define region of pixels radially with radius r from x y position in image in matlab

main.m
% Read the grayscale image
I = im2gray(imread('image.jpg'));

% Define the center point (x, y) and the radius r
x = 100;
y = 100;
r = 50;

% Create a meshgrid of the same size as the image
[xx,yy] = meshgrid(1:size(I,2), 1:size(I,1));

% Compute the Euclidean distance from each pixel to the center point
dist = sqrt((xx-x).^2 + (yy-y).^2);

% Create a binary mask indicating which pixels are within the circular region
mask = dist <= r;

% Display the original image with the circular region of interest overlaid
imshow(I);
hold on;
viscircles([x,y],r,'Color','r','LineWidth',2);
hold off;

% Extract the pixels within the circular region
pixels_within_region = I(mask);
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