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Adjust.m
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%file: Adjust.m
%to adjust the MSB of pixel in adjustment area in order to keep the Thumbnail the same
%origin: the image after saving space and encipher progress
%(x,y): the start location of block
%value: store the average pixel in every block of the original image
%MSB: the number of every bit in adjustment area used for adjustment
function [AjImage,success] = Adjust(origin,blocksize,x,y,MSB,value)
%first: calculate the low (8-MSB) bit of all pixel --> sum
%store the all adjustment area location in locationx and locationy
AjImage = origin;
success = 1;
locationx = [];
locationy = [];
len = 1;
success=0;
locationx(len:len+blocksize-1) = x:x+blocksize-1;
locationy(len:len+blocksize-1) = y;
len = len+blocksize;
locationx(len:len+blocksize-1) = x:x+blocksize-1;
locationy(len:len+blocksize-1) = y+blocksize-1;
len = len+blocksize;
locationx(len:len+blocksize-3) = x;
locationy(len:len+blocksize-3) = y+1:y+blocksize-2;
len = len+blocksize-2;
locationx(len:len+blocksize-3) = x+blocksize-1;
locationy(len:len+blocksize-3) = y+1:y+blocksize-2;
len = len+blocksize-3;
sub = origin(x+1:x+blocksize-2,y+1:y+blocksize-2);
Sum = double(sum(sub(:)));
for i = 1 : len
t = Calcu(origin(locationx(i),locationy(i)),MSB);
Sum = Sum+double(t);
end
[~,limit] = size(locationx);
for i = 1 : limit
AjImage(locationx(i),locationy(i)) = Calcu(origin(locationx(i),locationy(i)),MSB);
end
diff = blocksize*blocksize*value - Sum;
if diff < 0
return ;
end
number = Generate(MSB);
[~,count] = size(number);
chan = zeros(1,count);
for i = 1 : count
res = floor(diff / number(i));
if res > limit
res = limit;
end
chan(i) = res;
diff = diff - res * number(i);
if diff < 0
break;
end
end
for j = 1 : count
for i = 1 : chan(j)
AjImage(locationx(i),locationy(i));
AjImage(locationx(i),locationy(i)) = AjImage(locationx(i),locationy(i)) + number(j);
AjImage(locationx(i),locationy(i));
end
end
sub = AjImage(x:x+blocksize-1,y:y+blocksize-1);
s = double(sum(sub(:)));
difference = abs(s-blocksize*blocksize*value);
end
% %second: calculate the difference between 'current' and blocksize*blocksize*value
% number = Generate(MSB);
% difference = blocksize*blocksize*value-Sum %generally the former must bigger than the later
%
% %third: search to find the perfect result
% if difference<number(1)
% for i = 1 :len
% AjImage(locationx(i),locationy(i)) = Calcu(origin(locationx(i),locationy(i)),MSB);
% end
% return;
% end
% [~,count] = size(number);
% num = zeros(1,count);%store the number of every value in number
% state = 0;
% if count == 1
% for p = 1 : len
% s = Sum+number(1)*p;
% difference = abs(s-blocksize*blocksize*value);
% if difference < number(1)/2
% num(1) = p;
% state = 1;
% break;
% end
% end
% if state == 0
% num(1) = 4*blocksize-4;
% s= Sum+number(1)*(4*blocksize-4);
% end
% for i = 1 : num(1)
% AjImage(locationx(i),locationy(i))=Calcu(origin(locationx(i),locationy(i)),MSB)+number(1);
% end
% for i = num(1)+1 : len
% AjImage(locationx(i),locationy(i))=Calcu(origin(locationx(i),locationy(i)),MSB);
% end
% elseif count == 3
% for p = len : -1 : 0
% for q = len-p : -1 : 0
% for r = len-p-q : -1 : 0
