find a rectangle in an image in matlab

main.m
% Read the image
img = imread('image.jpg');

% Convert the image to grayscale
img_gray = rgb2gray(img);

% Apply threshold to get a binary image
img_bw = imbinarize(img_gray);

% Find connected regions in the binary image
regions = regionprops(img_bw, 'BoundingBox');

% Loop through the regions to find the rectangles
for i = 1:length(regions)
    % Get the bounding box of the region
    bb = regions(i).BoundingBox;
    
    % Check if the bounding box has aspect ratio close to 1 (i.e. a square or rectangle)
    if abs(bb(3)/bb(4) - 1) < 0.1 
        % Draw a rectangle around the region
        rectangle('Position', bb, 'EdgeColor', 'r', 'LineWidth', 2);
    end
end
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