automatically segment an image using otsu's method in matlab

To automatically segment an image using Otsu's method in MATLAB, you can use the graythresh function, which calculates the threshold value for image segmentation based on Otsu's method.

Here's an example code snippet that demonstrates the use of graythresh function:

main.m
% read the input image
I = imread('input_image.tif');

% convert the image to grayscale
I_gray = rgb2gray(I);

% calculate the threshold value using Otsu's method
level = graythresh(I_gray);

% segment the image based on the threshold value
BW = imbinarize(I_gray, level);

% display the segmented image
imshow(BW);
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In this code snippet, the input image is first read and converted to grayscale. Then, the graythresh function is used to calculate the threshold value based on Otsu's method. Finally, the imbinarize function is used to segment the grayscale image based on the calculated threshold value. The resulting segmented image is displayed using the imshow function.