scholarly journals Detecting Micro-Expressions in Real Time Using High-Speed Video Sequences

2019 ◽  
Author(s):  
Radu Danescu ◽  
Diana Borza ◽  
Razvan Itu
Keyword(s):  
Real Time ◽  
High Speed ◽  
Video Sequences ◽  
High Speed Video

Real-time temporal shaping of high-speed video streams

2010 ◽  
Vol 34 (5) ◽  
pp. 575-584 ◽  
Author(s):  
Martin Fuchs ◽  
Tongbo Chen ◽  
Oliver Wang ◽  
Ramesh Raskar ◽  
Hans-Peter Seidel ◽  
...  
Keyword(s):  
Real Time ◽  
High Speed ◽  
Video Streams ◽  
High Speed Video

Visual Tracking of Box Jellyfish

2015 ◽  
pp. 107-122 ◽  
Author(s):  
Magnus Oskarsson ◽  
Tobias Kjellberg ◽  
Tobias Palmér ◽  
Dan-Eric Nilsson ◽  
Kalle Åström
Keyword(s):  
High Speed ◽  
Motor Response ◽  
Building Blocks ◽  
Video Sequences ◽  
Special Test ◽  
Real Time System ◽  
Test Setup ◽  
Box Jellyfish ◽  
High Speed Video ◽  
Sensory Structures

In this chapter a system for tracking the motion of box jellyfish Tripedalia cystophora in a special test setup is investigated. The goal is to measure the motor response of the animal given certain visual stimuli. The approach is based on tracking the special sensory structures - the rhopalia - of the box jellyfish from high-speed video sequences. The focus has been on a real-time system with simple building blocks in the system. However, using a combination of simple intensity based detection and model based tracking promising tracking results with up to 95% accuracy are achieved.

Tracking Whisker and Head Movements in Unrestrained Behaving Rodents

2005 ◽  
Vol 93 (4) ◽  
pp. 2294-2301 ◽  
Author(s):  
Per Magne Knutsen ◽  
Dori Derdikman ◽  
Ehud Ahissar
Keyword(s):  
Real Time ◽  
Efficient Method ◽  
Exploratory Behavior ◽  
High Speed ◽  
Head Movements ◽  
Behavioral Data ◽  
High Speed Video ◽  
Electrophysiological Recordings ◽  
Freely Moving ◽  
Mystacial Vibrissae

Due to recent advances that enable real-time electrophysiological recordings in brains of awake behaving rodents, effective methods for analyzing the large amount of behavioral data thus generated, at millisecond resolution, are required. We describe a semiautomated, efficient method for accurate tracking of head and mystacial vibrissae (whisker) movements in freely moving rodents using high-speed video. By tracking the entire length of individual whiskers, we show how both location and shape of whiskers are relevant when describing the kinematics of whisker movements and whisker interactions with objects during a whisker-dependent task and exploratory behavior.

scholarly journals Influence of liquid properties on ultrasonic atomization

2017 ◽  
Author(s):  
Antonio Lozano ◽  
Juan Antonio García ◽  
Javier Alconchel ◽  
Félix Barreras ◽  
Esteban Calvo ◽  
...  
Keyword(s):  
Surface Tension ◽  
Weight Loss ◽  
Vapor Pressure ◽  
High Speed ◽  
Liquid Surface ◽  
Video Sequences ◽  
Narrow Size Distribution ◽  
Piezoceramic Disk ◽  
Ultrasonic Atomization ◽  
High Speed Video

Ultrasonic atomization is very convenient because it can generate droplets with diameters of a few microns andwith very narrow size distribution. Besides, opposite to twin fluid nozzles, in ultrasonic atomization, dropletgeneration and transport are decoupled processes. Droplets are ejected from the liquid surface with very lowvelocities, so driving them is relatively simple. Although this atomization method is now common in some specificapplications, for example in household humidifiers, there are still some details about the physics of this processthat are not completely understood. Up to date, most of the published results have been limited to experimentswith water. However, it has been demonstrated that atomization rates quickly decrease as liquid viscosityincreases. This work analyzes the characteristics of ultrasonic atomization of some alternative fluids to determineif there is any influence of other physical properties such as surface tension or vapor pressure. Experiments areperformed using a commercial piezoceramic disk with a resonance frequency of 1.65 MHz. The disk is excitedwith a sinusoidal signal with voltage amplitudes that go up to 60 V. Sprays are visually characterized analyzinginstantaneous images and high speed video sequences. Besides atomization rates are calculated by measuringthe weight loss in a fixed time.DOI: http://dx.doi.org/10.4995/ILASS2017.2017.4588

scholarly journals Perforation of Double-Spaced Aluminum Plates by Reactive Projectiles with Different Densities

Materials ◽  
2021 ◽  
Vol 14 (5) ◽  
pp. 1229
Author(s):  
Hao Zhang ◽  
Haifu Wang ◽  
Qingbo Yu ◽  
Yuanfeng Zheng ◽  
Guancheng Lu ◽  
...  
Keyword(s):  
Theoretical Prediction ◽  
Initial Velocity ◽  
High Speed ◽  
Spray Angle ◽  
Video Sequences ◽  
Material Density ◽  
High Speed Video ◽  
Front Plate ◽  
Critical Velocities ◽  
Aluminum Plates

Perforation behavior of 3 mm/3 mm double-spaced aluminum plates by PTFE/Al/W (Polytetrafluoroethylene/Aluminum/Tungsten) reactive projectiles with densities ranging from 2.27 to 7.80 g/cm3 was studied experimentally and theoretically. Ballistic experiments show that the failure mode of the front plate transforms from petalling failure to plugging failure as projectile density increases. Theoretical prediction of the critical velocities for the reactive projectiles perforating the double-spaced plates is proposed, which is consistent with the experimental results and well represents the perforation performance of the projectiles. Dimensionless formulae for estimating the perforation diameter and deflection height of the front plates are obtained through dimensional analysis, indicating material density and strength are dominant factors to determine the perforation size. High-speed video sequences of the perforation process demonstrate that high-density reactive projectiles make greater damage to the rear plates because of the generation of projectile debris streams. Specifically, the maximum spray angle of the debris streams and the crater number in the debris concentration area of the rear plate both increase with the projectile density and initial velocity.

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