find the stars in an image in matlab

There are various ways to find stars in an image in MATLAB, but one common approach is using the "imfindcircles" function from the Image Processing Toolbox.

The steps to use this function are:

1. Load the image using "imread".
2. Convert the image to grayscale using "rgb2gray" if necessary.
3. Set the range of radii to search for using "radiusRange" parameter.
4. Set the sensitivity of the algorithm to detect circles using "sensitivity" parameter.
5. Use "imfindcircles" function with the image and the parameter set to find the circles.
6. Plot the circles on the original image using "viscircles" function.

Here's an example code:

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

% Convert to grayscale
grayImg = rgb2gray(img);

% Set the range of radii and sensitivity
radiusRange = [5 20];
sensitivity = 0.95;

% Find the circles using imfindcircles
[centers, radii] = imfindcircles(grayImg, radiusRange, 'Sensitivity', sensitivity);

% Plot the circles on the original image
imshow(img);
hold on;
viscircles(centers, radii,'Color','r');
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Note that the parameters "radiusRange" and "sensitivity" may need to be adjusted depending on the image and the size of the stars to be detected.