How can I use imfindcircles in real time video?

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I have written below code which gives photo from camera and mark circles on them
vid = videoinput('winvideo', 1, 'RGB24_640x480');
set(vid, 'FramesPerTrigger', Inf);
set(vid, 'ReturnedColorspace', 'rgb')
vid.FrameGrabInterval = 5;
data = getsnapshot(vid);
[center,radii] = imfindcircles(data,[20 60],'ObjectPolarity','dark','Sensitivity',0.9,'Method','twostage');
imshow(data)
h=viscircles(center,radii);
how can I make this working in real time?

Answers (3)

Image Analyst
Image Analyst on 13 Mar 2013
You may not be able to. How long does it take to call imfindcircles()? Wrap it in tic and toc to find out. It may take longer than 1/30th of a second or whatever your definition of "real time" is.

kurczak
kurczak on 14 Mar 2013
It takes to long for this operation. I worked on this for a while and i add something like this
while(vid.FramesAcquired<=200)
data = getsnapshot(vid);
imshow(data)
[center,radii] = imfindcircles(data,[20 60],'ObjectPolarity','dark','Sensitivity',0.9,'Method','twostage');
h=viscircles(center,radii);
end
It's working but the image is to slow it's supposed to be live. I know I'm operating on photos from camera. Using getdata() I get frames but then I can't use imffindcicles beacuse it's operating on photos.
  1 Comment
Image Analyst
Image Analyst on 14 Mar 2013
Well it was just a suggestion. You're free to work on a faster method. And no, I don't have one ready to hand over to you, or even know of one. Plus I don't use Simulink.

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Spandan Tiwari
Spandan Tiwari on 20 Mar 2013
Two ways to get IMFINDCIRCLES run faster in your code are:
1) Sending in the image at a lower resolution.
2) Use smaller radius range, if possible.

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