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STS_Encoder.m
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457 lines (454 loc) · 19.5 KB
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function Stream = STS_Encoder(S,rate,L)
bitcount = 0;I = 0;size_LB = 0;size_UB = 0;
while bitcount < rate*size(S,1)*size(S,2)
if I == 0 % INITIALIZATION
% wavelet decomposition level can be defined by users manually.
[R,C] = size(S);
Sig = zeros(R,C);
BL = zeros(R/2,C/2);
[br,bc] = size(BL);
BL(br/2+1:br,1:bc) = 3;
BL(1:br/2,bc/2+1:bc) = 3;
% BL can have values of 0,3,4,5,7
M = max(max(S));
n = floor(log(M)/log(2));
T = 2^n; % THRESHOLD
Stream = {};
iter = 1;
BL(1:R/(2^(L)),1:C/(2^(L))) = 4;bitcount = 0;
I = 1; mm = 1;
elseif I == 1 % REFINEMENT PASS
if bitcount >= rate*size(S,1)*size(S,2)
break
end
[x,y] = find(BL >= 4); % Block by block and like this (1,1) (2,1)...(1,2),(2,2)...(1,3),(2,3)...
n = numel(x); % Number of significant blocks
BS = [];
for ii= 1:n
if bitcount >= rate*size(S,1)*size(S,2)
break
end
if Sig(2*x(ii)-1,2*y(ii)-1) == 0
if S(2*x(ii)-1,2*y(ii)-1) >= T
BS = [BS 1 0];
bitcount = bitcount + 2;
S(2*x(ii)-1,2*y(ii)-1) = S(2*x(ii)-1,2*y(ii)-1) - T;
Sig(2*x(ii)-1,2*y(ii)-1) = 1;
elseif S(2*x(ii)-1,2*y(ii)-1) <= -T
BS = [BS 1 1];
bitcount = bitcount + 2;
S(2*x(ii)-1,2*y(ii)-1) = S(2*x(ii)-1,2*y(ii)-1) + T;
Sig(2*x(ii)-1,2*y(ii)-1) = 1;
else
BS = [BS 0];
bitcount = bitcount + 1;
end
else
if S(2*x(ii)-1,2*y(ii)-1) >= T
S(2*x(ii)-1,2*y(ii)-1) = S(2*x(ii)-1,2*y(ii)-1) - T;
BS = [BS 1];
bitcount = bitcount + 1;
elseif S(2*x(ii)-1,2*y(ii)-1) <= -T
BS = [BS 1];
bitcount = bitcount + 1;
S(2*x(ii)-1,2*y(ii)-1) = S(2*x(ii)-1,2*y(ii)-1) + T;
else
BS = [BS 0];
bitcount = bitcount + 1;
end
end
if Sig(2*x(ii)-1,2*y(ii)) == 0
if S(2*x(ii)-1,2*y(ii)) >= T
Sig(2*x(ii)-1,2*y(ii)) = 1;
S(2*x(ii)-1,2*y(ii)) = S(2*x(ii)-1,2*y(ii)) - T;
BS = [BS 1 0];
bitcount = bitcount + 2;
elseif S(2*x(ii)-1,2*y(ii)) <= -T
BS = [BS 1 1];
bitcount = bitcount + 2;
Sig(2*x(ii)-1,2*y(ii)) = 1;
S(2*x(ii)-1,2*y(ii)) = S(2*x(ii)-1,2*y(ii)) + T;
else
BS = [BS 0];
bitcount = bitcount + 1;
end
else
if S(2*x(ii)-1,2*y(ii)) >= T
BS = [BS 1];
bitcount = bitcount + 1;
S(2*x(ii)-1,2*y(ii)) = S(2*x(ii)-1,2*y(ii)) - T;
elseif S(2*x(ii)-1,2*y(ii)) <= -T
BS = [BS 1];
bitcount = bitcount + 1;
S(2*x(ii)-1,2*y(ii)) = S(2*x(ii)-1,2*y(ii)) + T;
