
are not. Hence F4 is split next, as in Fig. 9.11c. Now, if we assume that all pixels
within each resulting region are homogeneous with respect to that region and
that, after comparing all the regions, regions F41 and F42 are found to be
identical or similar. These regions are therefore merged, as in Fig. 9.11d.
9.3 Boundary-Based Segmentation
The region-based methods discussed in the previous section aim to segment an
image by partitioning the image into sets of interior and exterior pixels accord-
ing to the similarity of certain image properties. Boundary-based techniques, on
the other hand, seek to extract object boundaries directly, based on identifying ...