scholarly journals A multivariate intersection over union of SiamRPN network for visual tracking

2021 ◽  
Author(s):  
Zhihui Huang ◽  
Huimin Zhao ◽  
Jin Zhan ◽  
Huakang Li
Keyword(s):  
Aspect Ratio ◽  
Visual Tracking ◽  
Target Location ◽  
Coincidence Degree ◽  
Distance Ratio ◽  
Geometric Factors ◽  
Fast Motion ◽  
Definition Of ◽  
Overlap Area ◽  
Center Distance

AbstractSiamPRN algorithm performs well in visual tracking, but it is easy to drift under occlusion and fast motion scenes because it uses $$\ell _1$$ ℓ 1 -smooth loss function to measure the regression location of bounding box. In this paper, we propose a multivariate intersection over union (MIOU) loss in SiamRPN tracking framework. Firstly, MIOU loss includes three geometric factors in regression: the overlap area ratio, the center distance ratio, and the aspect ratio, which can better reflect the coincidence degree of target box and prediction box. Secondly, we improve the definition of aspect ratio loss to avoid gradient explosion, improve the optimization performance of prediction box. Finally, based on SiamPRN tracker, we compared the tracking performance of $$\ell _1$$ ℓ 1 -smooth loss, IOU loss, GIOU loss, DIOU loss, and MIOU loss. Experimental results show that the MIOU loss has better target location regression than other loss functions on the OTB2015 and VOT2016 benchmark, especially for the challenges of occlusion, illumination change and fast motion.

Search on Method of Netwok Intrusion Detection Based on Support Vector Machine with Pre-Extracting Support Vector

2013 ◽  
Vol 655-657 ◽  
pp. 1787-1790
Author(s):  
Sheng Chen Yu ◽  
Li Min Sun ◽  
Yang Xue ◽  
Hui Guo ◽  
Xiao Ju Wang ◽  
...  
Keyword(s):  
Support Vector Machine ◽  
Intrusion Detection ◽  
Intrusion Detection System ◽  
Detection System ◽  
Detection Algorithm ◽  
Support Vector ◽  
Distance Ratio ◽  
Training Time ◽  
Training Examples ◽  
Center Distance

Intrusion detection algorithm based on support vector machine with pre-extracting support vector is proposed which combines the center distance ratio and classification algorithm. Given proper thresholds, we can use the support vector as a substitute for the training examples. Then the scale of dataset is decreased and the performance of support vector machine is improved in the detection rate and the training time. The experiment result has shown that the intrusion detection system(IDS) based on support vector machine with pre-extracting support needs less training time under the same detection performance condition.

scholarly journals Adaptive Context-Aware and Structural Correlation Filter for Visual Tracking

2019 ◽  
Vol 9 (7) ◽  
pp. 1338 ◽  
Author(s):  
Bin Zhou ◽  
Tuo Wang
Keyword(s):  
Visual Tracking ◽  
High Performance ◽  
State Of The Art ◽  
Correlation Filter ◽  
Context Aware ◽  
Partial Occlusion ◽  
Structural Correlation ◽  
Background Clutter ◽  
Overall Performance ◽  
Fast Motion

Accurate visual tracking is a challenging issue in computer vision. Correlation filter (CF) based methods are sought in visual tracking based on their efficiency and high performance. Nonetheless, traditional CF-based trackers have insufficient context information, and easily drift in scenes of fast motion or background clutter. Moreover, CF-based trackers are sensitive to partial occlusion, which may reduce their overall performance and even lead to failure in tracking challenge. In this paper, we presented an adaptive context-aware (CA) and structural correlation filter for tracking. Firstly, we propose a novel context selecting strategy to obtain negative samples. Secondly, to gain robustness against partial occlusion, we construct a structural correlation filter by learning both the holistic and local models. Finally, we introduce an adaptive updating scheme by using a fluctuation parameter. Extensive comprehensive experiments on object tracking benchmark (OTB)-100 datasets demonstrate that our proposed tracker performs favorably against several state-of-the-art trackers.

