Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: The watershed concept and its use in segmentation : a brief history   The watershed is one of the most used tools in image segmentation. We present
how its concept is born and developed over time. Its implementation as an
algorithm or a hardwired device evolved together with the technology which
allowed it. We present also how it is used in practice, first together with
markers, and later introduced in a multiscale framework, in order to produce
not a unique partition but a complete hierarchy.

32
The categories of this paper are: atom-ph
8
The categories of this paper are: hep-ex
23
The categories of this paper are: solv-int
33
The categories of this paper are: plasm-ph
13
The categories of this paper are: quant-ph
21
The categories of this paper are: adap-org
9
The categories of this paper are: nlin
24
The categories of this paper are: dg-ga
12
The categories of this paper are: nucl-th
4
The categories of this paper are: cond-mat
17
The categories of this paper are: q-fin
2
The categories of this paper are: math
7
The categories of this paper are: hep-th
11
The categories of this paper are: hep-lat
10
The categories of this paper are: q-bio
31
The categories of this paper are: ao-sci