imgsteg.rar

function varargout = imgsteg(varargin) gui_Singleton = 1; gui_State = struct('gui_Name', mfilename, ... 'gui_Singleton', gui_Singleton, ... 'gui_OpeningFcn', @imgsteg_OpeningFcn, ... 'gui_OutputFcn', @imgsteg_OutputFcn, ... 'gui_LayoutFcn', [] , ... 'gui_Callback', []); if nargin && ischar(varargin{1}) gui_State.gui_Callback = str2func(varargin{1}); end if nargout [varargout{1:nargout}] = gui_mainfcn(gui_State, varargin{:}); else gui_mainfcn(gui_State, varargin{:}); end function imgsteg_OpeningFcn(hObject, eventdata, handles, varargin) % This function has no output args, see OutputFcn. % hObject handle to figure % eventdata reserved - to be defined in a future version of MATLAB % handles structure with handles and user data (see GUIDATA) % varargin command line arguments to imgsteg (see VARARGIN) % Choose default command line output for imgsteg handles.output = hObject; handles.rad1=1; handles.rad2=0; handles.cfilename=' '; handles.cpathname=' '; handles.sfilename=' '; handles.spathname=' '; handles.equ=0; set(handles.pushbutton2,'Enable','off'); set(handles.pushbutton3,'Enable','off'); axes(handles.axes1); axis off axes(handles.axes2); axis off % Update handles structure guidata(hObject, handles); % UIWAIT makes imgsteg wait for user response (see UIRESUME) % uiwait(handles.figure1); % --- Outputs from this function are returned to the command line. function varargout = imgsteg_OutputFcn(hObject, eventdata, handles) % varargout cell array for returning output args (see VARARGOUT); % hObject handle to figure % eventdata reserved - to be defined in a future version of MATLAB % handles structure with handles and user data (see GUIDATA) % Get default command line output from handles structure varargout{1} = handles.output; % --- Executes on button press in pushbutton1. function pushbutton1_Callback(hObject, eventdata, handles) % hObject handle to pushbutton1 (see GCBO) % eventdata reserved - to be defined in a future version of MATLAB % handles structure with handles and user data (see GUIDATA) lsb=1; [handles.cfilename,handles.cpathname] = uigetfile( {'*.jpg';'*.png';'*.bmp';'*.*'}, ... 'Select cover image'); axes(handles.axes1); I=imread([handles.cpathname handles.cfilename]); imageinfo_cover=imfinfo([handles.cpathname handles.cfilename]); val_red=I(:,:,1); if handles.rad2==1 emb=zeros(3,7); emb(1,:)=bitget(val_red(1,50:56),lsb); emb(2,:)=bitget(val_red(1,57:63),lsb); emb(3,:)=bitget(val_red(1,64:70),lsb); emb_double=bi2de(emb); emb=char(emb_double); emb=emb'; if ~strcmp(emb,'yes') axes(handles.axes1);cla errordlg(['No hidden image in ' handles.cfilename],'Select another Image'); else image(I),axis off set(handles.pushbutton3,'Enable','on'); end else image(I),axis off image_height=imageinfo_cover.Height; image_width=imageinfo_cover.Width; handles.equ=((image_height-1)*(image_width-mod(image_width,8)))/8; set(handles.pushbutton2,'Enable','on'); end guidata(hObject, handles); % --- Executes on button press in pushbutton2. function pushbutton2_Callback(hObject, eventdata, handles) % hObject handle to pushbutton2 (see GCBO) % eventdata reserved - to be defined in a future version of MATLAB % handles structure with handles and user data (see GUIDATA) if handles.rad2==1 else [handles.sfilename handles.spathname]=uigetfile({'*.jpg';'*.png'},'Select an Image'); imageinfo_cover=imfinfo([handles.spathname handles.sfilename]); image_height=imageinfo_cover.Height; image_width=imageinfo_cover.Width; equ=image_width*image_height; if equ <=handles.equ I=imread([handles.spathname