In plants producing praline products a Delta robot picks up the chocolates
from a conveyor belt. Then they are put into a box. A vision system tracks
the chocolates and guides the robots.
Sometimes it occurs that two chocolates on the belt touch each other.
The difficulty is to separate them. The robot actually has to realize
that it is dealing with two objects and has to grip them separately.
There is an immense interest by biologists in segmenting images. For example
cells are often quite close to each other if not even touching.
Searchers investigate on the migration of cells and want to track or count
them. Image processing and especially morphological image analysis is
a promising technique to investigate probes. To achieve this, however,
segmenting the image is often a prerequisite.
Flooding the Image
This implementation of the watershed algorithm is based on the immersion analogy. A gray level image is seen as a topological map, the gray values representing the elevation.
The image is then flooded by water sources situated at every local minimum.
As soon as the water coming from one source touches the water coming from
a neighboring source, a dam is built. This dam represents a watershed
line which separates adjacent objects.