clc;
%% create a new figure to show the image .
newImg = imread('onion.png');
% I = imread('cameraman.tif');
figure(1);
%% show the loaded image.
imshow(newImg);
figure(2);
%% convert RGB to gray scale.
I = rgb2gray(newImg)
imshow(I);
%% apply sobel filter.
size(I)
BW = edge(I,'sobel',0.1) ;
imshow(BW);
Chương trình ví dụ sử dụng lọc Sobel trong Matlab:

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