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?).

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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回答（2 个）

Image Analyst
Image Analyst 2011-10-16

0 个投票

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
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
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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Yagnaseni Roy
Yagnaseni Roy 2011-10-16

0 个投票

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*

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