Question Regarding MATLAB GUI, a problem while playing back a live video.

2015 9 7
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更新时间：2015 9 14
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Greetings programmers,
I have completed my codes for live video streaming and wanted to move into GUI to make it look nicer. The problem I have encountered is that when I put my codes into my Start Button Callback function, Matlab always opens another window to show me the video instead of inside the created Axel when I was creating the GUI. Previously I have created a GUI using image processing which uses this function: preview() to show vide insides of axel.
In this coding, my final output is a step(OriginalVideo, FinalProcessed). How do I make it in such a way that my video will stay inside the axel instead of a separate window?
Thank you very much.
Regards,
Akira

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Walter Roberson
Walter Roberson 2015-9-7
Please show the code you use in your Start Button Callback, along with the code you use to play the video.
Akira Chan
Akira Chan 2015-9-7
Dear Mr Walter,
function Start_Callback(hObject, eventdata, handles)
% hObject handle to Start (see GCBO)
% eventdata reserved - to be defined in a future version of MATLAB
% handles structure with handles and user data (see GUIDATA)
LiveVideo = imaq.VideoDevice('winvideo', 1, 'MJPG_640x480');
vidInfo = imaqhwinfo(LiveVideo);
VideoOut = vision.VideoPlayer('Name', 'Live Video Testing', ...
'Position', [50 10 vidInfo.MaxWidth+45 vidInfo.MaxHeight+65]);
while (nFrames < 200)
<Preprocessing Algorithms are here, Fill is the final output of pre-processed image and VideoOut is my Video>
step(VideoOut, Fill);
end
I think I should not use step function here, I need something else maybe?
Thank you very much.
Regards,
Akira

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Walter Roberson
Walter Roberson 2015-9-7

0 个投票

vision.VideoPlayer() appears to always create a new Figure to display the content in. It cannot be configured to display the video in an axes.
To play video in an axis, see the example http://www.mathworks.com/help/vision/examples/video-display-in-a-custom-user-interface.html
Unfortunately the key routine for that, showFrameOnAxis() is example code that I do not have access to so I do not know how it works.

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Akira Chan
Akira Chan 2015-9-7
Dear Mr Walter,
Oh, thank you very much sir. I try that now.
Regards,
Akira
Akira Chan
Akira Chan 2015-9-14
Dear Mr Walter,
You are totally right, I need to use showframeonaxis, but now I have encountered a problem, it only show me a blank axes when I start my system. Nevertheless, I will create a question thread so people will know what to do when come to this problem.
Thank you very much.
Regards,
Akira

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