GUI with Video Mosaicking

I am currently working on a Video Mosaicking project that will in cooperate up to 10 cameras together for a end user to see around their vehicle. Currently I am designing a GUI with an older version of the code we plan to use. However I keep running into a few problems.

As part of my GUI I would like to be able to pause the program mid process and then resume right where I left off. However when I program the *pause * command into a button and try to use it. The program either acts as if it is not responding and then doesn't work or takes a good while to pause the program.

Then when I choose to resume the program with the GUI with a pause off command the program doesn't resume crashes.

The current configuration I am using only has 2 web cameras over USB, MATLAB 2012, MatLab Image Acquisition Toolbox, and the code below.

The computer hardware that I am running these commands/program off of is a HP laptop with i5-2520M CPU @ 2.50GHz 2.50GHz and 6 GB of RAM.

If you need the figure file feel free to email me.

[e-mail]

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

% Last Modified by GUIDE v2.5 12-Feb-2013 11:49:17

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

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

% Update handles structure
guidata(hObject, handles);

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

% --- Outputs from this function are returned to the command line.
function varargout = GUI_interface_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 ACTIVATE button.
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)
% test

pause off

Canvas = single(zeros(800,700,3));%set resolution

resolution = 'MJPG_640x480';%set resolution

rgb2i = vision.ColorSpaceConverter('Conversion', 'RGB to intensity');
C1Vid = imaq.VideoDevice('winvideo',1, resolution);%C1
C2Vid = imaq.VideoDevice('winvideo',2, resolution);%C2
hVideo1 = vision.VideoPlayer;
hVideo1.Name  = 'Camera 1 (Left)';
hVideo1.Position = [0,500,640,480];
hVideo2 = vision.VideoPlayer;
hVideo2.Name = 'Camera 2 (Right)';
hVideo2.Position = [640,500,640,480];
hVideo3 = vision.VideoPlayer;
hvideo3.Name = 'Output1';
hVideo3.Position = [0,50,640,480];
hVideo4 = vision.VideoPlayer;
hvideo4.Name = 'Output2';
hVideo4.Position = [640,50,640,480];
hdrawmarkers = vision.MarkerInserter('Shape', 'Circle', ...
    'BorderColor', 'Custom', 'CustomBorderColor', [1 0 0]); 
C8geotrans = vision.GeometricTransformer(...
    'OutputImagePositionSource', 'Property',...
    'OutputImagePosition', [1 1 1280 720]);

%C8geotrans = vision.GeometricTransformer(...
 %   'OutputImagePositionSource', 'Property');

% Create a geometric Transformer Estimator object
gte = vision.GeometricTransformEstimator;
gte.Transform = 'Affine'; %was  Nonreflective similarity
gte.RefineTransformMatrix = true;

C8AlphaBlend = vision.AlphaBlender;
C7AlphaBlend = vision.AlphaBlender;
AlphaBlend = vision.AlphaBlender;

nFrames = 0;

while (nFrames < 30)
    C8frame = step(C1Vid);
    C7frame = step(C2Vid);
    C8frameGrayScale=step(rgb2i,C8frame);
    C7frameGrayScale=step(rgb2i,C7frame);

      ptsC8frame = detectSURFFeatures(C8frameGrayScale, 'MetricThreshold',100);
      ptsC7frame = detectSURFFeatures(C7frameGrayScale, 'MetricThreshold',100);

      [C8features, validC8Pts]  = extractFeatures(C8frameGrayScale, ptsC8frame);
      [C7features, validC7Pts]  = extractFeatures(C7frameGrayScale, ptsC7frame);
       C82C7index_pairs = matchFeatures(C8features, C7features,'MatchThreshold',100, ...
       'MaxRatio', 0.6);
       C8matchedToC7 = validC8Pts(C82C7index_pairs(:,1));
       C7matchedToC8 = validC7Pts(C82C7index_pairs(:,2));
       strongestC8 = C8matchedToC7.selectStrongest(50);
       strongestC7 = C7matchedToC8.selectStrongest(50);
       matC8coords = strongestC8.Location;
       matC7coords = strongestC7.Location;

       % Display the current image and the corner points
       DetectedImage1 = step(hdrawmarkers, C8frame, matC8coords);
       DetectedImage2 = step(hdrawmarkers, C7frame, matC7coords);

     % step(hVideo1, C8frame); %CanvasAndC8
     % step(hVideo2, C7frame); %CanvasAndC7
     % step(hVideo3, DetectedImage1);
     % step(hVideo4, DetectedImage2);

       nFrames=nFrames+1;
  end

   [C8tform, C8inlierIdx] = step(gte, C8matchedToC7.Location, C7matchedToC8.Location);

