scholarly journals Motility analysis by means of video tracked markers

2018 ◽  
Vol 4 (1) ◽  
pp. 341-344 ◽  
Author(s):  
Kornelius Lente ◽  
Karin H. Somerlik-Fuchs ◽  
Jonas Friedrich Schiemer ◽  
Axel Heimann ◽  
Roman Ruff ◽  
...  
Keyword(s):  
Gastrointestinal Tract ◽  
Research Study ◽  
Severe Disease ◽  
Video Camera ◽  
Video Data ◽  
Marker Position ◽  
Disease Pattern ◽  
Previous Frame ◽  
Advanced Analysis ◽  
Electromyography Signals

AbstractThe motility of the gastrointestinal tract is crucial for digestive activity and dysfunction can lead to severe disease pattern. A method for analysing the motility is needed when treatment approaches shall be evaluated. Therefore markers attached to different locations on the stomach and the bowel of pigs are video tracked in this research study. The markers are designed to provide a high contrast and have an adhesive side for fixation. Above the operation field a video camera has been placed to film the markers during the procedure. To analyse the video data a special algorithm has been implemented. The algorithm requires a registration process at the beginning of each recording which allows the parallel tracking of multiple markers. After the registration the algorithm tracks the position of the marker frame by frame. Each frame is converted into a greyscale picture by adding specified colour values of each pixel. This allows emphasizing certain colours. The centre of the marker is determined by computing the horizontal and vertical centre of the marker starting at the corresponding marker position of the previous frame. After completion the data is stored as coordinates and a video with the marker position displayed for further processing. For advanced analysis the data can be synchronized with electromyography signals, for example. The marked videos show a promising tracking of the markers. However, if the algorithm loses track of a marker during a recording, it is unlikely to relocate it due to the successive processing of the frames. Nevertheless this method provides a simple and easy to use solution for movement detection of the gastrointestinal tract.

Analysis of Pedestrian Hybrid Beacon Operation on Higher-Speed Roadways

2020 ◽  
Vol 2674 (5) ◽  
pp. 22-32
Author(s):  
Kay Fitzpatrick ◽  
Michael J. Cynecki ◽  
Michael P. Pratt ◽  
Michelle Beckley
Keyword(s):  
Traffic Control ◽  
Research Study ◽  
Video Camera ◽  
Control Device ◽  
Study Data ◽  
Video Data ◽  
Operating Speed ◽  
Department Of Transportation ◽  
Control Devices ◽  
Transportation Research

The pedestrian hybrid beacon (PHB) is a traffic control device used at pedestrian crossings. It was first included in the 2009 Manual on Uniform Traffic Control Devices and was based on the HAWK developed in Tucson, Arizona. The focus of an Arizona Department of Transportation research study was the investigation of the use of PHBs on higher-speed roads. Ten locations in Arizona representing higher operating speed conditions (85th percentile speed ranging from 44 to 54 mph) were selected for inclusion in this study. Data were collected using a multiple video camera setup. The final dataset reflected about 40 h of video data and included 1,214 pedestrians or cyclists crossing at PHBs. Overall, driver yielding for these 10 sites averaged 97%, which is similar to driver-yielding rates for PHBs installed on lower-speed streets.

scholarly journals EYE-C: Eye-Contact Robust Detection and Analysis during Unconstrained Child-Therapist Interactions in the Clinical Setting of Autism Spectrum Disorders

2021 ◽  
Vol 11 (12) ◽  
pp. 1555
Author(s):  
Gianpaolo Alvari ◽  
Luca Coviello ◽  
Cesare Furlanello
Keyword(s):  
Clinical Sample ◽  
Eye Contact ◽  
Video Camera ◽  
Autism Spectrum ◽  
Individual Characteristics ◽  
Video Data ◽  
Contact Dynamics ◽  
Treatment Programs ◽  
Robust Detection ◽  
High Level

