GUI 变量传递 handles

function uipushtool1_ClickedCallback(hObject,eventdata,handles)    %open the image file

filename = uigetfile('*.jpg', 'Select an image file');

im = imread(filename);

imagesc(im);

handles.im = im;        %define im in handles

%Update 

guidata(hObject, handles);

function pushbutton1_Callback(hObject, eventdata, handles)   %call the function

im = handles.im;      %get im from handles

findBallFunction（im）；