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how do i extract the frame and shw it out with imshow (HELP)

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Exton
Exton 2012-10-20
""
obj=VideoReader('111.wmv');
a=read(obj);
frames=get(obj,'numberOfFrames');
for k = 1 : frames
I(k).cdata = a(:,:,:,k);
I(k).colormap = [];
end
implay(I)
""
111.wmv is my video(in this video got 148 frames) and what i need is extract all the frame to compare example"Frame1-frame2"(but how do i extract the frame 1 and frame 2... then the other)

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divya agarwal
divya agarwal 2012-10-20
a=read(obj,1); this will give you the first frame,when instead of '1' you will write '2' you will get the second frame and so on.
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Exton
Exton 2012-10-20
编辑：Exton 2012-10-20
how do i get the last frame so that i can use a for loop to find the different

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