else
BS = [BS 0];
bitcount = bitcount + 1;
end
end
if Sig(2*x(ii),2*y(ii)-1) == 0
if S(2*x(ii),2*y(ii)-1) >= T
BS = [BS 1 0];
bitcount = bitcount + 2;
Sig(2*x(ii),2*y(ii)-1) = 1;
S(2*x(ii),2*y(ii)-1) = S(2*x(ii),2*y(ii)-1) - T;
elseif S(2*x(ii),2*y(ii)-1) <= -T
BS = [BS 1 1];
bitcount = bitcount + 2;
S(2*x(ii),2*y(ii)-1) = S(2*x(ii),2*y(ii)-1) + T;
Sig(2*x(ii),2*y(ii)-1) = 1;
else
BS = [BS 0];
bitcount = bitcount + 1;
end
else
if S(2*x(ii),2*y(ii)-1) >= T
BS = [BS 1];
bitcount = bitcount + 1;
S(2*x(ii),2*y(ii)-1) = S(2*x(ii),2*y(ii)-1) - T;
elseif S(2*x(ii),2*y(ii)-1) <= -T
BS = [BS 1];
bitcount = bitcount + 1;
S(2*x(ii),2*y(ii)-1) = S(2*x(ii),2*y(ii)-1) + T;
else
BS = [BS 0];
bitcount = bitcount + 1;
end
end
if Sig(2*x(ii),2*y(ii)) == 0
if S(2*x(ii),2*y(ii)) >= T
BS = [BS 1 0];
bitcount = bitcount + 2;
Sig(2*x(ii),2*y(ii)) = 1;
S(2*x(ii),2*y(ii)) = S(2*x(ii),2*y(ii)) - T;
elseif S(2*x(ii),2*y(ii)) <= -T
BS = [BS 1 1];
bitcount = bitcount + 2;
Sig(2*x(ii),2*y(ii)) = 1;
S(2*x(ii),2*y(ii)) = S(2*x(ii),2*y(ii)) + T;
else
BS = [BS 0];
bitcount = bitcount + 1;
end
else
if S(2*x(ii),2*y(ii)) >= T
BS = [BS 1];
bitcount = bitcount + 1;
S(2*x(ii),2*y(ii)) = S(2*x(ii),2*y(ii)) - T;
elseif S(2*x(ii),2*y(ii)) <= -T
BS = [BS 1];
bitcount = bitcount + 1;
S(2*x(ii),2*y(ii)) = S(2*x(ii),2*y(ii)) + T;
else
BS = [BS 0];
bitcount = bitcount + 1;
end
end;
end
I = 2;k = 0;%whos BS;
i = 1; j = 1;sub = 1;UB = [];
elseif I == 2 % SIGNIFICANCE PASS
while (i <= R/(2^(L+1)) && j <= C/(2^(L+1)))
if bitcount >= rate*size(S,1)*size(S,2)
break
end
%%%%%%%%%%% INITIALIZE LB and UB %%%%%%%%%%%%%%%%%%%%
if sub == 1 %LH
BL_addr_x = i; BL_addr_y = j + C/(2^(L+1)); % LH
elseif sub == 2 %HL
BL_addr_x = i + R/(2^(L+1)); BL_addr_y = j; % HL
else %HH
BL_addr_x = i + R/(2^(L+1)); BL_addr_y = j + C/(2^(L+1)); % HH
end
% BL_addr gives the address of blocks in LH5, HL5 and HH5
% which are themselves already significant, as initialized
if BL(BL_addr_x,BL_addr_y) == 7
% Can be either 7 or 4 or 5 coz initially set to 4
if sub < 3
sub = sub + 1;
else
sub = 1;
if j < C/(2^(L+1))
j = j + 1;
else
j = 1;
i = i + 1;
end
end
else
if BL(BL_addr_x,BL_addr_y) == 4
[flag,LB] = descendant_map(BL_addr_x,BL_addr_y,S,T);
if flag == 0 % i.e it has insignificant descendants
BS = [BS 0 0 0 0];LB = []; % WHY four zeros if all blocks insig?
