Thesis (PDF) - Signal & Image Processing Lab
Thesis (PDF) - Signal & Image Processing Lab
Thesis (PDF) - Signal & Image Processing Lab
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6.3. STUDY OF EWT PROPERTIES 89<br />
(a) (b)<br />
Figure 6.15: (a) Original Lena image. (b) Opened by reconstruction image using SE<br />
of 3x3.<br />
6.3 Study of EWT properties<br />
What are the properties of extrema watershed tree and why use it? The EWT has<br />
two main properties, listed below:<br />
1. This tree representation is self-dual.<br />
2. The Extrema watershed tree provides implicit hierarchical segmentation due to<br />
the following reasons:<br />
• A tree is created in watershed-like process.<br />
• Small area extrema are leaves.<br />
• Bigger flat zones are close to the root.<br />
• Vertices connected in the tree usually have similar gray levels.<br />
6.3.1 Implicit segmentation<br />
Recalling that the extrema-watershed tree is built in a process that is very similar<br />
to flooding, it is natural to investigate the potential of using the resulting tree for
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