How to run webcam on an axis in app designer ?

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Ahmer Shahid
Ahmer Shahid 2018-11-1
评论： Ahmer Shahid 2018-12-4
function startcamerabutton_Callback(app, event)
% hObject handle to startcamerabutton (see GCBO)
% eventdata reserved - to be defined in a future version of MATLAB
% handles structure with handles and user data (see GUIDATA)
app.camera=videoinput('winvideo',1);
imshow(app.camera,'Parent',app.livedisplay);
end
  1 个评论
Ahmer Shahid
Ahmer Shahid 2018-11-1
This Error showing up there.......
Error using imageDisplayValidateParams Expected input number 1, I, to be one of these types:
numeric, logical
Instead its type was videoinput.
Error in images.internal.imageDisplayValidateParams (line 11) validateattributes(common_args.CData, {'numeric','logical'},...
Error in images.internal.imageDisplayParseInputs (line 78) common_args = images.internal.imageDisplayValidateParams(common_args);
Error in imshow (line 245) images.internal.imageDisplayParseInputs({'Parent','Border','Reduce'},preparsed_varargin{:});

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Astarag Chattopadhyay
编辑：Astarag Chattopadhyay 2018-11-23
Hi Ahmer,
You do not need to use "videoinput" object you can use "webcam" object.
In your app define two properties like this:
properties (Access = private)
webcamObject;
imageObject;
end
You can define the startup function using the following code snippet:
function startupFcn(app)
app.webcamObject = webcam;
app.imageObject = image(app.UIAxes);
axis(app.UIAxes,'ij')
res = split(app.webcamObject.Resolution,'x');
app.UIAxes.XLim = [0,str2double(res{1})];
app.UIAxes.YLim = [0,str2double(res{2})];
app.webcamObject.preview(app.imageObject);
end
This will setup the UIAxis with the resolution of the webcam object and start the preview.
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Astarag Chattopadhyay
Astarag Chattopadhyay 2018-12-4
Which version of MATLAB you are working on?
If you want to take a snapshot you can add a snapshot button to the app and add a callback to the button where you may use the function "snapshot".
Ahmer Shahid
Ahmer Shahid 2018-12-4
I'm using Matlab R2018a, I'm already working on that but when I use snapshot or getsnapshot then it give me error that snapshot is invalid function for webcam.
I can use snapshot function for videoinput but I cannot get the live streaming on axis while using videoinput.

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