The high level of heterogeneity in Autism Spectrum Disorder (ASD) and the lack of systematic measurements complicate predicting outcomes of early intervention and the identification of better-tailored treatment programs. Computational phenotyping may assist therapists in monitoring child behavior through quantitative measures and personalizing the intervention based on individual characteristics; still, real-world behavioral analysis is an ongoing challenge. For this purpose, we designed EYE-C, a system based on OpenPose and Gaze360 for fine-grained analysis of eye-contact episodes in unconstrained therapist-child interactions via a single video camera. The model was validated on video data varying in resolution and setting, achieving promising performance. We further tested EYE-C on a clinical sample of 62 preschoolers with ASD for spectrum stratification based on eye-contact features and age. By unsupervised clustering, three distinct sub-groups were identified, differentiated by eye-contact dynamics and a specific clinical phenotype. Overall, this study highlights the potential of Artificial Intelligence in categorizing atypical behavior and providing translational solutions that might assist clinical practice.

A testudinid herpesvirus 1 (TeHV1)-associated disease outbreak in a group of Horsfield’s tortoises (Testudo horsfieldii)

2021 ◽  
Vol 49 (06) ◽  
pp. 462-467
Author(s):  
Lisa Schüler ◽  
Pierre Picquet ◽  
Christoph Leineweber ◽  
Janosch Dietz ◽  
Elisabeth Müller ◽  
...  
Keyword(s):  
Gastrointestinal Tract ◽  
Histological Examination ◽  
Inclusion Bodies ◽  
Severe Disease ◽  
Disease Outbreak ◽  
High Morbidity ◽  
Intranuclear Inclusion ◽  
Upper Respiratory ◽  
Herpesvirus 1 ◽  
Mycoplasma Spp

AbstractIn spring 2020, a severe disease outbreak with high morbidity and mortality was observed in a collection of 15 Horsfield’s tortoises (Testudo horsfieldii). Affected tortoises showed upper respiratory- and gastrointestinal tract signs, including rhinitis and stomatitis. Testudinid herpesvirus 1 (TeHV1) and Mycoplasma spp. were detected by PCR in oral swabs of affected animals. Histological examination of one deceased animal showed intranuclear inclusion bodies typical for herpesvirus infections in liver, spleen and oesophagus. The virus was likely introduced into the collection 2 years earlier by a clinically healthy Horsfield’s tortoise that was tested positive for TeHV1 by PCR.

scholarly journals Application of Shore-Based Video and Unmanned Aerial Vehicles (Drones): Complementary Tools for Beach Studies

2020 ◽  
Vol 12 (3) ◽  
pp. 394 ◽  
Author(s):  
Donatus Bapentire Angnuureng ◽  
Philip-Neri Jayson-Quashigah ◽  
Rafael Almar ◽  
Thomas Christian Stieglitz ◽  
Edward Jamal Anthony ◽  
...  
Keyword(s):  
Low Cost ◽  
Video Camera ◽  
Video Data ◽  
Camera System ◽  
Camera Systems ◽  
Camera View ◽  
Aerial Vehicle ◽  
One Year ◽  
Video Camera System ◽  
Good Agreement

Video camera systems have been used over nearly three decades to monitor coastal dynamics. They facilitate a high-frequency analysis of spatiotemporal shoreline mobility. Video camera usage to measure beach intertidal profile evolution has not been standardized globally and the capacity to obtain accurate results requires authentication using various techniques. Applications are mostly site specific due to differences in installation. The present study examines the accuracy of intertidal topographic data derived from a video camera system compared to data acquired with unmanned aerial vehicle (UAV, or drone) surveys of a reflective beach. Using one year of 15-min video data and one year of monthly UAV observations, the intertidal profile shows a good agreement. Underestimations of intertidal profile elevations by the camera-based method are possibly linked to the camera view angle, rectification and gaps in data. The resolution of the video-derived intertidal topographic profiles confirmed, however, the suitability of the method in providing beach mobility surveys matching those required for a quantitative analysis of nearshore changes. Beach slopes were found to vary between 0.1 and 0.7, with a steep slope in May to July 2018 and a gentle slope in December 2018. Large but short-scale beach variations occurred between August 2018 and October 2018 and corresponded to relatively high wave events. In one year, this dynamic beach lost 7 m. At this rate, and as also observed at other beaches nearby, important coastal facilities and infrastructure will be prone to erosion. The data suggest that a low-cost shore-based camera, particularly when used in a network along the coast, can produce profile data for effective coastal management in West Africa and elsewhere.