handles.sfilename]); set(handles.pushbutton3,'Enable','on'); axes(handles.axes2); image(I);axis off else errordlg('Select another Image','Image too big'); end guidata(hObject, handles); end % --- Executes on button press in pushbutton3. function pushbutton3_Callback(hObject, eventdata, handles) % hObject handle to pushbutton3 (see GCBO) % eventdata reserved - to be defined in a future version of MATLAB % handles structure with handles and user data (see GUIDATA) if handles.rad1==1 lsb=1; I=imread([handles.cpathname handles.cfilename]); imageinfo_cover=imfinfo([handles.cpathname handles.cfilename]); image_height=imageinfo_cover.Height; image_width=imageinfo_cover.Width; val_red=I(:,:,1); %get the red color matrix I_sec=imread([handles.spathname handles.sfilename]); imageinfo_sec=imfinfo([handles.spathname handles.sfilename]); %get information of secret image i_sec_height=imageinfo_sec.Height; % secret image height i_sec_width=imageinfo_sec.Width; % secret image width val_red=double(val_red); %hide the secret image height i_sec_height_bin=de2bi(i_sec_height,16); val_red(1,1:16)=bitset(val_red(1,1:16),1,i_sec_height_bin); %hide the secret image width i_sec_width_bin=de2bi(i_sec_width,16); val_red(1,17:32)=bitset(val_red(1,17:32),1,i_sec_width_bin); %hide an identity, that this image has a secret image. emb=('yes'); emb_bin=de2bi(double(emb)); val_red(1,50:56)=bitset(val_red(1,50:56),lsb,emb_bin(1,1:7)); val_red(1,57:63)=bitset(val_red(1,57:63),lsb,emb_bin(2,1:7)); val_red(1,64:70)=bitset(val_red(1,64:70),lsb,emb_bin(3,1:7)); I(:,:,1)=val_red; i_sec_length=i_sec_height*i_sec_width; I_sec_bin=zeros(i_sec_length*3,8); I_sec_bin=de2bi(double(I_sec)); %convert the secret image to binary Ipix_counter=1; %set a counter for the pixels len=mod(image_width,8); len=image_width-len; for count_hi=2:image_height count_wi=1; for count_wi=1:8:len-8 val_red(count_hi,count_wi:count_wi+7)=bitset(val_red(count_hi,count_wi:count_wi+7),1,I_sec_bin(Ipix_counter,:)); Ipix_counter=Ipix_counter+1; if Ipix_counter>i_sec_length*3 break; end end if Ipix_counter>i_sec_length*3 break; end end I(:,:,1)=val_red; [filename, pathname] = uiputfile('.png', 'Save Image as'); imwrite(I,[pathname filename ],'png'); set(handles.pushbutton3,'Enable','off'); set(handles.pushbutton2,'Enable','off'); axes(handles.axes1);cla axes(handles.axes2);cla msgbox(['The secret image ' handles.sfilename ' is in ' filename]); else %case 2:Dercyption(Reocver the secret image from cover image) lsb=1; I=imread([handles.cpathname handles.cfilename]); imageinfo_cover=imfinfo([handles.cpathname handles.cfilename]);%cover image information image_height=imageinfo_cover.Height; %cover image height image_width=imageinfo_cover.Width; %cover image width val_red=I(:,:,1); %get the red color matrix %extract the secret image height and width from 1st 32pixel of cover image i_sec_height=bi2de(bitget(double(val_red(1,1:16)),1)); i_sec_width=bi2de(bitget(double(val_red(1,17:32)),1)); i_sec_length=i_sec_height*i_sec_width; I_sec_bi=zeros(i_sec_length*3,8);%initialize a zero matrix Ipix_counter=1; %counter for pixels len=mod(image_width,8); len=image_width-len; for count_hi=2:image_height count_wi=1; for count_wi=1:8:len-8 I_sec_bi(Ipix_counter,1:8)=... bitget(val_red(count_hi,count_wi:count_wi+7),1); Ipix_counter=Ipix_counter+1; if Ipix_counter>i_sec_length*3 break; end end if Ipix_counter>i_sec_length*3 break; end end image1=reshape(bi2de(I_sec_bi),i_sec_height,i_sec_width,3); image1=uint8(image1); rn=num2str(rand(1,1)); imwrite(image1,[nu