% s = Sum+number(1)*p+number(2)*q+number(3)*r;
% difference = abs(s-blocksize*blocksize*value);
% if difference < number(1)
% num(1) = p;
% num(2) = q;
% num(3) = r;
% state = 1;
% break;
% end
% end
% if state == 1
% break;
% end
% end
% if state == 1
% break;
% end
% end
% if state == 0
% num(1) = 0;
% num(2) = 0;
% num(3) = 4*blocksize-4;
% s = Sum+number(3)*(4*blocksize-4);
% end
% for i = 1 : num(1)
% AjImage(locationx(i),locationy(i)) = uint8(Calcu(origin(locationx(i),locationy(i)),MSB)+number(1));
% end
% for i = num(1)+1 : num(1)+num(2)
% AjImage(locationx(i),locationy(i)) = uint8(Calcu(origin(locationx(i),locationy(i)),MSB)+number(2));
% end
% for i = num(1)+num(2)+1 : num(1)+num(2)+num(3)
% AjImage(locationx(i),locationy(i)) = uint8(Calcu(origin(locationx(i),locationy(i)),MSB)+number(3));
% end
% for i = num(1)+num(2)+num(3)+1 : len
% AjImage(locationx(i),locationy(i)) = Calcu(origin(locationx(i),locationy(i)),MSB);
% end
% elseif count == 7
% for x = 0 : len
% for y = 0 : len-x
% for z = 0 : len-x-y
% for p = 0 : len-x-y-z
% for q = 0 : len-x-y-z-p
% for r = 0 : len-x-y-z-p-q
% for n = 0 : len-x-y-z-p-q-r
% s = Sum+number(1)*x+number(2)*y+number(3)*z+number(4)*p+number(5)*q+number(6)*r+number(7)*n;
% difference = abs(s-blocksize*blocksize*value);
% if difference < number(1)/2
% num(1) = x;
% num(2) = y;
% num(3) = z;
% num(4) = p;
% num(5) = q;
% num(6) = r;
% num(7) = n;
% state = 1;
% break;
% end
% end
% if state == 1
% break;
% end
% end
% if state == 1
% break;
% end
% end
% if state == 1
% break;
% end
% end
% if state == 1
% break;
% end
% end
% if state == 1
% break;
% end
% end
% if state == 1
% break;
% end
% end
% if state == 0
% num(1) = 0;
% num(2) = 0;
% num(3) = 0;
% num(4) = 0;
% num(5) = 0;
% num(6) = 0;
% num(7) = 4*blocksize-4;
% s = Sum+number(7)*(4*blocksize-4);
% end
% for i = 1 : num(1)
% AjImage(locationx(i),locationy(i))=Calcu(origin(locationx(i),locationy(i)),MSB)+number(1);
% end
% for i = num(1)+1 : num(2)
% AjImage(locationx(i),locationy(i))=Calcu(origin(locationx(i),locationy(i)),MSB)+number(2);
% end
% for i = num(1)+num(2)+1 : num(1)+num(2)+num(3)
% AjImage(locationx(i),locationy(i))=Calcu(origin(locationx(i),locationy(i)),MSB)+number(3);
% end
% for i = num(1)+num(2)+num(3)+1 : num(1)+num(2)+num(3)+num(4)
% AjImage(locationx(i),locationy(i))=Calcu(origin(locationx(i),locationy(i)),MSB)+number(4);
% end
% for i = num(1)+num(2)+num(3)+num(4)+1 : num(1)+num(2)+num(3)+num(4)+num(5)
% AjImage(locationx(i),locationy(i))=Calcu(origin(locationx(i),locationy(i)),MSB)+number(5);
% end
% for i = num(1)+num(2)+num(3)+num(4)+num(5)+1 : num(1)+num(2)+num(3)+num(4)+num(5)+num(6)
% AjImage(locationx(i),locationy(i))=Calcu(origin(locationx(i),locationy(i)),MSB)+number(6);
% end
% for i = num(1)+num(2)+num(3)+num(4)+num(5)+num(6)+1 : num(1)+num(2)+num(3)+num(4)+num(5)+num(6)+num(7)
% AjImage(locationx(i),locationy(i))=Calcu(origin(locationx(i),locationy(i)),MSB)+number(7);
% end
% for i = num(1)+num(2)+num(3)+num(4)+num(5)+num(6)+num(7)+1 : len
% AjImage(locationx(i),locationy(i))=Calcu(origin(locationx(i),locationy(i)),MSB);
% end
% end
% difference = abs(s-blocksize*blocksize*value)
% if difference<blocksize*blocksize*5
% success = 1;
% end