MATLAB: ็How to send video object in function to GUI in Matlab

image processingMATLABmatlab guivideovideo processing

I want to send video obj use for when press start program but no data to processing and I press exit and I press start again video object OBJ has already been started. can't processing in program

then I want to know send video obj to GUI

Best Answer

Adisorn - what is your order of operations? Do you launch the GUI and then call realtimefunction and pass in the handle to the GUI? Where is webcam3 defined or is this a function?

If you are trying to save the vid object to handles then you could do something like

 function [] = realtimefunction(GuiHandle)
 % your code
 handles.vid = vid;
 guidata(GuiHandle, handles);

which will update the handles structure of your GUI with the vid object. Then in your exit_Callback, you could do something like

 function exit_Callback(hObject, eventdata, handles)
 if isfield(handles, 'vid') && ~isempty(handles.vid)
     delete(handles.vid); % or close, whatever is relevant
     handles.vid = [];
     guidata(hObject, handles)
 end

As an aside, you should try to avoid using global variables.

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Sérgio - I suspect the problem might be with your while loop that is preventing the disconnect_Callback from being processed. You could try adding a brief pause to the body of the while loop so that the other function can be evaluated (but I think that you will see one or more errors when doing this since your while loop condition is always set to true and once vid becomes invalid, any call to it will result in an error.

An alternative approach might be to use a timer which you start and stop from your "connect" and "disconnect" callbacks respectively. The timer would fire periodically (at a rate to be determined by you) and its callback would acquire the video (or image) from your phone and display it in the axes.

Your code might look something like

 function connect_Callback(hObject, eventdata, handles)
 % hObject    handle to pushbutton1 (see GCBO)
 % eventdata  reserved - to be defined in a future version of MATLAB
 % handles    structure with handles and user data (see GUIDATA)
 handles.timer = timer('Name','MyTimer',               ...
                       'Period',1,                    ... 
                       'StartDelay',1,                 ... 
                       'TasksToExecute',inf,           ... 
                       'ExecutionMode','fixedSpacing', ...
                       'TimerFcn',{@timerCallback,handles.figure1}); 
 handles.vid = ipcam('http://100.75.51.93:8081/', 'admin', '12345');
 guidata(hObject,handles);
 start(handles.timer);
 
 % --- Executes on button press in disconnect.
function disconnect_Callback(hObject, eventdata, handles)
if isfield(handles, 'vid') && isfield(handles, 'timer')
    stop(handles.timer);
    stop(handles.vid);
    flushdata(handles.vid);
    cla(handles.axes1);
    delete(handles.vid);
    handles.vid = [];
    guidata(hObject, handles);
end
 function [] = timerCallback(~,~,guiHandle)
 if ~isempty(guiHandle)
    [Imag_filled1, Imag_in1] = IPProcessamentoRed(handles.vid);
    axes(handles.axes1);
    imshow(Imag_in1);
    axes(handles.axes2);
    imshow(Imag_filled1);
 end

Note how the global variable has been removed and is stored as a field to the handles structure (along with the timer object). The abovie is untested but it might give you an idea of what you can do.

Best Answer

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