Matlab - ¿guardar de forma automatica una captura con Inwrite?

function pushbutton1_Callback(hObject, eventdata, handles)

captura2=handles.captura;

[nombre1,ruta1]=uiputfile({'*.jpg';'*.tif'},'GUARDAR IMAGEN');

if nombre1==0

    return;

else

    imwrite(captura2,strcat(ruta1,nombre1));

end

function varargout = guardar_varias_imagenes1(varargin)

gui_Singleton = 1;

gui_State = struct('gui_Name',       mfilename, ...

                   'gui_Singleton',  gui_Singleton, ...

                   'gui_OpeningFcn', @guardar_varias_imagenes1_OpeningFcn, ...

                   'gui_OutputFcn',  @guardar_varias_imagenes1_OutputFcn, ...

                   'gui_LayoutFcn',  [] , ...

                   'gui_Callback',   []);

if nargin && ischar(varargin{1})

    gui_State.gui_Callback = str2func(varargin{1});

end

if nargout

    [varargout{1:nargout}] = gui_mainfcn(gui_State, varargin{:});

else

    gui_mainfcn(gui_State, varargin{:});

end

function guardar_varias_imagenes1_OpeningFcn(hObject, eventdata, handles, varargin)

A = imread('ngc6543a.jpg');

image(A, 'Parent', handles.axes1);

handles.output = hObject;

guidata(hObject, handles);

function varargout = guardar_varias_imagenes1_OutputFcn(hObject, eventdata, handles)

varargout{1} = handles.output;

function pushbutton1_Callback(hObject, eventdata, handles)

captura2 = getimage(handles.axes1);

ruta1=pwd;

time=char(datetime); pos=strfind(time,':'); time(pos)='_';

nombre1=['imagen ',time,'.jpg'];

imwrite(captura2,fullfile(ruta1,nombre1));