MATLAB: How to pass an image from a push button to function

guideimageparameterspushbutton

I have created two push buttons to browse images for the original and target images and these images are taken for the further process.
function pushbutton1_Callback(hObject, eventdata, handles)
[original pathname1] = uigetfile({'*.jpg';'*.bmp'},'File Selector');
   handles.originalImage = strcat(pathname1, original);
   guidata(hObject,handles);
% --- Executes on button press in pushbutton2.
function pushbutton2_Callback(hObject, eventdata, handles)
[target pathname2] = uigetfile({'*.jpg';'*.bmp'},'File Selector');
   handles.targetImage = strcat(pathname2, target);
   guidata(hObject,handles);
% --- Executes on button press in pushbutton3.
function pushbutton3_Callback(hObject, eventdata, handles)
   proceed=msgbox('operation completed');
   if isfield(handles,'originalImage')
     original=msgbox('original image uploaded successfully');
     im1=handles.originalImage
   end
   if isfield(handles,'targetImage')
     target=msgbox('target image uploaded successfully');
     im2=handles.targetImage 
   end
   Mosaic=ritfn(im1,im2);
Another function
function [Mosaic] = ritfn(im1,im2)
%UNTITLED Summary of this function goes here
%   Detailed explanation goes here
%Prepare Workspace
clear;clc;close all
%%Read Secret and Target images;
S=imread(im1);                            %Secret Image

T=imread(im2);                      %Target Image 
M=256;
N=192;
S=imresize(S,[M,N]);
T=imresize(T,[M,N]);
end
But the problem is
Reference to a cleared variable im1.
Error in ritfn (line 7)
S=imread(im1);                            %Secret Image
Error in rdhgui>pushbutton3_Callback (line 101)
   Mosaic=ritfn(im1,im2);
Error in gui_mainfcn (line 96)
          feval(varargin{:});
Error in rdhgui (line 42)
      gui_mainfcn(gui_State, varargin{:});
Error in
@(hObject,eventdata)rdhgui('pushbutton3_Callback',hObject,eventdata,guidata(hObject))
Error while evaluating uicontrol Callback

Best Answer

When you cleared all variables in ritfn with this:
clear;clc;close all
you blew away im1 and im2. Delete that line!
Another problem you will encounter: ritfn() never assigns the output variable Mosaic, but you expect it to return a variable by that name.
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