canny filter manually in matlab

To apply the Canny filter manually in matlab, you can follow these steps:

1. Read the image using imread() function.

main.m
img = imread('image.jpg');
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2. Convert the image to grayscale.

main.m
gray_img = rgb2gray(img);
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3. Apply Gaussian filter to the image using imfilter() function.

main.m
gaussian_img = imfilter(gray_img,fspecial('gaussian'));
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4. Calculate gradient magnitude and direction of the smoothed image using edge() function.

main.m
[grad_mag, grad_dir] = edge(gaussian_img,'Canny');
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5. Finally, display the gradient magnitude image using imshow() function.

main.m
imshow(grad_mag);
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You can adjust the parameters of imfilter() and edge() functions to get different results based on your requirements.