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sobel operator is used for edge detection using first derivative.Horizontal and vertical components used .Gradient is the square root it taken for the sum of two components .

Code:

    clc
;
   
    
%% create a new figure to show the image . 
    newImg 
= imread('Water lilies.jpg');
    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);
 





Attachments:
sobel.GIF
sobel.GIF [ 54.99 KiB | Viewed 23641 times ]

_________________
M. S. Rakha, Ph.D.
Queen's University
Canada
Author:
Mastermind
User avatar Posts: 2715
Have thanks: 74 time
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