   C8transformed = step(C8geotrans,C8frame,C8tform);
   %figure(1)
   %imshow(C8transformed)

      CanvasAndC7 = step(C7AlphaBlend,Canvas,C7frame);
      CanvasAndC8 = step(C8AlphaBlend,Canvas,C8transformed);

      Blend1   = step(AlphaBlend,CanvasAndC8,CanvasAndC7);
      Blend2 = step(AlphaBlend,CanvasAndC7,CanvasAndC8);
      FullBlend   = step(AlphaBlend,Blend1,Blend2);
      figure()
      image(FullBlend);

release(C1Vid);
release(C2Vid);

% --- Executes on button press in PAUSE button.
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)
 pause on
 pause

% --- Executes on button press in Resume.
function pushbutton7_Callback(hObject, eventdata, handles)
% hObject    handle to pushbutton7 (see GCBO)
% eventdata  reserved - to be defined in a future version of MATLAB
% handles    structure with handles and user data (see GUIDATA)
pause off

% --- Executes on button press in SYSTEM REST button.
function pushbutton3_Callback(hObject, eventdata, handles)
% hObject    handle to pushbutton3 (see GCBO)
% eventdata  reserved - to be defined in a future version of MATLAB
% handles    structure with handles and user data (see GUIDATA)
imaqreset
imaqfind
clear all
clc

% --- Executes on button press in CLOSE PROGRAM button.
function pushbutton4_Callback(hObject, eventdata, handles)
% hObject    handle to pushbutton4 (see GCBO)
% eventdata  reserved - to be defined in a future version of MATLAB
% handles    structure with handles and user data (see GUIDATA)
quit
quit force

% --- Executes on selection change in Individual Camera Selection.
function listbox1_Callback(hObject, eventdata, handles)
% hObject    handle to listbox1 (see GCBO)
% eventdata  reserved - to be defined in a future version of MATLAB
% handles    structure with handles and user data (see GUIDATA)

% Hints: contents = cellstr(get(hObject,'String')) returns listbox1 contents as cell array
%        contents{get(hObject,'Value')} returns selected item from listbox1
imaqreset
hVideo1 = vision.VideoPlayer;
hVideo1.Name  = 'Camera 1 (Left)';
hVideo1.Position = [0,500,640,480];
hVideo2 = vision.VideoPlayer;
hVideo2.Name  = 'Camera 1 (Left)';
hVideo2.Position = [0,600,640,480];

resolution = 'MJPG_640x480';%set resolution

rgb2i = vision.ColorSpaceConverter('Conversion', 'RGB to intensity');
C1Vid = imaq.VideoDevice('winvideo',1, resolution);%C1
C2Vid = imaq.VideoDevice('winvideo',2, resolution);%C2

nFrame=0;
nFrame2=0;
contents = cellstr(get(hObject,'String'));
A=contents{get(hObject,'Value')};
if strcmp(A,'~Select Individual Camera Feed~')==1

elseif strcmp(A,'Camera 1')==1 ;
    while (nFrame<200)
        C8frame = step(C1Vid);
        step(hVideo1, C8frame); %CanvasAndC8v
        nFrame=nFrame+1;
    end

else strcmp(A,'Camera 2')==1; 
     while (nFrame2<200)
         C7frame = step(C2Vid);
        step(hVideo2, C7frame); %CanvasAndC7
        nFrame2=nFrame2+1;
     end

end
release(C1Vid)
release(C2Vid)

% --- Executes during object creation, after setting all properties.
function listbox1_CreateFcn(hObject, eventdata, handles)
% hObject    handle to listbox1 (see GCBO)
% eventdata  reserved - to be defined in a future version of MATLAB
% handles    empty - handles not created until after all CreateFcns called

% Hint: listbox controls usually have a white background on Windows.
%       See ISPC and COMPUTER.
if ispc && isequal(get(hObject,'BackgroundColor'), get(0,'defaultUicontrolBackgroundColor'))
    set(hObject,'BackgroundColor','white');
end

% --- Executes on button press in Mosaick View.
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

% --- Executes on key press with focus on listbox1 and none of its controls.
function listbox1_KeyPressFcn(hObject, eventdata, handles)
% hObject    handle to listbox1 (see GCBO)
% eventdata  structure with the following fields (see UICONTROL)
%  Key: name of the key that was pressed, in lower case
%  Character: character interpretation of the key(s) that was pressed
%  Modifier: name(s) of the modifier key(s) (i.e., control, shift) pressed
% handles    structure with handles and user data (see GUIDATA)