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Closed-Loop Tracking and Change Detection in Multi-Activity Sequences

Bi Song, Namrata Vaswani, Amit K. Roy-Chowdhury
2007 2007 IEEE Conference on Computer Vision and Pattern Recognition  
We present a novel framework for tracking of a long sequence of human activities, including the time instances of change from one activity to the next, using a closed-loop, non-linear dynamical feedback  ...  The tracking error or expected log likelihood, which serves as a feedback signal, is used to automatically detect changes and switch between activities happening one after another in a long video sequence  ...  In contrast to this open-loop approach, we propose to use change detection measures (e.g., tracking error/ELL) to detect transitions between activities, and use these as a feedback signal in a closed-loop  ... 
doi:10.1109/cvpr.2007.383243 dblp:conf/cvpr/SongVC07 fatcat:4yyjqubrcbg75dbm4nebmoyfy4

Robust Multi-clue Face Tracking System

Yujia Cao, Xin Wei, Li Zhao, Riccardo Di Federico
2009 2009 WRI Global Congress on Intelligent Systems  
In this paper we present a multi-clue face tracking system, based on the combination of a face detector and two independent trackers.  ...  It initiates the tracking system and updates its state. The trackers, based on 3DRS and optical flow respectively, have been chosen to complement each other in different conditions.  ...  When face can be detected again, the detector will use the tracking result to select the original face out of all the face candidates. In this way, the system "locks" the face in a closed loop.  ... 
doi:10.1109/gcis.2009.207 fatcat:lkup5laeuze3tnkjwir4gfftmy

Rapid Faults Detection for Controlling Multi-terminal High Voltage DC Grids under AC Grid Contingencies

Z. Xu, Zhen Wei, C. Zhang
2016 Energy Procedia  
This paper presents a new faults detection method that is capable of tracking signal deviations on the grid-voltage accurately and rapidly even in the case that bus-voltage contains high order harmonics  ...  To control power flow for integration of distributed energy onto urban power grids, rapid and accurate detection of the amplitude, phase-angle, and frequency offset of the grid voltage's positive and negative  ...  Acknowledgements The authors would like to thank Ningbo Science and Technology Bureau China for the financial support of this very interesting project (2013D10012).  ... 
doi:10.1016/j.egypro.2016.06.053 fatcat:rxpyafha4bfa3i55k4kt5ymnkm

Robust real-time detection, tracking, and pose estimation of faces in video streams

K.S. Huang, M.M. Trivedi
2004 Proceedings of the 17th International Conference on Pattern Recognition, 2004. ICPR 2004.  
We discuss the development of a multi-primitive skin-tone and edge-based detection module embedded in a tracking module for efficient and robust face detection and tracking.  ...  In this paper we present the development of a computational framework for robust detection, tracking, and pose estimation of faces captured by video arrays.  ...  Realtime robust face detection and tracking is achieved by a multi-primitive closed-loop face analysis architecture.  ... 
doi:10.1109/icpr.2004.1334689 dblp:conf/icpr/HuangT04 fatcat:isjstj2cqja67p6r7sr3gwy3di

BonZeb: open-source, modular software tools for high-resolution zebrafish tracking and analysis

Nicholas C Guilbeault, Jordan Guerguiev, Michael Martin, Isabelle Tate, Tod R Thiele
2021 Scientific Reports  
BonZeb supports head-fixed closed-loop and free-swimming virtual open-loop assays as well as multi-animal tracking, optogenetic stimulation, and calcium imaging during behavior.  ...  BonZeb can be implemented into novel and existing Bonsai workflows for online behavioral tracking and offline tracking with batch processing.  ...  A zebrafish strain recently obtained from large breeding ponds in Malaysia was used for free-swimming virtual open-loop and head-fixed closed-loop experiments (6-8 dpf).  ... 
doi:10.1038/s41598-021-85896-x pmid:33854104 pmcid:PMC8047029 fatcat:htljug2wgbh4jg6nwtfjex5hjm

Shunt Active Power Filter Based on Proportional Integral and Multi Vector Resonant Controllers for Compensating Nonlinear Loads

Sen Ye, Youbing Zhang, Luyao Xie, Haiqiang Lu
2018 Journal of Electrical and Computer Engineering  
The current tracking control strategy determines the compensation performance of shunt active power filter (SAPF).  ...  Then the feasibility of the method is demonstrated by analyzing the closed loop frequency characteristics of the system.  ...  In the past years, a lot of research and analysis have been done on the detection and tracking control strategy of the harmonic currents.  ... 
doi:10.1155/2018/1312064 fatcat:gbqcvx6k3ve7zhrvaou4vgyv5a

Integrated Tracking and Recognition of Human Activities in Shape Space [chapter]

Bi Song, Amit K. Roy-Chowdhury, N. Vaswani
2006 Lecture Notes in Computer Science  
The method is able to automatically detect changes and switch between activities happening one after another, which is akin to segmenting a long sequence into homogeneous parts.  ...  The entire process of tracking, recognition, change detection and model switching happens recursively as new video frames become available.  ...  In contrast to this open-loop approach, we propose to use change detection measures to detect slow or sudden transitions between activities, and use these as a feedback signal in a closed-loop system.  ... 
doi:10.1007/11949619_42 fatcat:w7fpjo5zmrcmvk3wgjdge6lnwu

Real-time 6-DOF monocular visual SLAM in a large-scale environment

Hyon Lim, Jongwoo Lim, H. Jin Kim
2014 2014 IEEE International Conference on Robotics and Automation (ICRA)  
(a) From monocular sequences, the proposed method builds 3D map successfully in a large-scale environment.  ...  From a monocular video sequence, the proposed method continuously computes the current 6-DOF camera pose and 3D landmarks position.  ...  Large-scale loop closure detected in sequence #0 of the KITTI dataset. The loop closure is marked in the figure. (a) A frame before the loop closure detection.  ... 
doi:10.1109/icra.2014.6907055 dblp:conf/icra/LimLK14 fatcat:z5xtrrwtdvcqnge5zjxlhqakp4

