Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Surface Normal Estimation of Tilted Images via Spatial Rectifier   In this paper, we present a spatial rectifier to estimate surface normals of
tilted images. Tilted images are of particular interest as more visual data are
captured by arbitrarily oriented sensors such as body-/robot-mounted cameras.
Existing approaches exhibit bounded performance on predicting surface normals
because they were trained using gravity-aligned images. Our two main hypotheses
are: (1) visual scene layout is indicative of the gravity direction; and (2)
not all surfaces are equally represented by a learned estimator due to the
structured distribution of the training data, thus, there exists a
transformation for each tilted image that is more responsive to the learned
estimator than others. We design a spatial rectifier that is learned to
transform the surface normal distribution of a tilted image to the rectified
one that matches the gravity-aligned training data distribution. Along with the
spatial rectifier, we propose a novel truncated angular loss that offers a
stronger gradient at smaller angular errors and robustness to outliers. The
resulting estimator outperforms the state-of-the-art methods including data
augmentation baselines not only on ScanNet and NYUv2 but also on a new dataset
called Tilt-RGBD that includes considerable roll and pitch camera motion.

14
The categories of this paper are: math-ph
28
The categories of this paper are: alg-geom
29
The categories of this paper are: funct-an
23
The categories of this paper are: solv-int
24
The categories of this paper are: dg-ga
25
The categories of this paper are: patt-sol
34
The categories of this paper are: chem-ph
11
The categories of this paper are: hep-lat
33
The categories of this paper are: plasm-ph
6
The categories of this paper are: astro-ph
27
The categories of this paper are: comp-gas
20
The categories of this paper are: acc-phys
15
The categories of this paper are: nucl-ex
32
The categories of this paper are: atom-ph
18
The categories of this paper are: econ
31
The categories of this paper are: ao-sci