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Buttondownfcn callback on live video data (preview)

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Sam
Sam on 16 Nov 2012
Closed: MATLAB Answer Bot on 20 Aug 2021
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
Sam on 18 Nov 2012
Anyone? I'm starting to think that maybe it's not possible.

Answers (1)

Sean de Wolski
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
Image Analyst
Image Analyst on 26 Nov 2012
Edited: 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
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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