Hello! I have a homework about pattern search using segmentation, and I got this error message: Array dimensions must match for binary array op. I only have the searching part of the code (or I hope this code do that).

img = imread('brickwall.jpg');
part = imread('brickwall_sample2.png');
[rows, cols] = size(img);
[part_row, part_col] = size(part);
diffimg = zeros(size(img));
minx = 1; miny = 1; minval = Inf;
for x=1:rows - part_row
    for y=1:cols - part_col
        cut =  img(x:x+part_row-1, y:y+part_col-1);
        diff = sum(sum( abs(cut - part) )); %this is where the problem occurs
        diffimg(x,y) = diff;
        if ( diff < minval ) 
            minval = diff;
            minx = x;
            miny = y;
        end
    end
end
imshow(diffimg,[]);
result = zeros([rows, cols, 3],'uint8');
result(:,:,1) = img;
result(:,:,2) = img;
result(:,:,3) = img;
result(minx, miny:miny+part_col-1,1) = 255;
result(minx+part_row-1, miny:miny+part_col-1,1) = 255;
result(minx:minx+part_row-1, miny,1) = 255;
result(minx:minx+part_row-1, miny+part_col-1,1) = 255;
imshow(result,[]);

Thank you for the answers :)

And the two pictures are here:

Answer 1

[Wick]

This isn't an answer to fix your code. This is an answer as to why it breaks. Try inserting these two lines:

size(cut)
size(part)

after you define cut and before you define diff. cut is [155 x 1311] where as part is [155 x 437 x 3]

The imread command naturally returns a three-page variable. Each n x m matrix represents the red, green, and blue channel. When you defined cut you only defined it on the first page. But you're comparing it to the three-paged part variable. Since it's homework, I'll leave the rest to you... :)

[Dorottya Forrai]

Thank you for your answer :) It helps a lot, and I found the brick in the picture :)