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DCT_test.m
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DCT_test.m
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IMG=imread('./BMP/5.bmp');
% IMG = imread('cameraman.tif');
% IMG = rgb2gray(IMG);
IMGS=IMG;
IMG2=IMG;
IMGS2=IMG;
[height, width, cols]=size(IMG);
bitn=1;
line = 2;
% line = round(height/2);
lfirst = 1;
llast = height;
percent=90;
mul=8;
bits=5;
nco=64;
% color=1;
%
% color=2;
% IMGS=writeStegoRnd(IMGS,percent,lfirst,llast,bitn,color);
% color=3;
% IMGS=writeStegoRnd(IMGS,percent,lfirst,llast,bitn,color);
T = dctmtx(8);
mdct = @(x)T * x * T';
invmdct = @(x)T' * x * T;
% dct = @dct2;
% invdct = @idct2;
mask = [1 1 1 1 1 1 1 1
1 0 0 0 0 0 0 0
1 0 0 0 0 0 0 0
1 0 0 0 0 0 0 0
1 0 0 0 0 0 0 0
1 0 0 0 0 0 0 0
1 0 0 0 0 0 0 0
1 0 0 0 0 0 0 0];
posM = [1 2 6 7 15 16 28 29
3 5 8 14 17 27 30 43
4 9 13 18 26 31 42 44
10 12 19 25 32 41 45 54
11 20 24 33 40 46 53 55
21 23 34 39 47 52 56 61
22 35 38 48 51 57 60 62
36 37 49 50 58 59 63 64];
COEF1 = zeros(64, uint16(height*width/64),cols);
% IMGY=IMG.*mul;
IMGY=bitshift(IMG,bits);
% IMGY=rgb2ycbcr(IMGY);
for i=1:cols
I=IMGY(:,:,i);
I=bitget(I,1);
% I = im2double(I);
I=double(I);
B = blkproc(I,[8 8],mdct);
for j=1:64
COEF1(j,:,i)=GetDCTCoefficientsVec(B,j);
end
% icor=1
% for j=1:8:height-8)
% for k=1:8:width-16
% sB1=B(j:j+7,k:k+7);
% sB2=B(j:j+7,k+9:k+15);
% corrs(icor)=xcorr2
% end
% end
B2 = blkproc(B,[8 8],@(x)mask.* x);
% I2 = blkproc(B2,[8 8],invdct);
I2 = blkproc(B,[8 8],invmdct);
IMG2(:,:,i) = im2uint8(I2);
end
bitstd=nlfilter(double(COEF1(nco,:,1)),[1 20],@std);
x=1:length(bitstd);
cdct=dct(bitstd);
i=length(cdct);
stdmdct=blkproc(double(cdct(2:i)),[1 10],@std);
y=1:length(stdmdct);
% meanstdmdc=blkproc(stdmdct,[1 10],@mean);
% z=1:length(meanstdmdc);
% IMG2=ycbcr2rgb(IMG2);
% imshow(IMG), figure, imshow(IMG2)
% figure
% hist(B), colorbar
% Встраивание сообщения
COEF2 = zeros(64, uint16(height*width/64),cols);
% Stego
% IMG=writeStegoRnd(IMG,percent,1,width-1,1);
message=genRndMessage(uint32(height*width*cols/8));
IMGS=writeStego(IMG,message);
% IMGY=IMGS.*mul;
IMGSY=bitshift(IMGS,bits);
% IMGSY=rgb2ycbcr(IMGSY);
for i=1:cols
%IMGS=writeStegoRnd(IMG,percent,lfirst,llast,bitn,i);
I=IMGSY(:,:,i);
I=bitget(I,1);
% I = im2double(I);
I=double(I);
B = blkproc(I,[8 8],mdct);
for j=1:64
COEF2(j,:,i)=GetDCTCoefficientsVec(B,j);
end
% icor=1
% for j=1:8:height-8)
% for k=1:8:width-16
% sB1=B(j:j+7,k:k+7);
% sB2=B(j:j+7,k+9:k+15);
% corrs(icor)=xcorr2
% end
% end
B2 = blkproc(B,[8 8],@(x)mask.* x);
% I2 = blkproc(B2,[8 8],invdct);
I2 = blkproc(B,[8 8],invmdct);
IMGS2(:,:,i) = im2uint8(I2);
end
bitstd2=nlfilter(double(COEF2(nco,:,1)),[1 20],@std);
x2=1:length(bitstd2);
cdct2=dct(bitstd2);
i=length(cdct2);
stdmdct2=blkproc(double(cdct2(2:i)),[1 10],@std);
y2=1:length(stdmdct2);
% meanstdmdc2=blkproc(stdmdct2,[1 10],@mean);
% z=1:length(meanstdmdc);
figure, plot(x,bitstd,'r',x2,bitstd2,'g');
figure, plot(x,cdct,'r',x2,cdct2,'g');
figure, plot(y,stdmdct,'r',y2,stdmdct2,'g');
% figure, plot(z,meanstdmdc,'r',z2,meanstdmdc2,'g');
% IMG2=ycbcr2rgb(IMGS2);
% figure, imshow(IMGS2)
% YCBCR=rgb2ycbcr(IMGS2);
% figure, imshow(IMG2(:,:,1))
% figure, imshow(IMG2(:,:,2))
% figure, imshow(IMG2(:,:,3))
% figure, imshow(YCBCR(:,:,1))
% figure, imshow(YCBCR(:,:,2))
% figure, imshow(YCBCR(:,:,3))