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Dense Optical Flow Field Estimation Using Recursive Lms Filtering

M. Gabbouj, Mejdi Trimeche
2006 Zenodo  
On the other hand, optical flow estimation methods aim to obtain a velocity field using the computation of spatial and temporal image derivatives.  ...  Two different approaches for motion estimation have been separately developed; i. e. image based discrete motion estimation (block matching), and gradient based techniques, or optical flow estimation.  ... 
doi:10.5281/zenodo.52883 fatcat:gyapsi5etrg35bakpfmhfhuvui

Dense Optical Flow Field Estimation Using Recursive Lms Filtering

M. Gabbouj, Mejdi Trimeche
2006 Zenodo  
On the other hand, optical flow estimation methods aim to obtain a velocity field using the computation of spatial and temporal image derivatives.  ...  Two different approaches for motion estimation have been separately developed; i. e. image based discrete motion estimation (block matching), and gradient based techniques, or optical flow estimation.  ... 
doi:10.5281/zenodo.39934 fatcat:wegh3vl52zaulas3mmaztlwyke

Binocular Image Sequence Analysis: Integration of Stereo Disparity and Optic Flow for Improved Obstacle Detection and Tracking

Yingping Huang, Ken Young
2008 EURASIP Journal on Advances in Signal Processing  
The first algorithm is to impose the optic flows as extra constraints for stereo matching.  ...  The second algorithm is to use a Kalman filter as a mixer to combine the distance measurement and the motion displacement measurement for object tracking.  ...  Since true motion fields are not accessible, optical flow representing the displacement of corresponding points in consecutive images is used as an approximation.  ... 
doi:10.1155/2008/843232 fatcat:ejzk64nhmna6xpproxrw3v4weu

Enhancements of SDR-Based FPGA System for V2X-VLC Communications

Lukas Danys, Radek Martinek, Rene Jaros, Jan Baros, Petr Simonik, Vaclav Snasel
2021 Computers Materials & Continua  
recursive least squares (QR-RLS) algorithms.  ...  The best results were achieved using the QR-RLS algorithm.  ...  By using this laser and photodetector, the various power levels were measured as a function of time. This way it could be at least estimated how dense the fog was.  ... 
doi:10.32604/cmc.2021.017333 fatcat:hjwpevzo5remrbhtzjfn2zk7pq

Microscale flow visualization

D. Sinton
2004 Microfluidics and Nanofluidics  
A variety of methods for microscale flow visualization have appeared and evolved since the late 1990s.  ...  Advances in microfluidic and nanofluidic technologies have been paralleled by advances in methods for direct optical measurement of transport phenomena on these scales.  ...  Other advancements have included data filtering (Etoh and Takehara 1995) and recursive techniques (Hart 1998) .  ... 
doi:10.1007/s10404-004-0009-4 fatcat:rzn3nzkpg5fvvec3fdrhehf6ze

Seven tuning schemes for an ADALINE model to predict floor pressures in a subsonic cavity flow

Mehmet Önder Efe, Marco Debiasi, Peng Yan, Hitay Özbay, Mohammad Samimy
2009 Transactions of the Institute of Measurement and Control  
The process under investigation is a subsonic cavity flow system. The experimental data obtained from the system is post-processed to obtain a useful predictor.  ...  Seven algorithms are studied, including the least mean squares (LMS), recursive least squares (RLS), modified Kaczmarz's algorithm (MK), stochastic approximation algorithm (SA), gradient descent (GD),  ...  in Figure 3 to affect the flow field in the test section.  ... 
doi:10.1177/0142331208090964 fatcat:q4bfmhp27zf5pelon77i6njk4e

Stereo Visual Inertial Pose Estimation Based on Feedforward-Feedback Loops [article]

Shengyang Chen, Chih-Yung Wen, Yajing Zou, Wu Chen
2020 arXiv   pre-print
Compared to the widely used filter-based or optimization-based approaches, the pose estimation process is modeled as a control system.  ...  In this paper, we present a novel stereo visual inertial pose estimation method.  ...  This is used to track the features between stereo images with the Lucas-Kanade optical flow [36] and then to triangulate tracked point pairs [37] .  ... 
arXiv:2007.02250v2 fatcat:ybk222u5s5dbzcumc3wugi6mri

Basics and principles of particle image velocimetry (PIV) for mapping biogenic and biologically relevant flows

Eize J. Stamhuis
2006 Aquatic Ecology  
Acknowledgements Jan Drent assisted in recording of the bivalve flow fields, Michiel Vos recorded the barnacle flow fields, Sandra Nauwelaerts recorded the vortex ring flow fields (cooperation with the  ...  University of Antwerp), Luca van Duren and Per Jonson are acknowledged for the invitation to the BIO-FLOW-2002 symposium.  ...  This prevents the implementation of 'repair' routines such as windowoffsetting in which a first FFT-cycle is used to get a first estimate of the particle displacement and a second cycle at the estimated  ... 
doi:10.1007/s10452-005-6567-z fatcat:dhlfy3jzkveerpzzir3ouy2sxy

