile(FileName,'quant_lin824.mat'));
%quant8_16(1,1) = 25;
quant = quant_lin;
elseif(m==8)&&(n==32)
load(fullfile(FileName,'quant_lin832.mat'));
%quant8_16(1,1) = 25;
quant = quant_lin;
elseif(m==16)&&(n==8)
load(fullfile(FileName,'quant_lin168.mat'));
%quant16_8(1,1) = 25;
quant = quant_lin;
elseif(m==16)&&(n==16)
load(fullfile(FileName,'quant_lin16.mat'));
%quant16(1,1) = 30;
quant = quant_lin;
elseif(m==16)&&(n==24)
load(fullfile(FileName,'quant_lin1624.mat'));
%quant16_24(1,1) =35;
quant = quant_lin;
elseif(m==16)&&(n==32)
load(fullfile(FileName,'quant_lin1632.mat'));
%quant16_24(1,1) =35;
quant = quant_lin;
elseif(m==24)&&(n==8)
load(fullfile(FileName,'quant_lin248.mat'));
%quant24_16(1,1) = 35;
quant = quant_lin;
elseif(m==24)&&(n==16)
load(fullfile(FileName,'quant_lin2416.mat'));
%quant24_16(1,1) = 35;
quant = quant_lin;
elseif(m==24)&&(n==24)
load(fullfile(FileName,'quant_lin24.mat'));
%quant24(1,1) = 40;
quant = quant_lin;
elseif(m==24)&&(n==32)
load(fullfile(FileName,'quant_lin2432.mat'));
%quant24_32(1,1) = 45;
quant = quant_lin;
elseif(m==32)&&(n==8)
load(fullfile(FileName,'quant_lin328.mat'));
%quant32_24(1,1) = 45;
quant = quant_lin;
elseif(m==32)&&(n==16)
load(fullfile(FileName,'quant_lin3216.mat'));
%quant32_24(1,1) = 45;
quant = quant_lin;
elseif(m==32)&&(n==24)
load(fullfile(FileName,'quant_lin3224.mat'));
%quant32_24(1,1) = 45;
quant = quant_lin;
elseif(m==32)&&(n==32)
load(fullfile(FileName,'quant_lin32.mat'));
%quant32(1,1) = 50;
quant = quant_lin;
end
%quant = quant*2;
else
if(m==8)&&(n==8)
load(fullfile(FileName,'quant_lin_ab8.mat'));
%quant8(1,1) = 20;
quant = quant_lin;
elseif(m==8)&&(n==16)
load(fullfile(FileName,'quant_lin_ab816.mat'));
%quant8_16(1,1) = 25;
quant = quant_lin;
elseif(m==8)&&(n==24)
load(fullfile(FileName,'quant_lin_ab824.mat'));
%quant8_16(1,1) = 25;
quant = quant_lin;
elseif(m==8)&&(n==32)
load(fullfile(FileName,'quant_lin_ab832.mat'));
%quant8_16(1,1) = 25;
quant = quant_lin;
elseif(m==16)&&(n==8)
load(fullfile(FileName,'quant_lin_ab168.mat'));
%quant16_8(1,1) = 25;
quant = quant_lin;
elseif(m==16)&&(n==16)
load(fullfile(FileName,'quant_lin_ab16.mat'));
%quant16(1,1) = 30;
quant = quant_lin;
elseif(m==16)&&(n==24)
load(fullfile(FileName,'quant_lin_ab1624.mat'));
%quant16_24(1,1) =35;
quant = quant_lin;
elseif(m==16)&&(n==32)
load(fullfile(FileName,'quant_lin_ab1632.mat'));
%quant16_24(1,1) =35;
quant = quant_lin;
elseif(m==24)&&(n==8)
load(fullfile(FileName,'quant_lin_ab248.mat'));
%quant24_16(1,1) = 35;
quant = quant_lin;
elseif(m==24)&&(n==16)
load(fullfile(FileName,'quant_lin_ab2416.mat'));
%quant24_16(1,1) = 35;
quant = quant_lin;
elseif(m==24)&&(n==24)
load(fullfile(FileName,'quant_lin_ab24.mat'));
%quant24(1,1) = 40;
quant = quant_lin;
elseif(m==24)&&(n==32)
load(fullfile(FileName,'quant_lin_ab2432.mat'));
%quant24_32(1,1) = 45;
quant = quant_lin;
elseif(m==32)&&(n==8)
load(fullfile(FileName,'quant_lin_ab328.mat'));
%quant32_24(1,1) = 45;
quant = quant_lin;
elseif(m==32)&&(n==16)
load(fullfile(FileName,'quant_lin_ab3216.mat'));
%quant32_24(1,1) = 45;
quant = quant_lin;
elseif(m==32)&&(n==24)
