Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: A Class of LULU Operators on Multi-Dimensional Arrays   The LULU operators for sequences are extended to multi-dimensional arrays via
the morphological concept of connection in a way which preserves their
essential properties, e.g. they are separators and form a four element fully
ordered semi-group. The power of the operators is demonstrated by deriving a
total variation preserving discrete pulse decomposition of images.

20
The categories of this paper are: acc-phys
35
The categories of this paper are: mtrl-th
12
The categories of this paper are: nucl-th
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The categories of this paper are: eess
4
The categories of this paper are: cond-mat
16
The categories of this paper are: stat
33
The categories of this paper are: plasm-ph
22
The categories of this paper are: chao-dyn
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The categories of this paper are: dg-ga
11
The categories of this paper are: hep-lat
5
The categories of this paper are: gr-qc
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The categories of this paper are: comp-gas
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The categories of this paper are: cmp-lg
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The categories of this paper are: q-alg
10
The categories of this paper are: q-bio
32
The categories of this paper are: atom-ph