I rewrote my moving object detection code and tried integrating a toggle button with it still to no result.

i used the toggle button to start the video input and the processing and this should carry on till i press the toggle button again. But i get an error of the following

??? Undefined function or variable "bg".

Error in ==> Untitled>togglebutton1_Callback at 89 fr_size = size(bg);

Error in ==> gui_mainfcn at 96 feval(varargin{:});

Error in ==> Untitled at 42 gui_mainfcn(gui_State, varargin{:});

Error in ==> @(hObject,eventdata)untitled('togglebutton1_Callback',hObject,eventdata,guidata(hObject))

??? Error while evaluating uicontrol Callback

here is my code

function varargout = untitled(varargin)

% UNTITLED MATLAB code for untitled.fig

% UNTITLED, by itself, creates a new UNTITLED or raises the existing

% singleton*.

% H = UNTITLED returns the handle to a new UNTITLED or the handle to

% the existing singleton*. %

% UNTITLED('CALLBACK',hObject,eventData,handles,...) calls the local

% function named CALLBACK in UNTITLED.M with the given input arguments.

% % UNTITLED('Property','Value',...) creates a new UNTITLED or raises the % existing singleton*. Starting from the left, property value pairs are % applied to the GUI before untitled_OpeningFcn gets called. An % unrecognized property name or invalid value makes property application % stop. All inputs are passed to untitled_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 untitled

% Last Modified by GUIDE v2.5 05-Jan-2013 15:43:02

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

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

% Update handles structure guidata(hObject, handles);

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

% --- Outputs from this function are returned to the command line. function varargout = untitled_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 togglebutton1. function togglebutton1_Callback(hObject, eventdata, handles) % hObject handle to togglebutton1 (see GCBO) % eventdata reserved - to be defined in a future version of MATLAB % handles structure with handles and user data (see GUIDATA)

% Hint: get(hObject,'Value') returns toggle state of togglebutton1

while get(hObject,'Value')

source = videoinput('winvideo');

set(source,'FramesPerTrigger',Inf);

thresh = 15;

start(source);

fr_size = size(bg);

width = fr_size(2);

height = fr_size(1);

f = zeros(height, width);

%f2 = zeros(height, width);

bg =getdata(source(1)); % read in 1st frame as background frame bg_bw = rgb2gray(bg); % convert background to greyscale

   for i = 2:3:(length(source)-1);

    fr1 = getdata(source(i-1));       % read in frame-i-1

    fr_bw1 = rgb2gray(fr1);       % convert frame-i-1 to grayscale

    fr2 = getdata(source(i));         % read in frame-i

    fr_bw2 = rgb2gray(fr2);       % convert frame-i to grayscale

    fr3 = getdata(source(i+1));       % read in frame-i+1

    fr_bw3 = rgb2gray(fr3);       % convert frame-i+1 to grayscale

    fr_diff1 = abs(double(fr_bw1) - double(fr_bw2));  % First frame Difference cast operands as double to avoid negative overflow

    fr_diff2 = abs(double(fr_bw2) - double(fr_bw3));  % Second frame difference cast operands as double to avoid negative overflow

        for j=1:width                 % if fr_diff > thresh pixel in foreground
            for k=1:height
                if ((fr_diff1(k,j) > thresh) && (fr_diff2(k,j) > thresh))
                f(k,j) = 255;
                else
                f(k,j) = 0;
                end
            end
        subplot(1,2,2);
   mot=getdatea(uint8(f));
   imagesc(mot);
   title('MOVING OBJECT')
        end
   end

end stop(source);

[Walter Roberson]

http://www.mathworks.com/matlabcentral/answers/13205-tutorial-how-to-format-your-question-with-markup

[Jan]

Walter's suggestion has been ignored. The code remains unreadable. But the OP asks new questions.

Answer 1

[Image Analyst]

It doesn't know what bg is yet because you haven't defined it yet. Make this line:

bg =getdata(source(1));

the first line in togglebutton1_Callback and see what happens.