求助，怎样用gui显示一个图像？能解释一下这段程序么？谢谢

set(hObject, 'Units', 'pixels');
handles.banner = imread([matlabroot filesep 'demos' filesep
'banner.jpg']); % Read the image file banner.jpg
info = imfinfo([matlabroot filesep 'demos' filesep
'banner.jpg']); % Determine the size of the image file
position = get(hObject, 'Position');
set(hObject, 'Position', [position(1:2) info.Width + 100
info.Height + 100]);
axes(handles.axes1);
image(handles.banner)
set(handles.axes1, ...
'Visible', 'off', ...
'Units', 'pixels', ...
'Position', [50 50 info.Width info.Height]);
在具体执行的时候应该怎么用呢？能给一个真实的例子么？