Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Semantics through Time: Semi-supervised Segmentation of Aerial Videos
  with Iterative Label Propagation   Semantic segmentation is a crucial task for robot navigation and safety.
However, current supervised methods require a large amount of pixelwise
annotations to yield accurate results. Labeling is a tedious and time consuming
process that has hampered progress in low altitude UAV applications. This paper
makes an important step towards automatic annotation by introducing SegProp, a
novel iterative flow-based method, with a direct connection to spectral
clustering in space and time, to propagate the semantic labels to frames that
lack human annotations. The labels are further used in semi-supervised learning
scenarios. Motivated by the lack of a large video aerial dataset, we also
introduce Ruralscapes, a new dataset with high resolution (4K) images and
manually-annotated dense labels every 50 frames - the largest of its kind, to
the best of our knowledge. Our novel SegProp automatically annotates the
remaining unlabeled 98% of frames with an accuracy exceeding 90% (F-measure),
significantly outperforming other state-of-the-art label propagation methods.
Moreover, when integrating other methods as modules inside SegProp's iterative
label propagation loop, we achieve a significant boost over the baseline
labels. Finally, we test SegProp in a full semi-supervised setting: we train
several state-of-the-art deep neural networks on the
SegProp-automatically-labeled training frames and test them on completely novel
videos. We convincingly demonstrate, every time, a significant improvement over
the supervised scenario.

26
The categories of this paper are: bayes-an
8
The categories of this paper are: hep-ex
22
The categories of this paper are: chao-dyn
23
The categories of this paper are: solv-int
10
The categories of this paper are: q-bio
4
The categories of this paper are: cond-mat
24
The categories of this paper are: dg-ga
20
The categories of this paper are: acc-phys
30
The categories of this paper are: q-alg
0
The categories of this paper are: hep-ph
27
The categories of this paper are: comp-gas
25
The categories of this paper are: patt-sol
3
The categories of this paper are: physics
35
The categories of this paper are: mtrl-th
9
The categories of this paper are: nlin
34
The categories of this paper are: chem-ph