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dct_test.m
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dct_test.m
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%% 弱いストラクチャ部分を検出し、強いストラクチャからの深度情報を反映させるプログラム
% inspired paper:"Blind Photograph Watermarking with Robust Defocus-Based JND Model"
% https://www.hindawi.com/journals/wcmc/2020/8892349/
clear;
clc;
img = imread('./img/encode01.png');
img = imresize(img, [960 1280]);
%img = imresize(img, [480 640]);
img = im2double(im2gray(img));
T = dctmtx(8);
dct = @(block_struct) T * block_struct.data * T';
B = blockproc(img,[8 8],dct);
mask = [
1 1 1 0 0 0 0 0
1 1 0 0 0 0 0 0
1 0 1 0 0 0 0 0
0 0 0 0 0 0 0 0
0 0 0 0 0 0 0 0
0 0 0 0 0 0 0 0
0 0 0 0 0 0 0 0
0 0 0 0 0 0 0 0
];
B2 = blockproc(B,[8 8],@(block_struct) mask .* block_struct.data);
ETM = []; % Matrix of ET
ELM = []; % Matrix of EL
EMM = []; % Matrix of EM
for xx=1:8:size(B2,2)
for yy=1:8:size(B2,1)
A = B2(yy:yy+7,xx:xx+7);
ETM(yy:yy+7,xx:xx+7) = 0.0;
if A(1,1) > 0
ET = A(2,1)^2 + A(3,1)^2 + ...
A(1,2)^2 + A(1,3)^2 + ...
A(2,2)^2 + A(3,3)^2;
ET = ET / A(1,1)^2;
ETM(yy:yy+7,xx:xx+7) = ET;
end
EL = max([A(1,2) A(2,1) A(2,2)]);
EM = max([A(1,3) A(3,1) A(3,3)]);
ELM(yy:yy+7,xx:xx+7) = EL;
EMM(yy:yy+7,xx:xx+7) = EM;
end
end
%% ETが0.02よりも大きい場合、強いテクスチャブロック
% Strongly textured block
STB = (ETM > 0.02);
% Weakly textured block
WTB = (ETM <= 0.02);
% Cに関しては詳細が不明なもののpoolingと言っているので
% 特定ブロックに区切った際の最大・平均・ストライドの
% いずれかを指しているものと思われる
%C = mean(ETM,'all');
C = max(ETM,[],'all');
%C = medfilt2(ETM,[5 5]);
C0 = 16;
ELM_copy = ELM;
EMM_copy = EMM;
%% パラメータを変えてループ
% restore ELM and EMM
ELM = ELM_copy;
EMM = EMM_copy;
%% Calc DM on STB
S_ELM = ELM;
S_EMM = EMM;
S_ELM(~STB) = 0;
S_EMM(~STB) = 0;
%S_ELM = (S_ELM < (C0 .* C.^0.40)) .* S_ELM;
%S_EMM = (S_EMM < (C0 .* C.^0.25)) .* S_EMM;
EE = (S_ELM + S_EMM) ; % Equation (14)
EE = S_ELM;
%% Calc DM on WTB
ELM(~WTB) = 0;
EMM(~WTB) = 0;
% Equation(15)
S = (log10(abs(ELM)) - log10(abs(EMM))) / ((log10(0.85)-log10(1.))); % TODO: fix S
%S = (abs(S) > 1) .* S .* 1.4 + (abs(S) <= 1) .* S .* 0;
% % ↓弱いストラクチャの認識
%S(abs(S) < 10) = 0;
% 合成
%DM = (EE > 0) .* EE + (EE <= 0).* S;
DM = S;
% Osafune Blur
DMAP = f_blur(DM,10,1); % if size(image) <= (480,640), n = 8 or less.
DMAP = log10(abs(DMAP));
%DMAP(DMAP < 1.05) = 0;
% 表示
figure(1);
cl = [0.5 4]; % clim
tiledlayout(1,2)
nexttile
imagesc(EE);colormap(jet);clim(cl);colorbar;title('sparse by DCT');
nexttile
imagesc(DMAP);colormap(jet);clim(cl);colorbar;title('dense by DCT');
drawnow;
%DM = get_dfm(img,DM,5);
%figure(1);imagesc(SX);colorbar;
%figure(2);imagesc(S);clim([0 2.5]);colorbar;
%figure(3);imagesc(DMX);colorbar;
% invdct = @(block_struct) T' * block_struct.data * T;
% K = blockproc(B2,[8 8],invdct);
%figure(3);colormap('jet');imagesc(K);colorbar;clim([0 .5])
% dct = @(block_struct) T * block_struct.data * T';
% B = blockproc(img,[8 8],dct);
% B2 = blockproc(B,[8 8],@(block_struct) mask .* block_struct.data);
% invdct = @(block_struct) T' * block_struct.data * T;
% K = blockproc(B2,[8 8],invdct);
%
% im = ind2rgb(255-(im2uint8(img) - im2uint8(K)));
% figure(3);imshow(im);
% drawnow