Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Multifractal wavelet filter of natural images   Natural images are characterized by the multiscaling properties of their
contrast gradient, in addition to their power spectrum. In this work we show
that those properties uniquely define an {\em intrinsic wavelet} and present a
suitable technique to obtain it from an ensemble of images. Once this wavelet
is known, images can be represented as expansions in the associated wavelet
basis. The resulting code has the remarkable properties that it separates
independent features at different resolution level, reducing the redundancy,
and remains essentially unchanged under changes in the power spectrum. The
possible generalization of this representation to other systems is discussed.

16
The categories of this paper are: stat
28
The categories of this paper are: alg-geom
31
The categories of this paper are: ao-sci
10
The categories of this paper are: q-bio
11
The categories of this paper are: hep-lat
32
The categories of this paper are: atom-ph
3
The categories of this paper are: physics
20
The categories of this paper are: acc-phys
29
The categories of this paper are: funct-an
8
The categories of this paper are: hep-ex
34
The categories of this paper are: chem-ph
37
The categories of this paper are: supr-con
13
The categories of this paper are: quant-ph
25
The categories of this paper are: patt-sol
30
The categories of this paper are: q-alg
17
The categories of this paper are: q-fin