Feature-Finding > Find Edges

Identifies edge pixels as white using the specified edge finding algorithm [1-3].

1. Type

The edge finding algorithm used

  • Sobel: Detect edges using the Sobel algorithm
  • Prewitt: Detect edges using the Prewitt algorithm
  • Roberts: Detect edges using the Roberts algorithm
  • Laplacian: Detect edges using the Laplacian algorithm
  • Zero-Cross: Detect edges using the Zero-Cross algorithm
  • Canny: Detect edges using the Canny algorithm (tends to cleaner edges than other algorithms) [3]

2. Threshold

A weakness setting for the edge find algorithm. Higher thresholds are weaker edge finds, but maybe produce less noise. (Recommended: 0.01)

Referrences

[1] Canny, John, “A Computational Approach to Edge Detection,” IEEE Transactions on Pattern Analysis and Machine Intelligence,Vol. PAMI-8, No. 6, 1986, pp. 679-698.

[2] Lim, Jae S., Two-Dimensional Signal and Image Processing, Englewood Cliffs, NJ, Prentice Hall, 1990, pp. 478-488.

[3] Parker, James R., Algorithms for Image Processing and Computer Vision, New York, John Wiley & Sons, Inc., 1997, pp. 23-29.

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