ORBSLAM-Atlas: a robust and accurate multi-map system [article]

Richard Elvira, Juan D. Tardós, J.M.M. Montiel
2019 arXiv   pre-print
We provide extensive experimental validation in the EuRoC datasets, where ORBSLAM-Atlas obtains accurate monocular and stereo results in the difficult sequences where ORBSLAM failed.  ...  We also build global maps after multiple sessions in the same room, obtaining the best results to date, between 2 and 3 times more accurate than competing multi-map approaches.  ...  When P 2 is reached, the place recognition fires, and the two maps are merged into a single map. At P 3 a loop closing is detected applying the corresponding correction.  ... 
arXiv:1908.11585v1 fatcat:xzl4p4bjsrbu3fpnyz47nwz56m

Harmonic Control for Variable-Frequency Aviation Power System based on Three-level NPC Converter (April 2020)

Zhenyang Hao, Xinying Wang, Xin Cao
2020 IEEE Access  
system; uses the quasi PR controller to track the current, and improves the harmonic suppression effect.  ...  INDEX TERMS Aviation variable frequency power supply, active power filter, frequency detection, harmonic current detection, quasi PR control.  ...  When the harmonic or reactive power changes in the power system, APF can detect the change in time and track the harmonic or reactive current with opposite output direction and equal size.  ... 
doi:10.1109/access.2020.3005192 fatcat:vqsod4yoqjfe5ovx6hg2z2whx4

Mapping indoor environments based on human activity

Slawomir Grzonka, Frederic Dijoux, Andreas Karwath, Wolfram Burgard
2010 2010 IEEE International Conference on Robotics and Automation  
Our approach uses data recorded with a data suit which is equipped with several IMUs to detect movements of a person and door opening and closing events.  ...  In our approach we interpret the movements as motion constraints and door handling events as landmark detections in a graph-based SLAM framework.  ...  We would also like to thank Xsens for providing us with the additional dataset used in the third experiment.  ... 
doi:10.1109/robot.2010.5509976 dblp:conf/icra/GrzonkaDKB10 fatcat:zxjuzk7hrff4tbapx3jkq62pvu

Natural feature tracking for augmented reality

U. Neumann, S. You
1999 IEEE transactions on multimedia  
A multistage tracking algorithm produces accurate motion estimates, and the entire system operates in a closed-loop that stabilizes its performance and accuracy.  ...  We develop robust computer vision methods to detect and track natural features in video images.  ...  We also acknowledge the research members of the AR Tracking Group at the University of Southern California for their assistance and suggestions.  ... 
doi:10.1109/6046.748171 fatcat:ktzwxdkp2jbrjpl4zh4jioiirm

SLAMM: Visual monocular SLAM with continuous mapping using multiple maps

Hayyan Afeef Daoud, Aznul Qalid Md. Sabri, Chu Kiong Loo, Ali Mohammed Mansoor, Antonio Agudo
2018 PLoS ONE  
The initialization is twice as fast as it is in ORB-SLAM, and the retrieved map can reach up to 90 percent more in terms of information preservation depending on tracking loss and loop closure events.  ...  In a single robot scenario the algorithm generates a new map at the time of tracking failure, and later it merges maps at the event of loop closure.  ...  settings, the multi-mapper detected the overlapping portion and merged both sequences in one map.  ... 
doi:10.1371/journal.pone.0195878 pmid:29702697 pmcid:PMC5922523 fatcat:3nvhxsa4rffvvlzydvrhqwjqvu

Static and Dynamic DNA Loops form AP-1-Bound Activation Hubs during Macrophage Development

Douglas H. Phanstiel, Kevin Van Bortle, Damek Spacek, Gaelen T. Hess, Muhammad Saad Shamim, Ido Machol, Michael I. Love, Erez Lieberman Aiden, Michael C. Bassik, Michael P. Snyder
2017 Molecular Cell  
HIGHLIGHTS • High resolution and high sensitivity of loop detection via deeply sequenced in situ Hi-C experiments during monocyte to macrophage differentiation (> 10 billion total reads)  ...  Enhancer-bound loop formation and enhancer-activation of preformed loops represent two distinct modes of regulation that together form multi-loop activation hubs at key macrophage genes.  ...  Selected Gene Ontologies that are enriched in genes at gained (D) and activated (E) loop anchors. Figure 4 : 4 Figure 4: Gained and activated loops form multi-loop multi-enhancer activation hubs.  ... 
doi:10.1016/j.molcel.2017.08.006 pmid:28890333 fatcat:k6bav5clqvhordahh4kaczq7ua

BonZeb: Open-source, modular software tools for high-resolution zebrafish tracking and analysis [article]

Nicholas C Guilbeault, Jordan Guerguiev, Michael Martin, Isabelle Tate, Tod R Thiele
2021 bioRxiv   pre-print
BonZeb supports head-fixed closed-loop and free-swimming virtual open-loop assays as well as multi-animal tracking, optogenetic stimulation, and calcium imaging during behavior.  ...  BonZeb can be implemented into novel and existing Bonsai workflows for online behavioral tracking and offline tracking with batch processing.  ...  activity, we implemented a one-dimensional closed-loop OMR assay during two-photon 200 calcium imaging.  ... 
doi:10.1101/2021.03.02.433632 fatcat:qk6okxtsujfslmjgqsxm3ylr3a
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