scholarly journals Correlation between the Amount of Anti-D Antibodies and IgG Subclasses with Severity of Haemolytic Disease of Foetus and Newborn

2015 ◽  
Vol 3 (2) ◽  
pp. 293-297 ◽  
Author(s):  
Emilija Velkova
Keyword(s):  
Prospective Studies ◽  
Predictive Value ◽  
Research Study ◽  
Severe Disease ◽  
Foetal Death ◽  
Hemolytic Disease ◽  
Haemolytic Disease ◽  
A Value ◽  
Weak Intensity ◽  
Study Results

AIM: The aim of this study was to investigate the influence of subclasses to IgG anti-D on the intensity of hemolytic disease of fetus and newborn (HDFN) at 45 fetuses/newborns with symptoms of mild and severe HDFN in Republic of Macedonia.MATERIAL AND METHODS: In retrospective and prospective studies, in a period of 10 years, from 2004 to 2014, there have been immunohemathology tests performed on 22 009 samples on serums of pregnant women.RESULTS: At 37.78% of the total number of tested patients, IgG1 and IgG3 was the reason for severe HDFN. At 17.77% of the total number of tested patients, which had only IgG1detected, was the reason for serious intensity of HDFN. The correlation of the titer to anti-D antibodies in the mother’s serum and the intensity of HDFN were researched in 48 newborns. The titers between 1:8 and 1:32 resulted in 3 cases of HDFN with symptoms of severe disease and in 4 cases there were no signs of HDFN. At 12 women that had a titre between 1:32 and 1:512, five of the newborns developed severe HDFN, and seven had symptoms of mild and weak intensity form. In 3 cases the titer was higher than 512, and out of them one newborn had weak symptoms of HDFN, one developed severe HDFN and one ended with foetal death. Only in one case the titer reached a value higher than 1000, and it ended with a fetal death.CONCLUSIONS: The titers of the pregnant women serum those are lower than 32 and those higher than 1000 can well predict HDFN. The titers of anti-D antibodies between 64 and 512 have no exact predictive value. IgG1 and IgG3 subclasses of anti-D have no predictive value by themselves, and cannot foresee the outcome of HDFN. The research study results suggest that IgG1 and IgG3 should be included in a multi – parameter protocol for evaluation of the HDFN intensity. They can give a real assessment of the expected HDFN intensity in combination with the titer hight and the significance of the antibodies.

scholarly journals Determination of areal surface-feature coverage in the Beaufort Sea using aircraft video data

1997 ◽  
Vol 25 ◽  
pp. 434-438 ◽  
Author(s):  
Mark A. Tschudi ◽  
Judith A. Curry ◽  
James A. Maslanik
Keyword(s):  
Sea Ice ◽  
Open Water ◽  
Video Camera ◽  
Surface Feature ◽  
Video Data ◽  
Surface Energy Budget ◽  
The Arctic ◽  
Areal Coverage ◽  
Melt Ponds

The surface-energy budget of the Arctic Ocean depends on the distribution of various sea-ice features that form by both mechanical and thermodynamic processes. Melt ponds, new ice and open water greatly affect the determination of surface albedo. However, even basic measurements of some surface-feature characteristics, such as areal extent of melt ponds, remain rare.A method has been developed to assess the areal coverage of melt ponds, new ice and open water using video data from the Beaufort and Arctic Storms Experiment (BASE). A downward-looking video camera mounted on the underside of a Hercules C-130 aircraft provided clear images of the surface. Images acquired over multi-year ice on 21 September 1994 were analyzed using a spectral technique to determine the areal coverage of melt ponds, new ice and open water. Statistics from this analysis were then compared to previous field studies and to the Schramm and others (in press) sea-ice model.

