How to get accumulated motion image in a video?

I need accumulated image of a video... I tried with the following code.... But i get wrong output... Can anyone help me and findout error in my code....

     %Testing the input video file 
     %Accumulated motion%
    [FileName PathName] = uigetfile('*.avi','Select a video file for testing','D:\ME PROJECT\daria bend.avi');
    file = fullfile(PathName,FileName);
    robj = mmreader(file);
    vidfrm = read(robj);
     %frm=double(vidfrm);
    dur = robj.Duration
    numF = robj.NumberOfFrames

    %Computation of ami
     m=0;
    for k=2:numF;
        f1=vidfrm(:,:,:,k);
        imshow(f1);
        h1=getframe;
        %[x,map]=frame2im(h1);
        g1=rgb2gray(f1);
        f2=vidfrm(:,:,:,k-1);
        imshow(f2);
        h2=getframe;
        %[x1,map1]=frame2im(h2);
        g2=rgb2gray(f2);
        g=imabsdiff(g1,g2);
        m=m+g;
    end
    m;
    figure(1),imshow(m);
     ami=m/numF;
     figure(2),imshow(ami);

    Sorry i cannot upload video now.. use any grayscale video like weizmann dataset for it... Actually the figure(2) have to dipaly some accumulated o/p when it is divided by total num of frames.. But i get ly black screen... Pls help me...!

[Matt J]

I suggest that you remove "Urgent..." from your title, before someone comes along and closes your question down.

Also, you should markup your code to make it more readable.

[Ramya Sampath]

Sorry... I removed it now... Pls explain and answer my question... Now its clear i think...

Answer 1

[Image Analyst]

Those are probably floating point arrays, so use []:

imshow(ami, []);
imshow(m, []);