Error in imabsdiff of two images

I want to do the operation on two images.I have total 4 images ..first I want to use image 1 and image 2 and then image 3 and image 4. I am getting error in imabsdiff. I need your help.

My code is:

 imgFiles=dir('*.jpg');
numFiles=length(imgFiles);
for n=1:numFiles
img=imgFiles(n).name;
compareimg=imgFiles(n+1).name;
P=imabsdiff(img,compareimg);
figure
imshow(P,[]);
end

Answer 1

[Walter Roberson]

You are trying to take the image difference between file names. You need to read in the files and compare the contents.

[swati mane]

Sir thanks for your help. But I am not getting what you said. I am trying by using imread but i am confused in which file should be read as i want to perform in loop.

[Walter Roberson]

img=imread(imgFiles(n).name);
compareimg=imread(imgFiles(n+1).name);

[swati mane]

Sir my updated code is:

imgFiles = dir('*.jpg');
numFiles = length(imgFiles);
for n = 1:numFiles
    img        = imread(imgFiles(n).name);
    compareimg = imread(imgFiles(n+1).name);
    P          = imabsdiff(img,compareimg);
    figure
    imshow(P,[]);
end

But in this code i am getting error in compareimg=imread(imgFiles(n+1).name)

It shows error index exceeds matrix dimensions.

Please help me in the same.

[Jan]

@swati: I've formatted your code to make it readable. You can do this by your own also.

If n==numFiles the expression imgFiles(n+1).name must fail. So you can run the loop until numFile-1 only.

[swati mane]

Thank you very much @ Walter Roberson and @ Jan.