i am using red object detection program,but the prb is i am unable to stop/interrupt the program when its running,plz help me

Question

vishnu andavar 2013-4-17

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https://ww2.mathworks.cn/matlabcentral/answers/72349-i-am-using-red-object-detection-program-but-the-prb-is-i-am-unable-to-stop-interrupt-the-program-whe

    if true
      % codevid = videoinput('winvideo', 1, 'YUY2_640x480');
  set(vid, 'FramesPerTrigger', Inf);
  set(vid, 'ReturnedColorspace', 'rgb')
  vid.FrameGrabInterval = 1;
start(vid)
while(vid.FramesAcquired<=50)
      data = getsnapshot(vid);
      diff_im = imsubtract(data(:,:,1), rgb2gray(data));
      diff_im = medfilt2(diff_im, [3 3]);
      diff_im = im2bw(diff_im,0.18);
      diff_im = bwareaopen(diff_im,300);
      bw = bwlabel(diff_im, 8);
      stats = regionprops(bw, 'BoundingBox', 'Centroid');
      imshow(data)
      hold on
      for object = 1:length(stats)
          bb = stats(object).BoundingBox;
          bc = stats(object).Centroid;
          rectangle('Position',bb,'EdgeColor','r','LineWidth',2)
          plot(bc(1),bc(2), '-m+')
          a=text(bc(1)+15,bc(2), strcat('X: ', num2str(round(bc(1))), '    Y: ', num2str(round(bc(2)))));
          set(a, 'FontName', 'Arial', 'FontWeight', 'bold', 'FontSize', 12, 'Color', 'yellow');
      end 
      hold off
  end
  stop(vid);
  delete(vid);
    end

the program only stops after 50 frames are captured,i dont want to change it, but i should be able to force stop it at between, what is the code for it??

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Answer 1

Image Analyst 2013-4-17

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You can have a checkbox on your GUI that says "Finish now" and then you check it in your while or for loop. If the checkbox is set, you break out. Put this in one of your loops, wherever you think it's appropriate.

if get(handles.checkboxQuit, 'Value')
  break;
end

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dwaipayan chakraborty 2013-5-9

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Here's what worked for me. After using ctrl-c, if it says that the camera is still in use, just type the following in the workspace :

     stop (vid)
     delete (vid)

Image Analyst 2013-5-9

Yeah, kind of like stopping your car by throwing a lug wrench into the serpentine belt instead of turning the ignition key off.

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Answer 2

Walter Roberson 2013-4-17

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The closest you might be able to get without changing that code, would be an arrangement to error out of the program. MATLAB is not designed to be able to force a loop to quit without the cooperation of the loop.

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vishnu andavar 2013-4-18

i am ready to add new code in my program to get out of loop,so what do u think is best code to exit out and i can resume later without the matlab saying "camera already in use ?"

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Answer 3

tairman singh 2013-4-18

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Add this into your while loop

k=get(gcf,'currentkey');

if (k=='s')

   disp('program stopped')
   break

end

and when you press 's' in keyboard you'll be able to get out off the loop and also place these before end flushdata(vid) delete(vid) imaqreset close all clear all

Hope it'll help i'm having the same problem