2,948 research outputs found
Distance to Center of Mass Encoding for Instance Segmentation
The instance segmentation can be considered an extension of the object
detection problem where bounding boxes are replaced by object contours.
Strictly speaking the problem requires to identify each pixel instance and
class independently of the artifice used for this mean. The advantage of
instance segmentation over the usual object detection lies in the precise
delineation of objects improving object localization. Additionally, object
contours allow the evaluation of partial occlusion with basic image processing
algorithms. This work approaches the instance segmentation problem as an
annotation problem and presents a novel technique to encode and decode ground
truth annotations. We propose a mathematical representation of instances that
any deep semantic segmentation model can learn and generalize. Each individual
instance is represented by a center of mass and a field of vectors pointing to
it. This encoding technique has been denominated Distance to Center of Mass
Encoding (DCME)
Free space laser telecommunication through fog
Atmospheric clearness is a key issue for free space optical communications
(FSO). We present the first active method to achieve FSO through clouds and
fog, using ultrashort high intensity laser filaments. The laser filaments
opto-mechanically expel the droplets out of the beam and create a cleared
channel for transmitting high bit rate telecom data at 1.55 microns. The low
energy required for the process allows considering applications to
Earth-satellite FSO and secure ground based optical communication, with
classical or quantum protocols.Comment: 4 pages + 2 pages supplementary text and movie
A Linear Sigma Model with Three Flavors and Vector and Axial-Vector Mesons
We outline the extension of the globally chirally invariant Nf = 2 linear
sigma model with vector and axial-vector degrees of freedom to Nf=3. We present
preliminary results concerning the scalar meson masses.Comment: Prepared for the Proceedings of the 11th International Workshop on
Meson Production, Properties and Interaction (MESON 2010), in Krakow, Poland,
10-15 June 2010. Three page
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