videoinput error in real time detection

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Hello sir, While I was working on real time face detection I got this error when I run my code for the second time. I have written stop(vid) and clear (vid) at the end of script,still I am getting this following error.

"winvideo: The device associated with device ID 1 is already in use. A new videoinput object cannot be created for this device while it is in use."

Can you tell me how to get rid of this? Thank you

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Nachiket Patki 2017-5-2

编辑：Walter Roberson 2017-5-2

在 MATLAB Online 中打开

my code is here:

vid = videoinput('winvideo',1,'YUY2_640x480');
triggerconfig(vid ,'manual');
set(vid, 'TriggerRepeat',inf);
set(vid, 'FramesPerTrigger',1);
vid.ReturnedColorspace = 'rgb';
vid.Timeout = 6;
start(vid);
while(1)
    facedetector = vision.CascadeObjectDetector;     
      trigger(vid); 
      img = getdata(vid, 1);
      bbox = step(facedetector, img);
      hello = insertObjectAnnotation(img,'rectangle',bbox,'Face');
      imshow(hello);
      imwrite(img(bbox(2):bbox(2)+bbox(4),bbox(1):bbox(1)+bbox(3)),'Faceimage.jpg')
end
stop(vid),clear vid

Nachiket Patki 2017-5-5

Also, why the face detection process is in general very slow, can you please tell me what must the reason for this? Because I tried code in python but its comparatively very fast. Thank you

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