load(fullfile(FileName,'quant_lin_ab3224.mat'));
%quant32_24(1,1) = 45;
quant = quant_lin;
elseif(m==32)&&(n==32)
load(fullfile(FileName,'quant_lin_ab32.mat'));
%quant32(1,1) = 50;
quant = quant_lin;
end
%quant = quant*1.5;
end
%quant = 2*quant;
% Nmat_new = round(Nmat_new);
% Arithmetic Decoding of AC Coefficients:
p = 0;
k = 1;
while(k<=(m*n - 1))
p = p + 1;
D = str2num(Seq(p));
if(D==1)
Ir(1,k:(m*n - 1)) = 0;
break;
else
p = p + 1;
D = str2num(Seq(p));
while(D==0)
Ir(1,k) = 0;
k = k + 1;
p = p + 1;
D = str2num(Seq(p));
end
% Decode V:
% Decode Sign of V:
p = p + 1;
D = str2num(Seq(p));
if(D==1)
Sgn = 'neg';
else
Sgn = 'pos';
end
% Decode log2(Sz):
n1 = 0;
p = p + 1;
D = str2num(Seq(p));
while(D)
n1 = n1 + 1;
p = p + 1;
D = str2num(Seq(p));
end
n1 = n1 - 1;
if(n1==0)
Sz = 1;
elseif(n1>0)
%base = 2^n;
Szr = bin2dec(Seq(p+1:p+n1));
Sz = Szr + (2^n1);
p = p + n1;
else
Sz = 0;
end
abV = Sz + 1;
if(Sgn=='pos')
V = abV;
else
V = -abV;
end
Ir(1,k) = V;
k = k + 1;
end
end
idx = p;
Irev_y = [dc Ir];
% Zigzag reordering:
sm = m+n-1;
s = 1;
bq(1,1) = Irev_y(s,1);
z = 2;
k = 1;
if(m>n)
n1 = min(m,n);
m1 = max(m,n);
for y = 3:sm
if(y<(n1+2))
if(mod(y,2)==1)
k = 1;
while((y-k)>0)
bq(k,y-k) = Irev_y(s,z);
k = k + 1;
z = z + 1;
end
else
l = 1;
while(((y-l)>0)&&(y<=n1))
bq(y-l,l) = Irev_y(s,z);
l = l + 1;
z = z + 1;
end
end
elseif((y>=(n1+2))&&(y<(m1+2)))
if(mod(y,2)==1)
l = n;
k = y-l;
while((y-k)>0)
bq(k,y-k) = Irev_y(s,z);
k = k + 1;
z = z + 1;
end
else
l = 1;
while(((y-l)>=0)&&(l<=n1))
bq(y-l,l) = Irev_y(s,z);
l = l + 1;
z = z + 1;
end
end
else
if(mod(y,2)==1)
l = n;
k = y-l;
while(((y-k)>0)&&(k<=m1))
bq(k,y-k) = Irev_y(s,z);
k = k + 1;
z = z + 1;
end
else
l = m;
k = y-l;
while(((y-k)>=0)&&(k<=n1))
bq(y-k,k) = Irev_y(s,z);
k = k + 1;
z = z + 1;
end
end
end
end
elseif(m<n)
n1 = min(m,n);
m1 = max(m,n);
for y = 3:sm
if(y<(n1+2))
if(mod(y,2)==1)
k = 1;
while((y-k)>0)
bq(k,y-k) = Irev_y(s,z);
k = k + 1;
z = z + 1;
end
else
l = 1;
while(((y-l)>0)&&(y<=n1))
bq(y-l,l) = Irev_y(s,z);
l = l + 1;
z = z + 1;
end
end
elseif((y>=(n1+2))&&(y<(m1+2)))
if(mod(y,2)==1)
k = 1;
while(((y-k)>0)&&(k<=n1))
bq(k,y-k) = Irev_y(s,z);
k = k + 1;
z = z + 1;
end
else
k = n1;
l = y-k;
while((y-l)>0)
bq(y-l,l) = Irev_y(s,z);
l = l + 1;
z = z + 1;
end
end
else
if(mod(y,2)==1)
l = n;
k = y-l;
while(((y-k)>0)&&(k<=n1))
bq(k,y-k) = Irev_y(s,z);
k = k + 1;
z = z + 1;
end
else
l = m;
k = y-l;
while(((y-k)>=0)&&(k<=m1))
bq(y-k,k) = Irev_y(s,z);
k = k + 1;
z = z + 1;
end
end
end
end
elseif(m==n)
for y = 3:sm
if(y<(m+2))
if(mod(y,2)==1)
k = 1;
while((y-k)>0)
bq(k,y-k) = Irev_y(s,z);
k = k + 1;
z = z + 1;
end
else
l = 1;
while((y-l)>0)
bq(y-l,l) = Irev_y(s,z);
l = l + 1;
z = z + 1;
end
end
else
if(mod(y,2)==1)
l = m;
k = y-l;
while((l-k)>=0)
bq(k,y-k) = Irev_y(s,z);
k = k + 1;
z = z + 1;
end
else
k = n;
l = y-k;
while((k-l)>=0)
bq(y-l,l) = Irev_y(s,z);
l = l + 1;
z = z + 1;
end
end
end
end
end
bq(m,n) = Irev_y(s,z);
if(flag==1)
sh = 128;
else
sh = 0;
end
% Reverse Quantization:
bdct = bq; %.*quant;
% Inverse DCT:
bshifted = idct2(bdct);
% Level shifting:
blk = bshifted + sh;
end