MATLAB: Calculate the difference between adjacent pixels

image processing

Hello Team,

I have written this Matlab code to calculate the absolute difference between horizontally adjacent pixels.

imageArray = imread('index.jpg');

information = imfinfo('index.jpg')

for j = 1:1:information.Height – 1

for i = 1:1:information.Width – 2

D_hor(i,j) = abs(imageArray(i,j) – imageArray(i+1, j))

i = i +1

end

j = j+1

end

Once I started verifying the code using a simple Matrix, it displayed incorrect results.

Can you please help me?

Regards,

Try this instead

abs(diff(imageArray,1,2))

In three lines, no loop:

>> new_im = flipped_im;
>> idx = new_im(:,:,1)>new_im(:,:,2) | new_im(:,:,1)>new_im(:,:,3);
>> new_im(idx(:,:,[1,1,1])) = 255;

and checking:

>> isequal(mod_im,new_im)
ans = 1

For MATLAB versions R2016b and later you can simplify the index code:

idx = any(new_im(:,:,1)>new_im(:,:,2:3),3);

Try something like this:

for i = 1:n-1
    next_image = uigetfile('*p*');
    ImageArray = cat(3,ImageArray,next_image);
end

When this loop finishes, the variable ImageArray is your multidimensional array.