圖片坎入至中，用imresize

function varargout = m0107_4(varargin)
% M0107_4 MATLAB code for m0107_4.fig
%      M0107_4, by itself, creates a new M0107_4 or raises the existing
%      singleton*.
%
%      H = M0107_4 returns the handle to a new M0107_4 or the handle to
%      the existing singleton*.
%
%      M0107_4('CALLBACK',hObject,eventData,handles,...) calls the local
%      function named CALLBACK in M0107_4.M with the given input arguments.
%
%      M0107_4('Property','Value',...) creates a new M0107_4 or raises the
%      existing singleton*.  Starting from the left, property value pairs are
%      applied to the GUI before m0107_4_OpeningFcn gets called.  An
%      unrecognized property name or invalid value makes property application
%      stop.  All inputs are passed to m0107_4_OpeningFcn via varargin.
%
%      *See GUI Options on GUIDE's Tools menu.  Choose "GUI allows only one
%      instance to run (singleton)".
%
% See also: GUIDE, GUIDATA, GUIHANDLES

% Edit the above text to modify the response to help m0107_4

% Last Modified by GUIDE v2.5 08-Jan-2021 00:42:09

% Begin initialization code - DO NOT EDIT
gui_Singleton = 1;
gui_State = struct('gui_Name',       mfilename, ...
                   'gui_Singleton',  gui_Singleton, ...
                   'gui_OpeningFcn', @m0107_4_OpeningFcn, ...
                   'gui_OutputFcn',  @m0107_4_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
% End initialization code - DO NOT EDIT


% --- Executes just before m0107_4 is made visible.
function m0107_4_OpeningFcn(hObject, eventdata, handles, varargin)
% This function has no output args, see OutputFcn.
% hObject    handle to figure
% eventdata  reserved - to be defined in a future version of MATLAB
% handles    structure with handles and user data (see GUIDATA)
% varargin   command line arguments to m0107_4 (see VARARGIN)

% Choose default command line output for m0107_4
handles.output = hObject;

% Update handles structure
guidata(hObject, handles);

% UIWAIT makes m0107_4 wait for user response (see UIRESUME)
% uiwait(handles.figure1);


% --- Outputs from this function are returned to the command line.
function varargout = m0107_4_OutputFcn(hObject, eventdata, handles)
% varargout  cell array for returning output args (see VARARGOUT);
% hObject    handle to figure
% eventdata  reserved - to be defined in a future version of MATLAB
% handles    structure with handles and user data (see GUIDATA)

% Get default command line output from handles structure
varargout{1} = handles.output;


% --------------------------------------------------------------------
function Untitled_1_Callback(hObject, eventdata, handles)
% hObject    handle to Untitled_1 (see GCBO)
% eventdata  reserved - to be defined in a future version of MATLAB
% handles    structure with handles and user data (see GUIDATA)


% --------------------------------------------------------------------
function Untitled_2_Callback(hObject, eventdata, handles)
% hObject    handle to Untitled_2 (see GCBO)
% eventdata  reserved - to be defined in a future version of MATLAB
% handles    structure with handles and user data (see GUIDATA)
im1=handles.im1;
im2=handles.im2;
r2=handles.r2;
c2=handles.c2;
[r c p]=size(im1);
im1((r-r2)/2:(r-r2)/2+r2-1,(c-c2)/2:(c-c2)/2-1+c2,:)=im1((r-r2)/2:(r-r2)/2+r2-1,(c-c2)/2:(c-c2)/2+c2-1,:)+im2;
axes(handles.axes3);
imshow(im1);
handles.im3=im1;
guidata(hObject,handles);

% --------------------------------------------------------------------
function Untitled_3_Callback(hObject, eventdata, handles)
% hObject    handle to Untitled_3 (see GCBO)
% eventdata  reserved - to be defined in a future version of MATLAB
% handles    structure with handles and user data (see GUIDATA)
imo=handles.im1;
ime=handles.im3;
r2=handles.r2;
c2=handles.c2;
[r c p]=size(imo);
im=ime((r-r2)/2:(r-r2)/2+r2-1,(c-c2)/2:(c-c2)/2+c2-1,:)-imo((r-r2)/2:(r-r2)/2+r2-1,(c-c2)/2:(c-c2)/2+c2-1,:);
axes(handles.axes4);
imshow(im);

% --------------------------------------------------------------------
function Untitled_4_Callback(hObject, eventdata, handles)
% hObject    handle to Untitled_4 (see GCBO)
% eventdata  reserved - to be defined in a future version of MATLAB
% handles    structure with handles and user data (see GUIDATA)
[f p]=uigetfile('*.jpg');
pf=[p f];
im=imread(pf);
axes(handles.axes1);
imshow(im);
handles.im1=im;
guidata(hObject,handles);


% --------------------------------------------------------------------
function Untitled_5_Callback(hObject, eventdata, handles)
% hObject    handle to Untitled_5 (see GCBO)
% eventdata  reserved - to be defined in a future version of MATLAB
% handles    structure with handles and user data (see GUIDATA)
[f p]=uigetfile('*.jpg');
pf=[p f];
im=imread(pf);
[r2 c2 p2]=size(im);
im=imresize(im,[0.5*r2,0.5*r2]);
axes(handles.axes2);
imshow(im);
handles.im2=im;
handles.r2=r2*0.5;
handles.c2=c2*0.5;
guidata(hObject,handles);