How to save an image from GUI ?

How to save an image which is generated in GUI and use it further in the same code ? I want to calculate MSE and PSNR values for an image which is generated in GUI but stuck in code that how to save it and use it further. Please help.

[Adam]

What do you mean by 'generated in GUI'? You must have code somewhere that generates the data.

https://uk.mathworks.com/help/matlab/creating_guis/share-data-among-callbacks.html

should then help in terms of sharing that data to different callbacks where you may wish to use it.

[Gayatri B]

Hi, following is my code of my project and want to save the image which is generated in data hiding and want to use further. Can you help me in this ?

function varargout = Image_steganography(varargin)

% IMAGE_STEGANOGRAPHY MATLAB code for Image_steganography.fig

% IMAGE_STEGANOGRAPHY, by itself, creates a new IMAGE_STEGANOGRAPHY or raises the existing

% singleton*.

%

% H = IMAGE_STEGANOGRAPHY returns the handle to a new IMAGE_STEGANOGRAPHY or the handle to

% the existing singleton*.

%

% IMAGE_STEGANOGRAPHY('CALLBACK',hObject,eventData,handles,...) calls the local

% function named CALLBACK in IMAGE_STEGANOGRAPHY.M with the given input arguments.

%

% IMAGE_STEGANOGRAPHY('Property','Value',...) creates a new IMAGE_STEGANOGRAPHY or raises the

% existing singleton*. Starting from the left, property value pairs are

% applied to the GUI before Image_steganography_OpeningFcn gets called. An

% unrecognized property name or invalid value makes property application

% stop. All inputs are passed to Image_steganography_OpeningFcn via varargin.

%

% *See GUI Options on GUIDE's Tools menu. Choose "GUI allows only one

% instance to run (singleton)".

%

% See also: GUIDE, GUIDATA, GUIHANDLES

% Edit the above text to modify the response to help Image_steganography

% Last Modified by GUIDE v2.5 22-Dec-2018 11:44:09

% Begin initialization code - DO NOT EDIT

gui_Singleton = 1;

gui_State = struct('gui_Name', mfilename, ...

'gui_Singleton', gui_Singleton, ...

'gui_OpeningFcn', @Image_steganography_OpeningFcn, ...

'gui_OutputFcn', @Image_steganography_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

% End initialization code - DO NOT EDIT

% --- Executes just before Image_steganography is made visible.

function Image_steganography_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 Image_steganography (see VARARGIN)

% Choose default command line output for Image_steganography

handles.output = hObject;

% Update handles structure

guidata(hObject, handles);

% UIWAIT makes Image_steganography wait for user response (see UIRESUME)

% uiwait(handles.figure1);

% --- Outputs from this function are returned to the command line.

function varargout = Image_steganography_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 Retrive.

function Retrive_Callback(hObject, eventdata, handles)

% hObject handle to Retrive (see GCBO)

% eventdata reserved - to be defined in a future version of MATLAB

% handles structure with handles and user data (see GUIDATA)

global l;

h=mod(l,2);

p=zeros(1000,1000);

for x=1:1000

for y=1:1000

if(h(x,y)==1)

p(x,y)=255;

end

end

end

s=im2bw(p);

axes(handles.axes4);

imshow(s);

grid on;

% --- Executes on button press in input_image.

function Cover_image_Callback(hObject, eventdata, handles)

% hObject handle to input_image (see GCBO)

% eventdata reserved - to be defined in a future version of MATLAB

% handles structure with handles and user data (see GUIDATA)

global k;

i=imread('b.jpg');

j=imresize(i,[1000, 1000]); % resizing taken image

k=rgb2gray(j); % converting rgb image to gray image

%subplot(1,2,1)

axes(handles.axes1);

imshow(k);

grid on;

% --- Executes on button press in Cover_image.

function input_image_Callback(hObject, eventdata, handles)

% hObject handle to Cover_image (see GCBO)

% eventdata reserved - to be defined in a future version of MATLAB

% handles structure with handles and user data (see GUIDATA)

global z;

x=imread('colorlable.jpg'); % image to be hidden

y=imresize(x,[1000, 1000]); % resizing hidden image

z=im2bw(y); % converting rbg to binary

%subplot(1,2,2);

axes(handles.axes2);

imshow(z) % displaying image to be hidden

grid on;

% --- Executes on button press in Data_Hiding.

function Data_Hiding_Callback(hObject, eventdata, handles)

% hObject handle to Data_Hiding (see GCBO)

% eventdata reserved - to be defined in a future version of MATLAB

% handles structure with handles and user data (see GUIDATA)

global z;

global k;

global l;

z=double(z); % increasing range to double

r=double(k-mod(k,2)); % removal of LSB bits

l=uint8(r+z); % adding LSB bit from image to be hidden

axes(handles.axes3);

imshow(l)

grid on;

a=imread('colorlable.jpg');

[m,n,d]=size(a);

kmax=floor((m*n)/(m+n+1));

da=double(a);

U=zeros(m,m);S=zeros(m,n);V=zeros(n,n);e=zeros(kmax,d);cr=zeros(kmax,1);rmse=zeros(kmax,d);

for i=1:d

[U(:,:,i),S(:,:,i),V(:,:,i)]=svd(da(:,:,i));

end

for k=1:kmax

ca=zeros(m,n,d);

MSE=m*n/(k*(m+n+1));

fprintf('MSE value at %f.\n',MSE);

SNR =(10*log10((sum(m.^2)))/MSE);

fprintf('PSNR value at %4f.\n',SNR);

end

a=imread('a.jpg');

[m,n,d]=size(a);

kmax=floor((m*n)/(m+n+1));

da=double(a);

U=zeros(m,m);S=zeros(m,n);V=zeros(n,n);e=zeros(kmax,d);cr=zeros(kmax,1);rmse=zeros(kmax,d);

for i=1:d

[U(:,:,i),S(:,:,i),V(:,:,i)]=svd(da(:,:,i));

end

for k=1:kmax

ca=zeros(m,n,d);

cr(k)=m*n/(k*(m+n+1));

fprintf('MSE1 value at %f.\n',cr(k));

SNR =(10*log10((sum(m.^2)))/cr(k));

fprintf('PSNR1 value at %4f.\n',SNR);

end