Edge detection: Difference between revisions

Revision as of 19:18, 18 January 2025

Revision as of 12:49, 19 January 2025

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Source:<ref>{{Cite web |date=2021-10-11 |title=Edge detection using Prewitt, Scharr and Sobel Operator |url=https://www.geeksforgeeks.org/edge-detection-using-prewitt-scharr-and-sobel-operator/ |access-date=2024-05-08 |website=GeeksforGeeks |language=en-US}}</ref>

=== Edge Detectiondetection using Prewitt Operatoroperator ===

<syntaxhighlight lang="matlab" line="1">

% MATLAB code for prewitt

% operator edge detection

k = imread("logo.png");

k = rgb2gray(k);

k1 = double(k);

p_msk = [-1 0 1; -1 0 1; -1 0 1];

kx = conv2(k1, p_msk, 'same');

ky = conv2(k1, p_msk', 'same');

ked = sqrt(kx.^2 + ky.^2);

% display the images.

Line 309:

% display the full edge detection.

imtool(abs(ked),[]);

</syntaxhighlight>

=== Edge Detectiondetection using Scharr Operatoroperator ===

<syntaxhighlight lang="matlab" line="1">

% Scharr operator -> edge detection

k = imread("logo.png");

k = rgb2gray(k);

k1 = double(k);

s_msk = [-3 0 3; -10 0 10; -3 0 3];

kx = conv2(k1, s_msk, 'same');

ky = conv2(k1, s_msk', 'same');

ked = sqrt(kx.^2 + ky.^2);

% display the images.

imtool(k,[]);

% display the edge detection along x-axis.

imtool(abs(kx), []);

% display the edge detection along y-axis.

imtool(abs(ky), []);

% display the full edge detection.

imtool(abs(ked), []);

</syntaxhighlight>

=== Edge DetectionDdtection using Sobel Operatoroperator ===

<syntaxhighlight lang="matlab" line="1">

% MATLAB code for Sobel operator

% edge detection

k = imread("logo.png");

k = rgb2gray(k);

k1 = double(k);

s_msk = [-1 0 1; -2 0 2; -1 0 1];

kx = conv2(k1, s_msk, 'same');

ky = conv2(k1, s_msk', 'same');

ked = sqrt(kx.^2 + ky.^2);

% display the images.

imtool(k,[]);

% display the edge detection along x-axis.

imtool(abs(kx), []);

% display the edge detection along y-axis.

imtool(abs(ky), []);

%display the full edge detection.

imtool(abs(ked),[]);

% display the full edge detection.

imtool(abs(ked), []);

</syntaxhighlight>