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Trajectory Visibility

Patrick Eades, Ivor van der Hoog, Maarten Löffler, Frank Staals, Susanne Albers
2020 Scandinavian Workshop on Algorithm Theory  
We study the problem of testing whether there exists a time at which two entities moving along different piece-wise linear trajectories among polygonal obstacles are mutually visible.  ...  If the obstacles form a simple polygon, this allows us to answer visibility queries in 𝒪(n³/4log³ n) time using 𝒪(nlog⁵ n) space.  ...  S WAT 2 0 2 0 23:16 Trajectory Visibility 23:18 Trajectory Visibility A Transforming two entites into an algebraic curve.  ... 
doi:10.4230/lipics.swat.2020.23 dblp:conf/swat/EadesHLS20 fatcat:4r64i4izn5gpndfrfztipbbsxi

Trajectory Range Visibility [article]

Seyed Mohammad Hussein Kazemi, Arash Vaezi, Mohammad Ghodsi
2022 arXiv   pre-print
We study the problem of Trajectory Range Visibility, determining the sub-trajectories on which two moving entities become mutually visible.  ...  Namely, given a constant query velocity for a moving entity, we specify all visible parts of the other entity's trajectory and all possible constant velocities of the other entity to become visible.  ...  Trajectories and Visibility Consider trajectories q and r within a simple polygon P.  ... 
arXiv:2209.04013v2 fatcat:ck4gfgpjxveoheoaid7d5i6vfa

Visibility graphs of animal foraging trajectories [article]

Leticia R. Paiva, Sidiney G. Alves, Lucas Lacasa, Og DeSouza, Octavio Miramontes
2022 arXiv   pre-print
In this work, we use visibility graphs -- a method that maps time series into graphs and quantifies the signal complexity via graph topological metrics -- in the context of social insects foraging trajectories  ...  Therefore, Lévy-like trajectories naturally translate into visibility graphs with fat-tailed degree distributions.  ...  Degree distribution function obtained from the visibility graphs of the trajectories obtained by the TF (a and b) and by the Humphries et al. method (c and d).  ... 
arXiv:2204.11690v1 fatcat:qpvcggjpbjd4hiovdhxeguey6y

Maximizing visibility in collaborative trajectory planning

Florian Shkurti, Gregory Dudek
2014 2014 IEEE International Conference on Robotics and Automation (ICRA)  
In this paper we address the issue of coordinating the trajectories of two collaborating robots in environments with obstacles so that visibility between them is maximized in the presence of competing  ...  We discuss connections to the traditional formulation of pursuit-evasion games where the analysis typically ends the moment the evader manages to escape the pursuer's visibility region.  ...  As α goes to infinity, the problem becomes to plan a pair of trajectories that always maintain mutual visibility.  ... 
doi:10.1109/icra.2014.6907405 dblp:conf/icra/ShkurtiD14 fatcat:4atyqahxgfg7rjv45ipigjxvti

Search-based 3D Planning and Trajectory Optimization for Safe Micro Aerial Vehicle Flight Under Sensor Visibility Constraints [article]

Matthias Nieuwenhuisen, Sven Behnke
2019 arXiv   pre-print
We present a combined allocentric complete planning and trajectory optimization approach taking these sensor visibility constraints into account.  ...  Furthermore, the optimized trajectories take the flight dynamics into account and contain the velocities and accelerations along the path.  ...  Fig. 1 . 1 Optimized trajectories without (red) and with visibility constraints (blue).  ... 
arXiv:1903.05165v1 fatcat:4cxhgv37rvfdbkl3pd2nmwxkoi

Joint Measurement and Trajectory Recovery in Visible Light Communication

Dongfang Zheng, Gang Chen, Jay A. Farrell
2017 IEEE Transactions on Control Systems Technology  
The growing preponderance of light emitting diodes (LEDs) for lighting has motivated research into their dual use for visible light communication (VLC) and navigation.  ...  challenging because: 1) clutter and noise corrupt the measurements; 2) the LED status will be OFF in some scans; and 3) the predicted projection location sequence depends on the estimated rover state trajectory  ...  Using visible light to transmit music has been demonstrated in [29] . B.  ... 
doi:10.1109/tcst.2016.2554062 fatcat:3m6n3klxjzesdat4k6bnpqbuqi

Compact Infrared/Visible Laser Transmitter Featuring an Extended Detectable Trajectory

Haeng-In Kim, Hong-Shik Lee, Sang-Shin Lee
2012 Journal of the Optical Society of Korea  
beam in conjunction with a collinear monitoring visible beam.  ...  The angular alignment between the long-range IR and visible beams was as accurate as ~0.5 mrad.  ...  PROPOSED LASER BEAM TRANSMITTER AND ITS DESIGN Our objective is to produce a compact IR beam transmitter, featuring an extended uniform trajectory, which can be monitored by a visible beam.  ... 
doi:10.3807/josk.2012.16.4.331 fatcat:nhamryeoizgx5besr5hxrz5idu

Visible and infrared image registration using trajectories and composite foreground images

