Home > basic, gui, matlab, matlab Code > Simple Selecting Points in 2 images using Matlab GUIDE

Simple Selecting Points in 2 images using Matlab GUIDE

Following is the program that lets you load two images and click points in both of them. It does not store the correspondence however because it stores points in the array so if you keep the order same in the both images it could be used for the point correspondence.
Use the guide command to make it them you can work on the each component by clicking on each component and selecting callback function.

function varargout = momentsGUI(varargin)
% MOMENTSGUI M-file for momentsGUI.fig
%      MOMENTSGUI, by itself, creates a new MOMENTSGUI or raises the existing
%      singleton*.
%
%      H = MOMENTSGUI returns the handle to a new MOMENTSGUI or the handle to
%      the existing singleton*.
%
%      MOMENTSGUI('CALLBACK',hObject,eventData,handles,...) calls the local
%      function named CALLBACK in MOMENTSGUI.M with the given input arguments.
%
%      MOMENTSGUI('Property','Value',...) creates a new MOMENTSGUI or raises the
%      existing singleton*.  Starting from the left, property value pairs are
%      applied to the GUI before momentsGUI_OpeningFcn gets called.  An
%      unrecognized property name or invalid value makes property application
%      stop.  All inputs are passed to momentsGUI_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 momentsGUI

% Last Modified by GUIDE v2.5 09-Jan-2010 14:30:50

% Begin initialization code - DO NOT EDIT
gui_Singleton = 1;
gui_State = struct('gui_Name',       mfilename, ...
                   'gui_Singleton',  gui_Singleton, ...
                   'gui_OpeningFcn', @momentsGUI_OpeningFcn, ...
                   'gui_OutputFcn',  @momentsGUI_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 momentsGUI is made visible.
function momentsGUI_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 momentsGUI (see VARARGIN)

% Choose default command line output for momentsGUI
handles.output   = hObject;
handles.selected = 0;
handles.point1 = [];
handles.point2 = [];

% Update handles structure
guidata(hObject, handles);

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

% --- Outputs from this function are returned to the command line.
function varargout = momentsGUI_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;

% --- Executes on button press in pushbutton1.
function pushbutton1_Callback(hObject, eventdata, handles)
% hObject    handle to pushbutton1 (see GCBO)
% eventdata  reserved - to be defined in a future version of MATLAB
% handles    structure with handles and user data (see GUIDATA)
[FileName,PathName,FilterIndex] = uigetfile('*.*');
img1 = imread([PathName FileName]);
%img1 = imread('carstick.bmp');
axes(handles.axes1);
imshow(img1);
handles.img1 = img1;
handles.size1 = size(img1);
% Update handles structure
guidata(hObject, handles);

% --- Executes on button press in pushbutton2.
function pushbutton2_Callback(hObject, eventdata, handles)
% hObject    handle to pushbutton2 (see GCBO)
% eventdata  reserved - to be defined in a future version of MATLAB
% handles    structure with handles and user data (see GUIDATA)
[FileName,PathName,FilterIndex] = uigetfile('*.*');
img2 = imread([PathName FileName]);
axes(handles.axes2);
imshow(img2);
handles.img2 = img2;
handles.size2 = size(img2);
% Update handles structure
guidata(hObject, handles);
%ginput(2)

% --- Executes on button press in selectImg1PtsPushButton.
function selectImg1PtsPushButton_Callback(hObject, eventdata, handles)
% hObject    handle to selectImg1PtsPushButton (see GCBO)
% eventdata  reserved - to be defined in a future version of MATLAB
% handles    structure with handles and user data (see GUIDATA)
axes(handles.axes1);
pt = ginput(1);
pt=fliplr(pt);

if (sum(pt <=handles.size1(1:2))*sum(pt>[0 0]))
    handles.point1 = [handles.point1 ; pt];
    guidata(hObject, handles);
    handles.point1
    pt = round(pt);
    axes(handles.axes1);
    hold on;
    plot(pt(2), pt(1), 'r*');
end

% --- Executes on button press in selectPointImg2.
function selectPointImg2_Callback(hObject, eventdata, handles)
% hObject    handle to selectPointImg2 (see GCBO)
% eventdata  reserved - to be defined in a future version of MATLAB
% handles    structure with handles and user data (see GUIDATA)

axes(handles.axes2);
pt = ginput(1);
pt=fliplr(pt);

if (sum(pt <=handles.size2(1:2))*sum(pt>[0 0]))
    handles.point2 = [handles.point2 ; pt];
    guidata(hObject, handles);
    handles.point1
    pt = round(pt);
    axes(handles.axes2);
    hold on;
    plot(pt(2), pt(1), 'r*');
end

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  1. valentine
    November 8, 2010 at 8:36 pm

    I think your code would be very helpful for me, as I need a program to got point correspondence of several images. But unfortunately I cannot run it because there’s no GUI (.fig file) and the .mat file. Could you please let me know the other two files, if you don’t mind? or maybe just a snapshot of the GUIDE and short explanation about what would be in the .mat file???

    I need this kind of code just for studying purposes, so If you don’t mind to share a little bit knowledge, I would be very thankful for you. 🙂

    thanks before.

    • mohsenam
      November 17, 2010 at 6:17 pm

      I will try to find the files for you

  2. sreejith
    January 9, 2015 at 5:19 pm

    This was really helpful for me, thank you very much. I have a doubt. I have added the zoom in, zoom out and pan option to the GUI from tools option. I use this to zoom a particular section of image and select points from there. My problem is, once the cross hairs of ginput appears, i cannot use the zoom options as they are disabled. Currently i first select and zoom the portion of image i need and then press button for selecting points. Is there any other simpler workaround for this?

    • mohsenam
      November 14, 2015 at 7:43 pm

      I actually don’t know the workaround, if you have figured it out can you share?

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