Webcam preview in GUI axes is shown as black image

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Valentin Stegmaier
Valentin Stegmaier 2019-6-14
评论： Valentin Stegmaier 2019-6-15
Hi there,
i'm trying to show the live video of a webcam in an GUI right now using the axes area.
By using the preview function in it's own window i can see the live video of the webcam.
But by using the preview function with the image handle to show the sequence in the axes area there is just a black image displayed.
I already changed the resolution and tried a different webcam, but i always get the black image.
The Webcam is a Logitech c922 Pro Stream and i'm using Windows 10 64 bit with Matlab R2019a.
Thank you very much for your help in advance.
Best
Valentin
Here is the code i'm using:
function pushbutton_start_Callback(hObject, eventdata, handles)
cam = webcam(2);
frame = snapshot(cam);
im = image(handles.axes_video,zeros(size(frame),'uint8'));
axis(handles.axes_video,'image');
preview(cam,im)
end

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Geoff Hayes
Geoff Hayes 2019-6-14

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