1) You probably should not have any occurrences of
handles.output = hObject;
and certainly not one for every createFcn or callback.
2) You have
complete = strcat(pn,fn);
You should learn to use fullfile()
3) You have
set(handles.axes1,'string',complete);
handles.axes1 appears to be an axes. axes have no 'string' property. This line would have caused your callback to fail, causing it to not display the image.
4) you have
imshow(I,[]);
That is not necessarily going to display to the axes you want. You should use
imshow(I, [], 'Parent', handles.axes1);
5) In function get_ready you have
global k
You do not assign to k or use k anywhere in any of your code. This line is useless.
6) In function viewtype_SelectionChangeFcn you have
global view_type
global kp
The function does assign to each of those variables (at least under some conditions). However, you never use the value of those variables anywhere, and do not "global" them in any other function. These assignments appear to not have any purpose with your current code.
7) In function startstop_Callback you have
global ss
ss=~ss;
and you do read the current value and use it to make decisions. However, you do not "global" the variable in any other routine, and you do not initialize the variable. When you do not initialize a global variable, it is automatically assigned the value [] (the empty numeric array). You do ss = ~ss, but ~[] is also [], so the value of ss will continue to be []. Your code has
if ss
but "if []" is false. Your code continues to
elseif ~ss
but "elseif ~[]" is false. Therefore you will not execute the code to start and you will not execute the code to stop.
You do not use ss in any other routine. If you are attempting to keep track of state entirely within one routine, then instead of using "global" you should use "persistent".
8) Avoid using "global": it is the slowest way to access variables.
http://matlab.wikia.com/wiki/FAQ#How_can_I_share_data_between_callback_functions_in_my_GUI.28s.29.3F
9) You have
function handles = get_ready(handles, filename)
However, you have no calls to this function, and it is not called on your behalf by any callback you have configured. You would have to call it specially as it has the wrong parameters to be called directly as a callback.
