create a binary image with values [0; 1] from a grayscale image by doing a threshold comparison, in matlab

To create a binary image from a grayscale image by thresholding in MATLAB, you can use the im2bw function. This function converts a grayscale image to a binary image using a threshold value. Here's an example:

main.m
% Read in a grayscale image
gray_img = imread('myimage.png');

% Set the threshold value
threshold_val = 128;

% Convert to binary image using threshold value
binary_img = im2bw(gray_img, threshold_val/255);

% Display the binary image
imshow(binary_img);
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In this example, we read in a grayscale image using imread. We then set a threshold value of 128 (out of 255, as MATLAB uses values from 0 to 1 internally for images). We then pass the grayscale image and threshold value to the im2bw function, which converts the image to a binary image using the threshold value. Finally, we display the resulting binary image using imshow.