with image size of 512x512 and a threshold value of t and a starting position of x,y and a maximum region of 20 pixels generate code for a grow region in matlab

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

% Set the starting point and the maximum region size
x = 100;
y = 100;
max_size = 20;

% Set the threshold value
t = 128;

% Get the size of the image
[img_height, img_width] = size(img);

% Create a visited matrix to keep track of pixels that were already visited
visited = zeros(img_height, img_width);

% Create a region map to store the resulting region
region_map = zeros(img_height, img_width);

% Perform region growing
grow_region(x, y);

% Display the region map
imshow(region_map);

% Define the recursive function for region growing
function grow_region(x, y)
    global img t visited region_map max_size;

    % If the new region size has reached the maximum size or the pixel was
    % already visited, return
    if region_map(y, x) || max_size == 0
        return;
    end

    % Calculate the absolute difference between the pixel value and the
    % threshold value
    diff = abs(img(y, x) - t);
    
    % If the absolute difference is less than the threshold, add the pixel
    % to the region    
    if diff < t
        region_map(y, x) = 1;
        
        % Mark the pixel as visited
        visited(y, x) = 1;
        
        % Decrease the maximum region size
        max_size = max_size - 1;
        
        % Check the neighboring pixels and recursively call the function
        % for the pixels that satisfy the threshold condition
        if x > 1 && ~visited(y, x - 1)
            grow_region(x - 1, y);
        end
        if x < size(img, 2) && ~visited(y, x + 1)
            grow_region(x + 1, y);
        end
        if y > 1 && ~visited(y - 1, x)
            grow_region(x, y - 1);
        end
        if y < size(img, 1) && ~visited(y + 1, x)
            grow_region(x, y + 1);
        end
    end
end
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