Preview webcam in app designer

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 after

• the preview is working, i just blocked the camera.

Thank you.

Answer 1

[Animesh]

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.