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MUST Corp.

www.must.or.kr

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Page History: Edge Detector

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Page Revision: 2011/03/18 16:26


Edge

  • Points where a large change in image brightness over a short spatial distance occurred
  • is defined by a discontinuity in gray-level values

Roberts Operator

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  • It is the simplest of the edge detection operators and will work best with binary images.

Sobel Operator

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Prewitt Operator

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Derivative operator

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Zero-crossing

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Laplacian Gaussian

Laplacian of Gaussian (LoG)

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Difference Of two Gaussian : DOG

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Edge Detector

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Edge Detector - Noise

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(a) Original image. (b) Image with added noise. (c) Sobel with a 3x3 mask. (d) Sobel with a 7x7 mask. (e) Prewitt with a 3x3 mask. (f) Prewitt with a 7x7 mask. (g) Result from applying a threshold to the 3x3 Prewitt. (h) Result from applying a threshold to the 7x7 Prewitt. (i) Truncated pyramid with a 7x7 mask. (j) Results from applying a threshold to the 7x7 truncated pyramid.


MUST Creative Engineering Laboratory

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