Hi,
This is a known issue in closePreview function when you try to use custom GUI to preview the data.
This bug is fixed in R2019b. So, you can update your MATLAB to latest version.
The following code which defines its own figure CloseRequestFcn callback can be used as a workaround:
%% Connect to webcam
c = webcam(1);
%% Setup preview window
fig = figure('NumberTitle', 'off', 'MenuBar', 'none');
fig.Name = 'My Camera';
ax = axes(fig);
frame = snapshot(c);
im = image(ax, zeros(size(frame), 'uint8'));
axis(ax, 'image');
%% Start preview
preview(c, im)
setappdata(fig, 'cam', c);
fig.CloseRequestFcn = @closePreviewWindow_Callback;
%% Local functions
function closePreviewWindow_Callback(obj, ~)
c = getappdata(obj, 'cam');
closePreview(c)
delete(obj)
end
Hope this helps!
