create a filled white circle by pixel values in matlab

To create a white circle by pixel values in MATLAB, you need to follow these steps:

1. Define the radius of the circle.
2. Define the center of the circle.
3. Define the size of the image.
4. Create a grid of x-y coordinates inside the image.
5. Calculate the distance between each point in the grid and the center of the circle.
6. Set the pixel values to white for all points within the radius.

Here's a code snippet that implements this approach:

main.m
% Define the radius of the circle
radius = 100;

% Define the center of the circle
cx = 200;
cy = 200;

% Define the size of the image
image_size = 400;

% Create a grid of x-y coordinates inside the image
[x, y] = meshgrid(1:image_size, 1:image_size);

% Calculate the distance between each point in the grid and the center of the circle
distance = sqrt((x - cx).^2 + (y - cy).^2);

% Set the pixel values to white for all points within the radius
image_data = ones(image_size) .* (distance <= radius);

% Display the resulting image
imshow(image_data);
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In this code, meshgrid() is used to create a grid of (x, y) coordinates inside the image. Then, the Euclidean distance between each point in the grid and the center of the circle is calculated using the formula distance = sqrt((x - cx)^2 + (y - cy)^2). Finally, the pixel values are set to white (1) for all points within the radius, and the resulting image is displayed using imshow().