bitcount = bitcount + 4;
if sub < 3
sub = sub + 1;
else
sub = 1;
if j < C/(2^(L+1))
j = j + 1;
else
j = 1;
i = i + 1;
end
end
else
UB = [BL_addr_x, BL_addr_y];
BL(BL_addr_x,BL_addr_y) = 5;
end
elseif BL(BL_addr_x,BL_addr_y) == 5
UB = [BL_addr_x, BL_addr_y];
LB = [];
for i3 = 1:4
if i3 == 1
x1 = 2*BL_addr_x-1;y1 = 2*BL_addr_y-1;
elseif i3 == 2
x1 = 2*BL_addr_x-1;y1 = 2*BL_addr_y;
elseif i3 == 3
x1 = 2*BL_addr_x;y1 = 2*BL_addr_y-1;
else
x1 = 2*BL_addr_x;y1 = 2*BL_addr_y;
end
if BL(x1,y1) ~= 7
LB = [LB;x1, y1];
end
end
end
end
%%%%%%%% LB and UB INITIALIZED %%%%%%%%%%%%%%%%%
%%%%%%%% Generation of Bitstream and partial updation of BL %%%%%%
while size(LB,1) ~= 0
if bitcount >= rate*size(S,1)*size(S,2)
break
end
% if size_LB < size(LB,1)
% size_LB = size(LB,1)
% end
% Temporary Bitstreams Generation
if BL(LB(1,1),LB(1,2)) <= 3
%if current block insignificant
BS1 = [];
for k = 1:4
if k == 1
x1 = 2*LB(1,1) - 1; y1 = 2*LB(1,2) - 1;
elseif k == 2
x1 = 2*LB(1,1) - 1; y1 = 2*LB(1,2);
elseif k == 3
x1 = 2*LB(1,1); y1 = 2*LB(1,2) - 1;
elseif k == 4
x1 = 2*LB(1,1); y1 = 2*LB(1,2);
end
if S(x1,y1) >= T
BS1 = [BS1 1 0];
Sig(x1,y1) = 1;
S(x1,y1) = S(x1,y1) - T;
elseif S(x1,y1) <= -T
BS1 = [BS1 1 1];
Sig(x1,y1) = 1;
S(x1,y1) = S(x1,y1) + T;
else
BS1 = [BS1 0];
end
end
if BL(LB(1,1),LB(1,2)) == 0
[flag,lb1] = descendant_map(LB(1,1),LB(1,2),S,T);
if max(BS1) == 1
BS = [BS 1 BS1];
bitcount = bitcount + 1 + numel(BS1);
BL(LB(1,1),LB(1,2)) = BL(LB(1,1),LB(1,2)) + 4;
if flag == 1
BS = [BS 1];
bitcount = bitcount + 1;
BL(LB(1,1),LB(1,2)) = BL(LB(1,1),LB(1,2)) + 1;
UB = [UB; LB(1,1),LB(1,2)];
if size(LB,1) == 1
LB = [];
else
LB = LB(2:end,1:end);
end;
LB = [lb1; LB];
else
BS = [BS 0];lb1 = [];
bitcount = bitcount + 1;
if size(LB,1) == 1
LB = [];
else
LB = LB(2:end,1:end);
end;
end
else
if flag == 0
BS = [BS 0];lb1 = [];
bitcount = bitcount + 1;
if size(LB,1) == 1
LB = [];
else
LB = LB(2:end,1:end);
end;
else
BS = [BS 1 0 0 0 0 1];
bitcount = bitcount + 6;
BL(LB(1,1),LB(1,2)) = 5;
UB = [UB; LB(1,1),LB(1,2)];
if size(LB,1) == 1
LB = [];
else
LB = LB(2:end,1:end);
end;
LB = [lb1; LB];
end
end
else % means == 3
if max(BS1) == 1
BS = [BS 1 BS1];
bitcount = bitcount + 1 + numel(BS1);
BL(LB(1,1),LB(1,2)) = BL(LB(1,1),LB(1,2)) + 4;
else
BS = [BS 0];
