find difference between two images block wise

i have two images one is standard image and the other is reference image i need to find the difference between 1st block of standard image with the first block of reference image and so on the code i used for blocking is S = imread ('standard image'); R = imread ('reference image');

% then converted images to grayscale images S = rgb2gray(S); R = rgb2gray (R);

% blocking of both images( as both images have 1600x2560 size) so i'm dividing it into 16 blocks of 4*4 matrix with block size of 400x640

div1= [400 400 400 400]; div2 = [640 640 640 640];

Bs = mat2cell (S, div1, div2); Br = mat2cell (R, div1,div2);

for viewing the blocks i can use imshow (Bs{1,1}) to Bs {4,4} OR simply by imshow Br {1} to Br {16}

i need to find the difference by subtracting the blocks. i can do it manually but i need a loop to find it all on it own please need help

Answer 1

[Filza Ashraf]

these are reference and standard images and if there is any difference in image then consider it that these images are different

Answer 2

[Dishant Arora]

 SubtractedCell = cellfun(@minus,Bs,Br,'Un',0)

[Filza Ashraf]

sir it doesn't give me any output kindly elaborate it please

[Dishant Arora]

Do you get any warning,any error?? Output's gonna be a cell, individual arrays representing difference of corresponding blocks in 2 images(cells).

[Image Analyst]

Please correct the grammar or rephrase so that we can understand this. I have not the slightest idea what you are asking now.