storing the individual frames of a video i(existing on workspace) n to image locations and analyse each frame's image on imtool (perhaps using imwrite?).

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Yagnaseni Roy 2011-10-16

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I have a video on the workspace, which I can open using movieplayer.

Now all I want to do is get each frame of the video and analyze it on imtool.

I tried:

number= size(fractogene)_ (fractogene is the name of my video)_

for frame = 1: number

thisFrame = mov(frame).cdata;

Image = subplot(1,2,1);

        image(thisFrame);
        axis square;
        caption = sprintf('Frame %4d of %d.', frame, numberOfFrames);
        title(caption, 'FontSize', fontSize);
        drawnow;
end

It did open the imtool, but it was just a blue square....what went wrong?

I tried following http://www.mathworks.com/matlabcentral/newsreader/view_thread/295940#801436

but its too hard for me...PLEASE GIVE ME SOMETHING SIMPLE!

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Answer 1

Image Analyst 2011-10-16

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Your first frame is all zeros. Take a look at it with the Variable Editor. Or try typing out a few pixels in the command window like

>> thisFrame(20,30,1)

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Yagnaseni Roy 2011-10-16

Hi,

i put thisframe(20,30,1)

and many other values, but I'm getting all 0s.....

isn't there a simple code like

for frame = 1: number

imwrite(frame,'images of fractogene',jpg)

% which would store my frames as images in a file called 'images of fractogene' as jpg files.

imshow(frame)

end

WOULDNT'T THIS WORK?

Image Analyst 2011-10-16

No that would not work. You're writing out the loop index "frame", which is just a single number, as an image. And your "thisframe" is all zeros for some reason - I have no idea why - maybe your movie is all black.

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Answer 2

Yagnaseni Roy 2011-10-16

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I did

for frame = 1:number
fractogene(frame)= getframe;
end
    fractogene(117)
ans = 
         cdata: [240x320 uint16]
      colormap: [0x3 double]
 As you can see, I got a value...is this anything substantial?How can I plot it, as I didn't get a plot...*BOLD TEXT*