G.A. Bilodeau, A. Torabi, F. Morin
2011 Image and Vision Computing  
Registration of infrared and visible color images is performed by using the trajectories of moving objects obtained using background subtraction and simple tracking.  ...  It outperforms a related method only based on trajectory points in cases where there are few moving objects.  ...  (a) and (b) Object trajectories in IR and visible respectively, (c) and (d) Foreground composite image in IR and visible respectively, (e) Registration result 1.  ... 
doi:10.1016/j.imavis.2010.08.002 fatcat:xz6mtxdskzcjto3xmoxkntrtdu

Evaluation of the Visibility of Vessel Movement Features in Trajectory Visualizations

Niels Willems, Huub van de Wetering, Jarke J. van Wijk
2011 Computer graphics forum (Print)  
There are many visualizations that show the trajectory of a moving object to obtain insights in its behavior.  ...  for comparing lanes and finding fast movers is at a similar level as established trajectory visualizations.  ...  V cube is expected to perform best for a small number of trajectories, since the vertical lines in the space-time path tend to be more visible than the small dots in V dens , though for many trajectories  ... 
doi:10.1111/j.1467-8659.2011.01929.x fatcat:b6wujeqfina6tkdrxwxeu6phyi

Fast moving texture has opposite effects on the perceived speed of visible and occluded object trajectories

Luca Battaglini, Giulio Contemori, Marcello Maniglia, Clara Casco
2016 Acta Psychologica  
In Experiment 2, by asking observers to estimate the time-to-contact (TTC) with a bar indicating the end of the invisible trajectory, we showed that this illusory visible speed, due to anti-(iso-) texture  ...  , reduced (increased) the subsequent estimated duration of occluded target trajectory.  ...  Thus, increasing (reducing) the perceived speed during the visible trajectory resulted in a shorter (longer) TTC.  ... 
doi:10.1016/j.actpsy.2016.08.007 pmid:27587358 fatcat:xadx5nypk5bqnbwls4ddgoctey

Determining leaf trajectories for dynamic multileaf collimators with consideration of marker visibility: an algorithm study

B. Zhao, J. Dai
2014 Journal of Radiation Research  
The initial leaf trajectories were generated using a typical leaf-setting algorithm, then the leaf trajectories were adjusted by Delta algorithm operations (analytical computations and a series of matrix  ...  ratio of marker visibility time to beam delivery time).  ...  For the leaf trajectory, I l represents the left leaf trajectory and I r represents the right leaf trajectory.  ... 
doi:10.1093/jrr/rru035 pmid:24914104 pmcid:PMC4202293 fatcat:wzrkvdzabngjhebos4hwzrh7fm

Outage Bridging and Trajectory Recovery in Visible Light Positioning Using Insufficient RSS Information

Ran Zhang, Zichuan Liu, Kemao Qian, Sheng Zhang, Pengfei Du, Chen Chen, Arokiaswami Alphones
2020 IEEE Access  
Efficient algorithms for outage bridging and trajectory recovery are proposed by smartly fusing with insufficient RSS information.  ...  INDEX TERMS Visible light positioning (VLP), recurrent neural network (RNN), received signal strength (RSS), outage bridging, extended Kalman filter (EKF)  ...  His research interests include indoor localization and tracking systems, visible light communication, and positioning.  ... 
doi:10.1109/access.2020.3020874 fatcat:5mlnqqbytbakhnndy4qzi5d5wa

Pitch Accent Trajectories Across Different Conditions of Visibility and Information Structure — Evidence from Spontaneous Dyadic Interaction

Petra Wagner, Nataliya Bryhadyr, Marin Schröer
2019 Interspeech 2019  
Besides varying visibility, the game task allows for measuring the impact of information-structure on pitch accent trajectories, differentiating important and unpredictable game moves.  ...  To investigate whether varying context cues have a differentiated impact on pitch accent trajectories produced in conversational interaction, we modified the visibility conditions in a spontaneous dyadic  ...  A second goal of our study relates to the impact of visible access to contextual information on the f0 trajectories.  ... 
doi:10.21437/interspeech.2019-1619 dblp:conf/interspeech/WagnerBS19 fatcat:kd2cnoism5bjjnfpfmpdgrrx5i

Determination of heights and visible part of meteor trajectory by a graphical method
Určení výšek a viditelné části dráhy meteoru grafickou metodou

Vladimír Guth
1938 Časopis pro pěstování mathematiky a fysiky  
doi:10.21136/cpmf.1938.109452 fatcat:6c5bsl2grveefo2wttq3itduqq

Trajectory specification via sparse waypoints for eye-in-hand robots requiring continuous target visibility

Ambrose Chan, Elizabeth A. Croft, James J. Little
2008 2008 IEEE International Conference on Robotics and Automation  
If no immediately feasible trajectory exists, additional waypoints are specified to guide the robot towards its goal while maintaining visibility.  ...  Virtual imagebased visual servoing (IBVS) is used to generate an ideal image trajectory to guide the selection of waypoints.  ...  Visibility Model Continuous visibility constraints require that the target object remain within the field of view of the camera CCD array throughout the entire robot trajectory.  ... 
doi:10.1109/robot.2008.4543679 dblp:conf/icra/ChanCL08 fatcat:aamyx6kk5rcr7dpusvnlip3cwu
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