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Restricted Hysteresis Reduce Redundancy in Edge Detection

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DOI: 10.4236/jsip.2013.43B028    3,710 Downloads   4,741 Views   Citations

ABSTRACT

In edge detection algorithms, there is a common redundancy problem, especially when the gradient direction is close to -135°, -45°, 45°, and 135°. Double edge effect appears on the edges around these directions. This is caused by the discrete calculation of non-maximum suppression. Many algorithms use edge points as feature for further task such as line extraction, curve detection, matching and recognition. Redundancy is a very important factor of algorithm speed and accuracy. We find that most edge detection algorithms have redundancy of 50% in the worst case and 0% in the best case depending on the edge direction distribution. The common redundancy rate on natural images is approximately between 15% and 20%. Based on Canny’s framework, we propose a restriction in the hysteresis step. Our experiment shows that proposed restricted hysteresis reduce the redundancy successfully.

Conflicts of Interest

The authors declare no conflicts of interest.

Cite this paper

B. Li, U. Söderström, S. Réhman and H. Li, "Restricted Hysteresis Reduce Redundancy in Edge Detection," Journal of Signal and Information Processing, Vol. 4 No. 3B, 2013, pp. 158-163. doi: 10.4236/jsip.2013.43B028.

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