canny filter in matlab

To apply Canny filter in Matlab, you can use the edge function with 'canny' as the method parameter. Here's an example code:

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

% Convert the image to grayscale
img_gray = rgb2gray(img);

% Apply the Canny filter with default parameters
edge_img = edge(img_gray, 'canny');

% Display the original and filtered images
subplot(1,2,1);
imshow(img);
title('Original Image');

subplot(1,2,2);
imshow(edge_img);
title('Canny Filtered Image');
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In this code, we first read an RGB image and convert it to grayscale. Then we apply the Canny filter using the edge function with the 'canny' method. Finally, we display the original and filtered images side by side using the subplot function.

You can adjust the parameters of the Canny filter by passing additional arguments to the edge function. For example, you can specify the thresholds for edge detection as follows:

main.m
edge_img = edge(img_gray, 'canny', [low_threshold, high_threshold]);
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Where low_threshold and high_threshold are scalar values between 0 and 1 that determine the sensitivity of the edge detection algorithm.