PEDESTRIAN DETECTION BY LASER SCANNING AND DEPTH IMAGERY

A. Barsi, T. Lovas, B. Molnar, A. Somogyi, Z. Igazvolgyi
2016 The International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences  
Pedestrian flow is much less regulated and controlled compared to vehicle traffic. Estimating flow parameters would support many safety, security or commercial applications.  ...  The paper includes accuracy analysis of the estimated parameters based on video footage as reference.  ...  (Gate and Nashashibi, 2008) have improved the pedestrian classification accuracy by recursive estimation. (Kisfaludi, 2004) used security camera images to detect pedestrian passing.  ... 
doi:10.5194/isprsarchives-xli-b3-465-2016 fatcat:355fbzjrbfbmxp4m7v2n36tznu

Application Challenges from a Bird's-Eye View [chapter]

Davide Scaramuzza
2017 Computer Vision in Vehicle Technology  
Computer Vision in Vehicle Technology focuses on computer vision as on-board technology, bringing together fields of research where computer vision is progressively penetrating: the automotive sector,  ...  canyon by balancing the optical flow on both sides of the robot field of view).  ...  Image points are triangulated from multiple views using recursive Bayesian estimation.  ... 
doi:10.1002/9781118868065.ch6 fatcat:fsljmro5izhh5mp4z3hcrgstby

PEDESTRIAN DETECTION BY LASER SCANNING AND DEPTH IMAGERY

A. Barsi, T. Lovas, B. Molnar, A. Somogyi, Z. Igazvolgyi
2016 The International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences  
Pedestrian flow is much less regulated and controlled compared to vehicle traffic. Estimating flow parameters would support many safety, security or commercial applications.  ...  The paper includes accuracy analysis of the estimated parameters based on video footage as reference.  ...  (Gate and Nashashibi, 2008) have improved the pedestrian classification accuracy by recursive estimation. (Kisfaludi, 2004) used security camera images to detect pedestrian passing.  ... 
doi:10.5194/isprs-archives-xli-b3-465-2016 fatcat:awmzkuj2nndn3fq2bsktenj4he

Nonlinear compensation for indoor visible light communication systems with carrierless amplitude and phase modulation

Ming Che, Takeshi Kuboki, Kazutoshi Kato
2019 Japanese Journal of Applied Physics  
In fact, there are several algorithms which can update weights adaptively, such as LMS equalization and recursive least squares (RLS) equalization.  ...  A current will flow through the LED when an external voltage greater than the threshold voltage.  ... 
doi:10.7567/1347-4065/ab1fd8 fatcat:bitjskszn5c4zkqmru6bssvjhy

Towards an automatic parking system using bio-inspired 1-D optical flow sensors

Stefano Mafrica, Alain Servel, Franck Ruffier
2015 2015 IEEE International Conference on Vehicular Electronics and Safety (ICVES)  
We therefore investigated how Local Motion Sensors (LMSs) [13], [14] , comprising only of a few pixels giving 1-D optical flow (OF) measurements could be used to improve automatic parking maneuvers.  ...  The algorithm used was composed of 5 processing steps, which will be described here in detail.  ...  By measuring this time lag, the optical flow can be computed as follows: ω(t) = ∆ϕ τ (t) [22] .  ... 
doi:10.1109/icves.2015.7396901 dblp:conf/icves/MafricaSR15 fatcat:krgc67sswbat7c6dx75gvhrvqu

Improved Dynamic Obstacle Mapping (iDOMap)

Ángel Llamazares, Eduardo Molinos, Manuel Ocaña, Vladimir Ivan
2020 Sensors  
The DOMap has been extended in three key points: first the LIDAR reflectivity remission is used to make more robust the matching in the optical flow of the detection stage, secondly static and a dynamic  ...  occlusion detectors have been proposed, and finally a tracking stage based on Particle Filter (PF) has been used to deal with robots and people as dynamic obstacles.  ...  detect the obstacles positions and (2) a method to estimate the velocity of these obstacles using a tracking stage based on optical flow and a detection stage based on blob filtering.  ... 
doi:10.3390/s20195520 pmid:32993193 fatcat:a3jel7ttrra6nlwkwklpsk6qgu

A comparative study of changes in the Lambert Glacier/Amery Ice Shelf system, East Antarctica, during 2004–2008 using gravity and surface elevation observations

HUAN XIE, RONGXING LI, XIAOHUA TONG, XIAOLEI JU, JUN LIU, YUNZHONG SHEN, LEI CHEN, SHIJIE LIU, BO SUN, XIANGBIN CUI, YIXIANG TIAN, WENKAI YE
2016 Journal of Glaciology  
In many high flow-speed glacier areas, negative mass change rates may be caused by dynamic ice flow discharges that have surpassed the snow accumulation.  ...  In the high-elevation inland region, a positive trend was estimated from both ICESat and GRACE data, which is in line with the CHINARE accumulation measurements.  ...  using a Fan filter instead of a Gaussian filter.  ... 
doi:10.1017/jog.2016.76 fatcat:bdwzqzarabedlc6am5jo5sah7y
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