Generalizing Prediction of Bluff Body Aerodynamic Load Maps

2015 ◽  
Author(s):  
Sorin Pirau ◽  
Brandon Liberi ◽  
Natasha Barbely ◽  
Narayanan Komerath
Keyword(s):  
Aspect Ratio ◽  
Bluff Body ◽  
Navier Stokes ◽  
Gradual Transition ◽  
Aerodynamic Load ◽  
Rotation Method ◽  
Continuous Rotation ◽  
Rate Effects ◽  
Body Shapes ◽  
Definition Of

The Continuous Rotation method enables efficient definition of all aerodynamic load components on bodies of arbitrary shape for arbitrary attitudes. This is applied to several bluff body shapes including cylinders, a cuboid, a flat plate and a porous box. Rate effects and unsteadiness are shown to be negligible using a cylinder of aspect ratio 1. The genesis of the side force on the yawed cylinder, and the differences between rough and smooth cylinders, are derived from comparisons between experiments and diagnostic computations with an unsteady Navier-Stokes solver. Interpolating Fourier coefficients of the azimuthal load variation appears to be viable to generalize loads on cylinders of varying aspect ratio. A large variation is seen for aspect ratio 0.5 to 1, with a more gradual transition to ‘high aspect ratio’ features beyond aspect ratio 2.

On the definition of design values for loads on silos and tanks

2017 ◽  
Vol 21 (16) ◽  
pp. 2499-2506 ◽  
Author(s):  
Jørgen Nielsen ◽  
J Michael Rotter
Keyword(s):  
Aspect Ratio ◽  
Structural Design ◽  
Structural Engineering ◽  
Reliability Theory ◽  
Wide Range ◽  
Industrial Storage ◽  
Design Values ◽  
Storage Containers ◽  
Definition Of ◽  
Partial Factor

Silos and tanks are both industrial storage containers, so it may be imagined that they can be treated in a common manner for structural design. However, the statistical base of reliability theory shows that tanks are exceptionally invariant in their loading, while loads in silos are possibly the most unpredictable of all structural engineering loads. This article sets out the arguments why the statistical scatter of loads on tanks should be seen as very small indeed. It then treats the problems of loads on silos at length, showing that a wide range of different factors dramatically influence the safety of the structure, leading to a situation in which the use of a single value for the partial factor on stored solid loads could be either very uneconomic or else unsafe. It shows that the known key parameters that define the form of the structure, the aspect ratio, the properties of the stored solids, the manner of filling and discharge, and the frequency of usage of the silo should all play a strong role in determining appropriate values of design partial factors. The recommended values for the partial factors should therefore be evaluated using rules placed in EN 1991-4.

scholarly journals MODELING AND TESTING PROXEMIC BEHAVIOR FOR HUMANOID ROBOTS

2012 ◽  
Vol 09 (04) ◽  
pp. 1250028 ◽  
Author(s):  
ELENA TORTA ◽  
RAYMOND H. CUIJPERS ◽  
JAMES F. JUOLA ◽  
DAVID VAN DER POL
Keyword(s):  
Target Location ◽  
Personal Space ◽  
Humanoid Robots ◽  
Human Robot Interaction ◽  
Bayesian Filtering ◽  
Mathematical Form ◽  
Robot Interaction ◽  
Verbal Interactions ◽  
Definition Of ◽  
Robotic Architecture

Humanoid robots that share the same space with humans need to be socially acceptable and effective as they interact with people. In this paper we focus our attention on the definition of a behavior-based robotic architecture that (1) allows the robot to navigate safely in a cluttered and dynamically changing domestic environment and (2) encodes embodied non-verbal interactions: the robot respects the users personal space (PS) by choosing the appropriate distance and direction of approach. The model of the PS is derived from human–robot interaction tests, and it is described in a convenient mathematical form. The robot's target location is dynamically inferred through the solution of a Bayesian filtering problem. The validation of the overall behavioral architecture shows that the robot is able to exhibit appropriate proxemic behavior.

Aerosol Jet Printer as an Alternative to Wire Bond and TSV Technology for 3D Interconnect Applications

2011 ◽  
Vol 2011 (DPC) ◽  
pp. 001250-001268
Author(s):  
Michael O'Reilly ◽  
Michael J. Renn ◽  
Stephen Barnes
Keyword(s):  
Aspect Ratio ◽  
Integrated Circuits ◽  
High Performance ◽  
3 Dimensional ◽  
Wire Bond ◽  
Printing System ◽  
Performance System ◽  
Definition Of ◽  
Working Distance ◽  
Nanoparticle Ink

