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Sam

Buttondownfcn callback on live video data (preview)

Asked by Sam
on 16 Nov 2012

Hello,

I am currently trying to initiate a callback routine when the user presses on an axis that contains a live video stream, i.e.

frame = getsnapshot(handles.vidObj);
axes = imshow(frame, 'Parent', handles.axes_stream); 
preview(handles.vidObj, axes); % assign vidObj to axes

However, I have not yet been able to achieve this despite looking at various discussions. I presume it is because the displayed video is stopping my mouse button being registered and the callback routine is not working.

Any help would be appreciated.

  1 Comment

Sam
on 18 Nov 2012

Anyone? I'm starting to think that maybe it's not possible.

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1 Answer

Answer by Sean de Wolski
on 16 Nov 2012

I am guessing that preview is nullifying your ButtonDownFcn (just an educated guess though). Thus you would need to reinstate your ButtonDownFcn on the axes after calling preview.

  8 Comments

Sean de Wolski
on 26 Nov 2012

Sam, if your license's SMS is current, please contact Technical Support.

Image Analyst
on 26 Nov 2012

I haven't tried clicking on the live video axes. Would clicking on a button be an acceptable workaround? Because I know I can click on buttons while I have a live image in an axes, and it does the callback operations just fine.

Sam
on 26 Nov 2012

I will contact Technical Support and see what they have to say and report back. For now, I will use buttons to provide the necessary functionality.

Cheers everyone!


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