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Preview webcam in app designer

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Roye Vadana
Roye Vadana 2021-9-2
回答： Animesh 2024-2-16
Hey,
I want to plot a webcam in app designer by preview in axis, but when i do it my x axis and y axis are gone.
how i can plot with showing x axis and y axis.
This is my code :
app.img = webcam;
app.frame = snapshot(app.img);
app.im = image(app.Main_image, zeros(size(app.frame),'uint8'));
axis(app.Main_image,'image');
preview(app.img,app.im);
before Before after After
  • the preview is working, i just blocked the camera.
Thank you.

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回答（1 个）

Animesh
Animesh 2024-2-16
The possible reason for axes to disappear is that the “preview” function is overriding the axis properties. In this case you can try to update the axis properties after calling “preview”.
You can do something like this after calling “preview”:
% To bring back the axes by setting the properties after preview
drawnow; % Ensure the preview updates the UI
app.UIAxes.XTick = [];
app.UIAxes.YTick = [];
app.UIAxes.Visible = 'on'; % Make the axes visible again
Here, the “drawnow” command forces MATLAB to update the Figure Window which might be necessary for the changes to take effect.
I have attached an example “mlapp” for your reference.

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