how to call pic1 and pic2 in pushbutton3_callbacks

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I have load pic1 in pushbutton 1 and load pic2 in pushbutton 2. I want to compare these two picture in pushbutton3_callbacks. How to call pic1 and pic2 in pushbotton3_callback.

 % --- Executes on button press in pushbutton1.
  function pushbutton1_Callback(hObject, eventdata, handles)
  %global pic1
  [filename pathname] = uigetfile ({'*.tif';'*.bmp'},'File Selector');
  pic1= strcat (pathname,filename);
  axes(handles.axes1)
  imshow(pic1)
% --- Executes on button press in pushbutton2.
function pushbutton2_Callback(hObject, eventdata, handles)
global pic2
[filename pathname] = uigetfile ({'*.tif';'*.bmp'},'File Selector');
pic2= strcat (pathname,filename);
axes(handles.axes2)
imshow(pic2)
% --- Executes on button press in pushbutton3.
function pushbutton3_Callback(hObject, eventdata, handles)
%so that we obtain white and black points and edges of the objects present
%in the picture.
edge_det_pic1 = edge(image1,'prewitt');
%applying edge detection on first picture
%so that we obtain white and black points and edges of the objects present
%in the picture.
edge_det_pic2 = edge(image2,'prewitt');
%initialization of different variables used
matched_data = 0;
white_points = 0;
black_points = 0;
x=0;
y=0;
l=0;
m=0;
%for loop used for detecting black and white points in the picture.
for a = 1:1:256
    for b = 1:1:256
        if(edge_det_pic1(a,b)==1)
            white_points = white_points+1;
        else
            black_points = black_points+1;
        end
    end
end
%for loop comparing the white (edge points) in the two pictures
for i = 1:1:256
    for j = 1:1:256
        if(edge_det_pic1(i,j)==1)&&(edge_det_pic2(i,j)==1)
            matched_data = matched_data+1;
            else
                ;
        end
    end
end
   %calculating percentage matching.
total_data = white_points;
total_matched_percentage = (matched_data/total_data)*100;
%outputting the result of the system.
if(total_matched_percentage >= 17)   
      %can add flexability at this point by reducing the amount of matching.
   total_matched_percentage
    msgbox('The Fingerprint is MATCHING');
else
    total_matched_percentage
  msgbox('The Fingerprint is NOT MATCHING');
end