Timeout error getting frame webcam in deploying standalone app by app designer

Hi, please help.

I try to deploy an app compiled by matlab app designer 2022a to another PC. This app simply just open webcam in one ax, and one button, when it is pushed, it takes picture from camera to show in second ax.

it works perfectly on the PC, that I created the app. But on the PC (which was installed right runtime version) it shows this error when I try to open installed app:

Timeout occured while trying to get a frame from the webcam. Error in => OKELA.mlapp at line 91

Thanks a lot.

classdef OKELA < matlab.apps.AppBase

% Properties that correspond to app components

properties (Access = public)

UIFigure matlab.ui.Figure

ZapnoutkameruButton matlab.ui.control.Button

UIAxes2 matlab.ui.control.UIAxes

UIAxes matlab.ui.control.UIAxes

end

properties (Access = public)

cam % Description

end

% Callbacks that handle component events

methods (Access = private)

% Code that executes after component creation

function startupFcn(app)

app.UIAxes2.Visible = "off";

evalin("base","clear cam");

app.cam = webcam('USB2.0 Camera');

frame = app.cam.snapshot;

im = image(app.UIAxes,zeros(size(frame),'uint8'));

axis(app.UIAxes,'image');

preview(app.cam,im);

end

% Button pushed function: ZapnoutkameruButton

function ZapnoutkameruButtonPushed(app, event)

img = app.cam.snapshot;

image(app.UIAxes2,img);

app.UIAxes2.Visible = 'off';

axis(app.UIAxes2,'image');

end

end

% Component initialization

methods (Access = private)

% Create UIFigure and components

function createComponents(app)

% Create UIFigure and hide until all components are created

app.UIFigure = uifigure('Visible', 'off');

app.UIFigure.Position = [100 100 640 480];

app.UIFigure.Name = 'MATLAB App';

% Create UIAxes

app.UIAxes = uiaxes(app.UIFigure);

title(app.UIAxes, 'live')

xlabel(app.UIAxes, 'X')

ylabel(app.UIAxes, 'Y')

zlabel(app.UIAxes, 'Z')

app.UIAxes.Position = [16 129 284 336];

% Create UIAxes2

app.UIAxes2 = uiaxes(app.UIFigure);

title(app.UIAxes2, 'obraz')

xlabel(app.UIAxes2, 'X')

ylabel(app.UIAxes2, 'Y')

zlabel(app.UIAxes2, 'Z')

app.UIAxes2.Position = [340 129 281 335];

% Create ZapnoutkameruButton

app.ZapnoutkameruButton = uibutton(app.UIFigure, 'push');

app.ZapnoutkameruButton.ButtonPushedFcn = createCallbackFcn(app, @ZapnoutkameruButtonPushed, true);

app.ZapnoutkameruButton.Position = [258 43 103 23];

app.ZapnoutkameruButton.Text = 'Zapnout kameru';

% Show the figure after all components are created

app.UIFigure.Visible = 'on';

end

end

% App creation and deletion

methods (Access = public)

% Construct app

function app = OKELA

% Create UIFigure and components

createComponents(app)

% Register the app with App Designer

registerApp(app, app.UIFigure)

% Execute the startup function

runStartupFcn(app, @startupFcn)

if nargout == 0

clear app

end

end

% Code that executes before app deletion

function delete(app)

% Delete UIFigure when app is deleted

delete(app.UIFigure)

end

end

end

[Image Analyst]

Is that the entire .mlapp file? If not, attach the .mlapp file with the paperclip icon so I can try it on my two computers. I have the compiler and webcams, so I can check it.

If you have the Image Acquisition app, see if youi see the webcam adapter when you do this

>> imaqtool

[liem ngo]

Hi,

yes, it is entire .mlapp file.

I dont have webcam adapter, after enter:

>> imaqtool

I got the warning:

Warning: The Image Acquisition Tool app will be removed in a future release. Use the

Image Acquisition Explorer app instead.

> In imaqtool (line 13)

Warning: No Image Acquisition adaptors found. To install Hardware Support Packages,

use Add-On Explorer.

So it confuses me, I dont have adaptor, but I do have the newer one: Image Acquisition Explorer.

Is it problem. I am new one with matlab.

Thank you

[liem ngo]

I solved out this problem by not using the camera in Startupfunction. So I think that Matlab set some time for Startupfunction? In this case, I would like to learn how to control this timer error. If someone could advise me?

Thank you

[Image Analyst]

If you have the Image Acquisition Toolbox you should be able to run imageAcquisitionExplorer and see something like this:

but you don't need the Image Acquisition Toolbox to use webcams. You just need to get the webcam add on from the Add-ons Explorer on the home tab of the tool ribbon.

[liem ngo]

thank you for your answer.