Modified watershed algorithm considering zero-crossing point of gradient

Dong-In Park; Yun-Ho Ko; Ji-Hong Lee; Young-Woo Park

doi:10.1117/12.784376

9 January 2008 Modified watershed algorithm considering zero-crossing point of gradient

Dong-In Park, Yun-Ho Ko, Ji-Hong Lee, Young-Woo Park

Proceedings Volume 6794, ICMIT 2007: Mechatronics, MEMS, and Smart Materials; 679418 (2008) https://doi.org/10.1117/12.784376
Event: ICMIT 2007: Mechatronics, MEMS, and Smart Materials, 2007, Gifu, Japan

Abstract

In this paper, we propose a modified watershed algorithm considering zero-point of gradient to obtain a correct edge of a region. The conventional watershed algorithm decide priority considering gradient of a region to be extended. However if the grey levels of two neighboring seeds are quite different, the ridge line obtained by the conventional watershed algorithm is not coincided with the correct edge. It is probable that the point where gray level extreme value occurs will be estimated as an edge of two neighboring regions. Therefore more correct edge of a region can be obtained if the expansion of watershed algorithm is delayed where the extreme value occurs. The position where the gray level extreme value occurs corresponds to the position where the zero-crossing of gradient occurs. So we adjust the priority to postpone expansion at the zero-crossing point of gradient. We compare the proposed method with the conventional method and validate that this proposed method can extract more correct edge of a region.

Citation Download Citation

Dong-In Park, Yun-Ho Ko, Ji-Hong Lee, and Young-Woo Park "Modified watershed algorithm considering zero-crossing point of gradient", Proc. SPIE 6794, ICMIT 2007: Mechatronics, MEMS, and Smart Materials, 679418 (9 January 2008); https://doi.org/10.1117/12.784376

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