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

""

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)

Answer 1

[divya agarwal]

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.

[Exton]

how do i get the last frame so that i can use a for loop to find the different