Optomec's Aerosol Jet print platform provides an evolutionary alternative to both wire bond and TSV technology, providing high density 3-dimensional interconnect capabilities which enable multi-functional integrated circuits to be stacked and vertically interconnected in high performance System-in-Package (SiP) solutions. The die stacks can include 8 or more die, with a total stack height of ~ 1 mm. The printing system has a working distance of several mm which means that no Z-height adjustments are required for the interconnect printing. Closely coupled pneumatic atomizers with multiplexed print nozzles are used to achieve production throughput of greater than 15,000 interconnects per hour. The Aerosol Jet deposits silver nanoparticle ink connections on staggered multi-chip die stacks. High aspect ratio interconnects with <30-micron line width and 6-micron line heights have been demonstrated at sub 60-micron pitches with resistivity <1x10−7 ohm*m. Pre-production yields exceeding 80% have been consistently realized. This paper will be further expanded to include pre-production qualification results, final production packaging, and further definition of the Aerosol Jet print platform integrated within a high throughput, manufacturing ready automation solution.

The Deformational Behaviour of Low Aspect Ratio Multi-Web Wings

1962 ◽  
Vol 13 (1) ◽  
pp. 71-87 ◽  
Author(s):  
R. H. Gallagher ◽  
I. Rattinger
Keyword(s):  
Experimental Data ◽  
Structural Analysis ◽  
Aspect Ratio ◽  
Subsequent Paper ◽  
Plate Bending ◽  
Restricted Range ◽  
Low Aspect Ratio ◽  
Aspect Ratios ◽  
Influence Coefficients ◽  
Geometric Factors

SummaryResults of a study of the accuracy attainable from various approaches to low aspect ratio wing deformational analyses are described. Seven model multi-web wings, representing a restricted range of sweep angles, aspect ratios and other geometric factors, were tested for deflection influence coefficients; Part I gave experimental data. This paper describes, applies, and compares certain elementary and plate bending theories. A subsequent paper will deal with discrete element idealisations commonly employed in matrix structural analysis.

scholarly journals Visual Tracking Based on Complementary Learners with Distractor Handling

2017 ◽  
Vol 2017 ◽  
pp. 1-13 ◽  
Author(s):  
Suryo Adhi Wibowo ◽  
Hansoo Lee ◽  
Eun Kyeong Kim ◽  
Sungshin Kim
Keyword(s):  
Visual Tracking ◽  
Object Representation ◽  
Target Location ◽  
Target Object ◽  
Tracking Algorithm ◽  
Color Histogram ◽  
Correlation Filter ◽  
Visual Object ◽  
Visual Object Tracking ◽  
Benchmark Datasets

The representation of the object is an important factor in building a robust visual object tracking algorithm. To resolve this problem, complementary learners that use color histogram- and correlation filter-based representation to represent the target object can be used since they each have advantages that can be exploited to compensate the other’s drawback in visual tracking. Further, a tracking algorithm can fail because of the distractor, even when complementary learners have been implemented for the target object representation. In this study, we show that, in order to handle the distractor, first the distractor must be detected by learning the responses from the color-histogram- and correlation-filter-based representation. Then, to determine the target location, we can decide whether the responses from each representation should be merged or only the response from the correlation filter should be used. This decision depends on the result obtained from the distractor detection process. Experiments were performed on the widely used VOT2014 and VOT2015 benchmark datasets. It was verified that our proposed method performs favorably as compared with several state-of-the-art visual tracking algorithms.

Visual Tracking of Active and Passive Movements of the Hand

1980 ◽  
Vol 32 (2) ◽  
pp. 307-315 ◽  
Author(s):  
Jennifer A. Mather ◽  
James R. Lackner
Keyword(s):  
Eye Movement ◽  
Visual Tracking ◽  
Target Location ◽  
Visual Target ◽  
Target Position ◽  
Proprioceptive Information ◽  
Position Information ◽  
Movement Frequency ◽  
Pursuit Movement ◽  
Passive Movements

Two experiments were performed to evaluate the influence of movement frequency and predictability on visual tracking of the actively and the passively moved hand. Four measures of tracking precision were employed: (a) saccades/cycle, (b) percent of pursuit movement, (c) eye amplitude/arm amplitude, (d) asynchrony of eye and hand at reversal. Active and passive limb movements were tracked with nearly identical accuracy and were always vastly superior to tracking an external visual target undergoing comparable motion. Proprioceptive information about target position appears to provide velocity and position information about target location. Its presence permits the development of central eye-movement programmes that move the eyes in patterns that approximate but do not exactly match, temporally or spatially, the motion of the hand.

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