Sobel Edge Detection Filter

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The Sobel filter can be used for edge detection. There are two mask matrices that convolve with the image data (matrix). The images are grayscale.

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It is one of the image segmentation techniques used in Computer Vision (CV) software in its initial preprocessing steps called early vision. After the early vision preprocessing a CV system can, for example, use artificial intelligence to identify, classify, or count objects in an image.

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Contributed by: Daniel de Souza Carvalho (March 2011)
Open content licensed under CC BY-NC-SA


Snapshots


Details

Sobel gradient edge operator:

Vertical matrix:

Horizontal matrix:

Reference: D. A. Forsyth and J. Ponce, Computer Vision: A Modern Approach, Upper Saddle River, NJ: Prentice Hall, 2003.



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