MATLAB: How to find the difference of adjacent pixels in an image? Thanks

image processingImage Processing Toolboxlocal binary patternspatial filter

How to find the difference of adjacent pixels in an image? Thanks

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In which direction? Assuming left and right, you can use conv2() or imfilter():

img = imread('moon.tif');
diffImage = imfilter(img, [1, -1]);
imshow(diffImage, [])

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MATLAB: Fill 4-connected cells exclusively

I assume you meant your sample matrices to be 8-by-8 instead of 1-by-64? If that's true, then it looks like you want to change a pixel from a 0 to a 1 only if all of its 4-connected neighbors are 1. The following code uses bwhitmiss to identify such pixels:

se1 = [0 1 0; 1 0 1; 0 1 0];
se2 = [0 0 0; 0 1 0; 0 0 0];
pixels_to_change = bwhitmiss(BW1, se1, se2);

Now just elementwise-or with the original matrix:

BW3 = BW1 | pixels_to_change

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