Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Tracking Live Fish from Low-Contrast and Low-Frame-Rate Stereo Videos   Non-extractive fish abundance estimation with the aid of visual analysis has
drawn increasing attention. Unstable illumination, ubiquitous noise and low
frame rate video capturing in the underwater environment, however, make
conventional tracking methods unreliable. In this paper, we present a multiple
fish tracking system for low-contrast and low-frame-rate stereo videos with the
use of a trawl-based underwater camera system. An automatic fish segmentation
algorithm overcomes the low-contrast issues by adopting a histogram
backprojection approach on double local-thresholded images to ensure an
accurate segmentation on the fish shape boundaries. Built upon a reliable
feature-based object matching method, a multiple-target tracking algorithm via
a modified Viterbi data association is proposed to overcome the poor motion
continuity and frequent entrance/exit of fish targets under low-frame-rate
scenarios. In addition, a computationally efficient block-matching approach
performs successful stereo matching, which enables an automatic fish-body tail
compensation to greatly reduce segmentation error and allows for an accurate
fish length measurement. Experimental results show that an effective and
reliable tracking performance for multiple live fish with underwater stereo
cameras is achieved.

17
The categories of this paper are: q-fin
18
The categories of this paper are: econ
33
The categories of this paper are: plasm-ph
7
The categories of this paper are: hep-th
15
The categories of this paper are: nucl-ex
37
The categories of this paper are: supr-con
14
The categories of this paper are: math-ph
19
The categories of this paper are: eess
24
The categories of this paper are: dg-ga
12
The categories of this paper are: nucl-th
36
The categories of this paper are: cmp-lg
20
The categories of this paper are: acc-phys
34
The categories of this paper are: chem-ph
25
The categories of this paper are: patt-sol
0
The categories of this paper are: hep-ph
9
The categories of this paper are: nlin