Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Trajectory Aligned Features For First Person Action Recognition   Egocentric videos are characterised by their ability to have the first person
view. With the popularity of Google Glass and GoPro, use of egocentric videos
is on the rise. Recognizing action of the wearer from egocentric videos is an
important problem. Unstructured movement of the camera due to natural head
motion of the wearer causes sharp changes in the visual field of the egocentric
camera causing many standard third person action recognition techniques to
perform poorly on such videos. Objects present in the scene and hand gestures
of the wearer are the most important cues for first person action recognition
but are difficult to segment and recognize in an egocentric video. We propose a
novel representation of the first person actions derived from feature
trajectories. The features are simple to compute using standard point tracking
and does not assume segmentation of hand/objects or recognizing object or hand
pose unlike in many previous approaches. We train a bag of words classifier
with the proposed features and report a performance improvement of more than
11% on publicly available datasets. Although not designed for the particular
case, we show that our technique can also recognize wearer's actions when hands
or objects are not visible.

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The categories of this paper are: q-alg
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The categories of this paper are: solv-int
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The categories of this paper are: hep-lat
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The categories of this paper are: econ
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The categories of this paper are: mtrl-th
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The categories of this paper are: stat
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The categories of this paper are: bayes-an
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The categories of this paper are: funct-an
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The categories of this paper are: nucl-ex
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The categories of this paper are: gr-qc
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The categories of this paper are: astro-ph
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The categories of this paper are: acc-phys
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The categories of this paper are: dg-ga
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The categories of this paper are: q-fin
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The categories of this paper are: plasm-ph
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The categories of this paper are: atom-ph