Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Adaptive nonparametric detection in cryo-electron microscopy   Cryo-electron microscopy (cryo-EM) is an emerging experimental method to
characterize the structure of large biomolecular assemblies. Single particle
cryo-EM records 2D images (so-called micrographs) of projections of the
three-dimensional particle, which need to be processed to obtain the
three-dimensional reconstruction. A crucial step in the reconstruction process
is particle picking which involves detection of particles in noisy 2D
micrographs with low signal-to-noise ratios of typically 1:10 or even lower.
Typically, each picture contains a large number of particles, and particles
have unknown irregular and nonconvex shapes.

25
The categories of this paper are: patt-sol
22
The categories of this paper are: chao-dyn
2
The categories of this paper are: math
12
The categories of this paper are: nucl-th
31
The categories of this paper are: ao-sci
28
The categories of this paper are: alg-geom
20
The categories of this paper are: acc-phys
23
The categories of this paper are: solv-int
5
The categories of this paper are: gr-qc
6
The categories of this paper are: astro-ph
33
The categories of this paper are: plasm-ph
27
The categories of this paper are: comp-gas
18
The categories of this paper are: econ
32
The categories of this paper are: atom-ph
3
The categories of this paper are: physics
36
The categories of this paper are: cmp-lg