Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Sky Optimization: Semantically aware image processing of skies in
  low-light photography   The sky is a major component of the appearance of a photograph, and its color
and tone can strongly influence the mood of a picture. In nighttime
photography, the sky can also suffer from noise and color artifacts. For this
reason, there is a strong desire to process the sky in isolation from the rest
of the scene to achieve an optimal look. In this work, we propose an automated
method, which can run as a part of a camera pipeline, for creating accurate sky
alpha-masks and using them to improve the appearance of the sky. Our method
performs end-to-end sky optimization in less than half a second per image on a
mobile device. We introduce a method for creating an accurate sky-mask dataset
that is based on partially annotated images that are inpainted and refined by
our modified weighted guided filter. We use this dataset to train a neural
network for semantic sky segmentation. Due to the compute and power constraints
of mobile devices, sky segmentation is performed at a low image resolution. Our
modified weighted guided filter is used for edge-aware upsampling to resize the
alpha-mask to a higher resolution. With this detailed mask we automatically
apply post-processing steps to the sky in isolation, such as automatic
spatially varying white-balance, brightness adjustments, contrast enhancement,
and noise reduction.

37
The categories of this paper are: supr-con
36
The categories of this paper are: cmp-lg
25
The categories of this paper are: patt-sol
22
The categories of this paper are: chao-dyn
23
The categories of this paper are: solv-int
8
The categories of this paper are: hep-ex
17
The categories of this paper are: q-fin
5
The categories of this paper are: gr-qc
24
The categories of this paper are: dg-ga
16
The categories of this paper are: stat
29
The categories of this paper are: funct-an
20
The categories of this paper are: acc-phys
27
The categories of this paper are: comp-gas
33
The categories of this paper are: plasm-ph
15
The categories of this paper are: nucl-ex
10
The categories of this paper are: q-bio