bitcount = bitcount + 1;
end
if size(LB,1) == 1
LB = [];
else
LB = LB(2:end,1:end);
end;
end
elseif BL(LB(1,1),LB(1,2)) == 4
[flag,lb1] = descendant_map(LB(1,1),LB(1,2),S,T);
if flag == 1
BS = [BS 1];
bitcount = bitcount + 1;
UB = [UB; LB(1,1),LB(1,2)];
BL(LB(1,1),LB(1,2)) = 5;
if size(LB,1) == 1
LB = [];
else
LB = LB(2:end,1:end);
end;
LB = [lb1; LB];
else
BS = [BS 0];lb1 = [];
bitcount = bitcount + 1;
if size(LB,1) == 1
LB = [];
else
LB = LB(2:end,1:end);
end;
end
elseif BL(LB(1,1),LB(1,2)) == 5
LB1 = [];
for i3 = 1:4
if i3 == 1
x1 = 2*LB(1,1)-1;y1 = 2*LB(1,2)-1;
elseif i3 == 2
x1 = 2*LB(1,1)-1;y1 = 2*LB(1,2);
elseif i3 == 3
x1 = 2*LB(1,1);y1 = 2*LB(1,2)-1;
else
x1 = 2*LB(1,1);y1 = 2*LB(1,2);
end
if BL(x1,y1) ~= 7
LB1 = [LB1;x1, y1];
end
end
UB = [UB; LB(1,1),LB(1,2)];
if size(LB,1) == 1
LB = [];
else
LB = LB(2:end,1:end);
end;
LB = [LB1;LB];
else % i.e. = 7
if size(LB,1) == 1
LB = [];
else
LB = LB(2:end,1:end);
end;
end
end
%%%%%%% Final updation of BL using UB %%%%%%%%%%%
while size(UB,1) ~= 0
n = size(UB,1);
% if size_UB < size(UB,1)
% size_UB = size(UB,1)
% end
xu = UB(n,1); yu = UB(n,2);
des = 1;
for i1 = 1:4
if i1 == 1
xx = 2*xu-1; yy = 2*yu-1;
elseif i1 == 2
xx = 2*xu-1; yy = 2*yu;
elseif i1 == 3
xx = 2*xu; yy = 2*yu-1;
else
xx = 2*xu; yy = 2*yu;
end
if BL(xx,yy) ~= 7
des = 0;
end
end
if des == 1
BL(xu,yu) = 7;
end
if n > 1
UB = UB(1:end-1,1:end);
else
UB = [];
if sub < 3
sub = sub + 1;
else
sub = 1;
if j < C/(2^(L+1))
j = j + 1;
else
j = 1;
i = i + 1;
end
end
end
end
end
%%%%%%%% Bitstream Stream Truncation %%%%%%%%%%%%
if bitcount < rate*size(S,1)*size(S,2) || T > 0.5
T = T/2;
I = 1;
else
I = 50;
end
last = find(BS,1,'last');
if numel(BS) == last
nz = numel(BS) - last;
BS = BS(1:last);
elseif numel(BS) == last + 1
nz = numel(BS) - last-1;
BS = BS(1:last+1);
else
nz = numel(BS) - last-2;
BS = BS(1:last+2);
end
Stream{iter} = BS;
iter = iter + 1;
bitcount = bitcount - nz;
BS = [];
else
break
end
end
if numel(BS) ~= 0
last = find(BS,1,'last');
if numel(BS) == last
nz = numel(BS) - last;
BS = BS(1:last);
elseif numel(BS) == last + 1
nz = numel(BS) - last-1;
BS = BS(1:last+1);
else
nz = numel(BS) - last-2;
BS = BS(1:last+2);
end
Stream{iter} = BS;
iter = iter + 1;
bitcount = bitcount - nz;
BS = [];
end