Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Intensity-corrected 4D light-in-flight imaging   Light-in-flight (LIF) imaging is the measurement and reconstruction of
light's path as it moves and interacts with objects. It is well known that
relativistic effects can result in apparent velocities that differ
significantly from the speed of light. However, less well known is that
Rayleigh scattering and the effects of imaging optics can lead to observed
intensities changing by several orders of magnitude along light's path. We
develop a model that enables us to correct for all of these effects, thus we
can accurately invert the observed data and reconstruct the true
intensity-corrected optical path of a laser pulse as it travels in air. We
demonstrate the validity of our model by observing the photon arrival time and
intensity distribution obtained from single-photon avalanche detector (SPAD)
array data for a laser pulse propagating towards and away from the camera. We
can then reconstruct the true intensity-corrected path of the light in four
dimensions (three spatial dimensions and time).

34
The categories of this paper are: chem-ph
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
11
The categories of this paper are: hep-lat
31
The categories of this paper are: ao-sci
13
The categories of this paper are: quant-ph
8
The categories of this paper are: hep-ex
29
The categories of this paper are: funct-an
25
The categories of this paper are: patt-sol
15
The categories of this paper are: nucl-ex
19
The categories of this paper are: eess
14
The categories of this paper are: math-ph
7
The categories of this paper are: hep-th
22
The categories of this paper are: chao-dyn
36
The categories of this paper are: cmp-lg