i dont get an output for this using a GUI and a toggle button. Whats wrong?

Question

Sanjeev 2013-1-31

0
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https://ww2.mathworks.cn/matlabcentral/answers/60683-i-dont-get-an-output-for-this-using-a-gui-and-a-toggle-button-whats-wrong

关闭： MATLAB Answer Bot 2021-8-20

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clc;

source= videoinput('winvideo');

set(source, 'ReturnedColorSpace', 'RGB');

set(source, 'FramesPerTrigger', 1);

set(source, 'TriggerRepeat', inf);

triggerconfig(source, 'manual');

if get(handles.startstop,'Value')

start(source);
thresh = 15/255;
pause(2);
trigger(source);
bg = getdata(source,1,'double'); 
bg=bg(:,:,:,1);
bg_bw = rgb2gray(bg); 
set(handles.startstop,'String','Stop');
set(handles.startstop,'Value',1);
handles.source = source;
guidata(gcbo, handles);
drawnow();
fr_size = size(bg);             
width = fr_size(2);
height = fr_size(1);
f = zeros(height, width);

else

set(handles.startstop,'String','Start');
set(handles.startstop,'Value',0);
source = handles.source;
stop(source);
handles.source = [];
guidata(gcbo, handles)

end

 while(get(handles.startstop,'Value'));
    trigger(source);
     fr = getdata(source,3,'double');
     fr1=fr(:,:,:,1);
    fr_bw1 = rgb2gray(fr1);
    trigger(source);
    fr2=fr(:,:,:,2);
    fr_bw2 = rgb2gray(fr2); 
   trigger(source);
   fr3=fr(:,:,:,3);             % read in frame-i+1
    fr_bw3 = rgb2gray(fr3);       % convert frame-i+1 to grayscale
    fr_diff1 = abs((fr_bw1) - (fr_bw2));  % First frame Difference cast operands as double to avoid negative overflow
    fr_diff2 = abs((fr_bw2) - (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
       end

subplot(1,2,1); imshow(fr1); title('REAL TIME VIDEO');

subplot(1,2,2); imshow(uint8(f)); title('DETECTED MOVING OBJECT'); bg_bw=fr_bw1;

end

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Answer 1

Jan 2013-1-31

0
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/60683-i-dont-get-an-output-for-this-using-a-gui-and-a-toggle-button-whats-wrong#answer_73075

在 MATLAB Online 中打开

Please explain the occurring problem with any detail: Do you get an infinite loop, an error message, is the code too slow or does the figure disappear before you can see it?

The debugger can help you to find out, what happens: Set a breakpoint in the code and step through the program line by line.

Btw., you can omit the double FOR loop:

f = 255 * ((fr_diff1 > thresh) & (fr_diff2 > thresh));

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Sanjeev 2013-1-31

在 MATLAB Online 中打开

here is the simplified version of my code

clc;

source = videoinput('winvideo');

set(source, 'ReturnedColorSpace', 'RGB');

set(source, 'FramesPerTrigger', 3);

set(source, 'TriggerRepeat', 50);

triggerconfig(source, 'manual');

start(source);

thresh = 15/255;

trigger(source);

bg = getdata(source,1,'double');

bg=bg(:,:,:,1);

bg_bw = rgb2gray(bg); % convert background to greyscale

% ----------------------- set frame size variables -----------------------

fr_size = size(bg);

width = fr_size(2);

height = fr_size(1);

f = zeros(height, width);

for i=1:50

    trigger(source);
     fr = getdata(source,3,'double');
     fr1=fr(:,:,:,1);
    fr_bw1 = rgb2gray(fr1);
    trigger(source);
    fr2=fr(:,:,:,2);
    fr_bw2 = rgb2gray(fr2); 
   trigger(source);
   fr3=fr(:,:,:,3);             % read in frame-i+1
    fr_bw3 = rgb2gray(fr3);       % convert frame-i+1 to grayscale
    fr_diff1 = abs((fr_bw1) - (fr_bw2));  % First frame Difference cast operands as double to avoid negative overflow
    fr_diff2 = abs((fr_bw2) - (fr_bw3));  % Second frame difference 
cast operands as double to avoid negative overflow
    f = 255 * ((fr_diff1 > thresh) & (fr_diff2 > thresh));
    figure(1),subplot(2,1,1),imshow(fr1)
    subplot(2,1,2),imshow(uint8(f))

end

stop(source); delete(source); clear (source);

Image Analyst 2013-1-31

Don't double space all your code after you paste it in. That is not necessary to get it to show up with one line of code per statement. Simply make sure there is a blank line before it, then highlight it all and click {}Code.