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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,37 @@ | ||
| function main | ||
| %Image | ||
| image=double(rgb2gray(imread('Kodak/kodim01.png'))); | ||
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| %Payload | ||
| payload_length=25000; %number of bits to be embedded | ||
| payload=randi([0,1],payload_length,1); | ||
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| %Embedding | ||
| [rdh_image, ~, ~, ~,embedding_capacity_left]=mbp(image,payload); | ||
| if embedding_capacity_left < 0 | ||
| disp('Failed embedding') | ||
| else | ||
| disp(['Can embed ' num2str(embedding_capacity_left) ' bits more (estimated)']) | ||
| end | ||
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| %Recovery check | ||
| [payload_rec, re_image] = mbp_recovery(rdh_image); | ||
| if isequal(re_image,image) | ||
| disp('Original image recovered') | ||
| else | ||
| disp('Failed to recover the original image') | ||
| end | ||
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| if isequal(payload_rec,payload) | ||
| disp('Payload recovered') | ||
| else | ||
| disp('Failed to recover the payload') | ||
| end | ||
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| %show the image | ||
| close all | ||
| figure(1) | ||
| imshow(uint8(image)) | ||
| figure(2) | ||
| imshow(uint8(rdh_image)) | ||
| end |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,92 @@ | ||
| function [payload_rec, re_image]=mbp_recovery(rdh_image) | ||
| tic | ||
| image_size = size(rdh_image); | ||
| image_hor = reshape(rdh_image,image_size(1)*image_size(2),1); | ||
| % ref_image_hor(:,1) = reshape(rdh_image,image_size(1)*image_size(2),1); | ||
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| % Reverse Operation | ||
| first_16_pixels_rec=bitxor(image_hor(1:16),mod(image_hor(1:16),2)); | ||
| P_s_rec=bi2de(mod(image_hor(1:8)',2)); | ||
| P_c_rec=bi2de(mod(image_hor(9:16)',2)); | ||
| % disp("P_s") | ||
| % isequal(P_s,P_s_rec) | ||
| % disp("P_c") | ||
| % isequal(P_c,P_c_rec) | ||
| if P_s_rec < P_c_rec %RHS | ||
| d = 1; | ||
| else %LHS | ||
| d = -1; | ||
| end | ||
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| %Undo first iteration | ||
| image_hor=image_hor(17:end); | ||
| %Extract Payload + side information | ||
| message_rec=(image_hor(image_hor==P_s_rec |image_hor==P_s_rec+d)==P_s_rec+d); | ||
| LM_size=sum(image_hor==P_c_rec); | ||
| LM_rec=message_rec(1:LM_size); | ||
| % disp("LM") | ||
| % isequal(LM,LM_rec) | ||
| P_s_p_rec=bi2de(message_rec(1+LM_size:8+LM_size)'); | ||
| P_c_p_rec=bi2de(message_rec(9+LM_size:16+LM_size)'); | ||
| first_16_pixels_rec=bitxor(first_16_pixels_rec,message_rec(17+LM_size:32+LM_size)); | ||
| payload_rec=message_rec(33+LM_size:end); | ||
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| %Shift back | ||
| if d == 1 | ||
| image_hor(image_hor > P_s_rec & image_hor < P_c_rec)=image_hor(image_hor > P_s_rec & image_hor < P_c_rec)-d; %RHS | ||
| else | ||
| image_hor(image_hor < P_s_rec & image_hor > P_c_rec)=image_hor(image_hor < P_s_rec & image_hor > P_c_rec)-d; %LHS | ||
| end | ||
| %Undo location map | ||
| image_hor(image_hor==P_c_rec)=image_hor(image_hor==P_c_rec)-d*LM_rec; | ||
| image_hor=[first_16_pixels_rec; image_hor]; | ||
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| % disp("image_hor") | ||
| % isequal(image_hor,ref_image_hor(:,iteration)) | ||
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| %Undo rest of the iteration | ||
| P_s_rec=P_s_p_rec; | ||
| P_c_rec=P_c_p_rec; | ||
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| % disp("P_s") | ||
| % isequal(P_s_rec,P_s_list(iteration+1)) | ||
| % disp("P_c") | ||
| % isequal(P_c_rec,P_c_list(iteration+1)) | ||
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| while (P_s_rec ~= 0 || P_c_rec ~= 0) | ||
| if P_s_rec < P_c_rec %RHS | ||
| d = 1; | ||
| else %LHS | ||
| d = -1; | ||
| end | ||
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| %Extract Payload + side information | ||
| message_rec=(image_hor(image_hor==P_s_rec |image_hor==P_s_rec+d)==P_s_rec+d); | ||
| LM_size=sum(image_hor==P_c_rec); | ||
| LM_rec=message_rec(1:LM_size); | ||
| P_s_p_rec=bi2de(message_rec(1+LM_size:8+LM_size)'); | ||
| P_c_p_rec=bi2de(message_rec(9+LM_size:16+LM_size)'); | ||
| payload_rec=[ message_rec(17+LM_size:end); payload_rec]; | ||
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| %Shift back | ||
| if d == 1 | ||
| image_hor(image_hor > P_s_rec & image_hor < P_c_rec)=image_hor(image_hor > P_s_rec & image_hor < P_c_rec)-d; %RHS | ||
| else | ||
| image_hor(image_hor < P_s_rec & image_hor > P_c_rec)=image_hor(image_hor < P_s_rec & image_hor > P_c_rec)-d; %LHS | ||
| end | ||
| %Undo location map | ||
| image_hor(image_hor==P_c_rec)=image_hor(image_hor==P_c_rec)-d*LM_rec; | ||
| P_s_rec=P_s_p_rec; | ||
| P_c_rec=P_c_p_rec; | ||
| % disp("image_hor") | ||
| % isequal(image_hor,ref_image_hor(:,iteration+1)) | ||
| % [P_s_rec P_c_rec] | ||
| end | ||
| re_image=reshape(image_hor,image_size(1),image_size(2)); | ||
| payload_length_max=2*ceil(log2(image_size(1)*image_size(2)+1)); | ||
| payload_length=bi2de(payload_rec(1:payload_length_max)'); | ||
| payload_rec(1:payload_length_max)=[]; | ||
| payload_rec(payload_length+1:end)=[]; | ||
| toc | ||
| end | ||
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