Imaging Web Demo

Graylevel Watershed

This demonstration shows the segmentation of images by the watershed algorithm. The implementation is based on the immersion process analogy, using the gray levels as a topological relief. The objects to be separated should be dark, i.e. low gray values. This demo provided a pre-processing filter (Gaussian filter with σ as tuning parameter) to denoise the image first in order to avoid over segmentation. A Java version is also available as an ImageJ plugin.
[1] D. Sage, M. Unser, Teaching Image-Processing Programming in Java, IEEE Signal Processing Magazine, 2003.
[2] M. Tsukahara et al., Coupled Tomography and Distinct-Element-Method Approach to Exploring the Granular ..., Physical Review E, June 2008.
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