Trying to get snapshots of webcam to show up within GUI using App Designer

Says it all on the tin. I have my code running on a timer that reiterates every half a second or so, and in the function that gets reiterated, I want to have a webcam snapshot be visible within the app I'm making. I don't want the image to appear in a separate window. How would I do this?

Answer 1

[Rishabh Singh]

Hey,

You can refer to "timer" for executing a scheduled command and to this documentation to refer to how to create a callback function.

Below is the callback function to load image from your webcam whenever it is called,

properties (Access = private)

Property % Description

cam = webcam("USB Video Device");

end

methods (Access = private)

function loadImage(app, obj, event, string_arg)

img = app.cam.snapshot();

app.Image.ImageSource = img;

disp('run');

end

end

% Callbacks that handle component events

methods (Access = private)

% Image clicked function: Image

function ImageClicked(app, event)

t = timer('StartDelay' , 1, 'Period', 0.5, 'ExecutionMode', 'fixedRate');

t.TimerFcn = @(obj, event)loadImage(app);

start(t);

end

end

You can call the above function using any of the callback function suitable to your specific need, here I have used "ImageClicked" callback to activate the timer function.

Hope this helps.