Edge detection: Difference between revisions

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[[Marr–Hildreth algorithm|The Marr-Hildreth edge detector]]<ref>{{Cite book |last=Gonzalez |first=Rafael |title=Digital Image Processing |publisher=Pearson Education |year=2018 |isbn=978-0-13-335672-4 |edition=4th}}</ref> is distinguished by its use of the Laplacian of Gaussian (LoG) operator for edge detection in digital images. Unlike other edge detection methods, the LoG approach combines Gaussian smoothing with second derivative operations, allowing for simultaneous noise reduction and edge enhancement. The key advantage of this method lies in its ability to detect edges at various scales by adjusting the standard deviation of the Gaussian kernel, enabling detection of fine details as well as broader transitions. Moreover, the technique leverages zero-crossing detection on the LoG response to precisely locate edges, offering robustness against noise and maintaining edge continuity. This approach is particularly effective for detecting edges with clear boundaries in images while minimizing false positives due to noise, making it a valuable tool in computer vision applications where accurate edge localization is crucial.

== Code for Edgeedge Detectiondetection using Prewitt, Scharr and Sobel Operatoroperator ==

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>

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=== Edge Detectiondetection using Sobel operator ===

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

% MATLAB code for Sobel operator

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==References==

M. Gupta, S.N. Tazi, A. Jain and Deepika, "Edge Detection Using Modified Firefly Algorithm", Computational Intelligence and Communication Networks (CICN) 2014 International conference on, pp. 167-173, 14-16 Nov. 2014.

[https://ieeexplore.ieee.org/document/7065467 View Article]

[https://scholar.google.com/scholar?as_q=Edge+Detection+Using+Modified+Firefly+Algorithm&as_occt=title&hl=en&as_sdt=0%2C31 Google Scholar]

<references />

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*[[:doi:10.5201/ipol.2012.gjmr-lsd|A-contrario line segment detection with code and on-line demonstration]]

* [https://www.mathworks.com/discovery/edge-detection.html Edge detection using MATLAB]

* [http://www.mathworks.com/matlabcentral/fileexchange/48908-accurate-subpixel-edge-___location Subpixel edge detection using Matlab] {{Webarchive|url=https://web.archive.org/web/20211216123504/http://www.mathworks.com/matlabcentral/fileexchange/48908-accurate-subpixel-edge-___location |date=2021-12-16 }}

* [https://photokit.com/tools/effects/edgedetect/ Image Tools Effects - Edgedetect]

* [https://sdk.docutain.com/blogartikel/edge-detection-for-image-processing Edge Detection for Image Processing]