Braking Response Times for 100 Drivers in the Avoidance of an Unexpected Obstacle as Measured in a Driving Simulator

1996 ◽  
Vol 40 (18) ◽  
pp. 900-904 ◽  
Author(s):  
Nancy L. Broen ◽  
Dean P. Chiang
Keyword(s):  
Standard Deviation ◽  
Response Time ◽  
Driving Simulator ◽  
Response Times ◽  
Video Camera ◽  
Video Data ◽  
Location Information ◽  
Accelerator Pedal ◽  
Shoe Size ◽  
Dynamic Research

This study examined the effect of brake and accelerator pedal configuration on braking response time to an unexpected obstacle. One hundred subjects drove in the Dynamic Research, Inc, (DRI) Interactive Driving Simulator through a simulated neighborhood 21 times, each time with a different pedal configuration. Each subject was presented with an unexpected obstacle only one time, for one of three previously selected pedal configurations, to which he or she was instructed to brake as quickly as possible. Foot movements were recorded with a video camera mounted above the pedals. Data were analyzed manually, using time and course location information superimposed on the video data. Response times were analyzed using ANOVA to determine effects of pedal configuration and various driver factors. Response times ranged from 0.81 sec to 2.44 sec with a mean of 1.33 sec and a standard deviation of 0.27 sec. There was no significant effect of pedal configuration on response time. Driver age was significant, with increased age corresponding to increased response time. Car normally driven, gender, driver height, and shoe size had no significant effect.

scholarly journals Interferometric radar observations of filamented structures due to plasma instabilities and their relation to dynamic auroral rays

2004 ◽  
Vol 22 (4) ◽  
pp. 1115-1132 ◽  
Author(s):  
T. Grydeland ◽  
E. M. Blixt ◽  
U. P. Løvhaug ◽  
T. Hagfors ◽  
C. La Hoz ◽  
...  
Keyword(s):  
Video Camera ◽  
Initial Study ◽  
Video Data ◽  
Marginal Stability ◽  
Time Variability ◽  
Clear Correlation ◽  
Radio Science ◽  
Auroral Activity ◽  
Ionosphere Plasma ◽  
Ion Acoustic

Abstract. Several explanations have been proposed for Naturally Enhanced ion-acoustic Echoes observed at mid- and high-latitude Incoherent Scatter observatories. A decisive measure for distinguishing between these explanations is whether or not simultaneously observed up- and down-shifted enhancement occur simultaneously, or if they are the result of temporal and/or spatial averaging. The EISCAT Svalbard Radar has two antennas in the same radar system, which can be used as an interferometer when pointed parallel. In observations from 17 January 2002, between 06:46:10 and 06:46:30 UT, we used this possibility, in combination with direct sampling of the received signals, to yield measurements of "naturally enhanced ion-acoustic echoes" with sufficiently high resolution to resolve such averaging, if any. For the first time, radar interferometry has been employed to estimate the sizes of coherent structures. The observations were coordinated with an image intensified video camera with a narrow field of view. Together, this forms the initial study on the causal relationships between enhanced echoes and fine structure in the auroral activity on sub-kilometer, sub-second scales. The results confirm that the enhanced echoes originate from very localised regions (~300m perpendicular to the magnetic field at 500km altitude) with varying range distribution, and with high time variability (≈200ms). The corresponding increase in scattering cross section, up to 50dB above incoherent scattering, eliminates theoretical explanations based on marginal stability. The simultaneously observed up- and down-shifted enhanced shoulders, when caused by sufficiently narrow structures to be detected by the interferometer technique, originate predominantly from the same volume. These results have significant impact on theories attempting to explain the enhancements, in particular it is found that the ion-electron two-stream mechanism favoured by many authors is an unlikely candidate to explain the observations. The video data has helped establish a clear correlation between the enhanced echoes and auroral activity, on sub-second time scales, showing a threshold connection between the auroral intensity and the triggering of the radar enhancements. It appears that the up- and down-shifted enhanced echoes correlate with fine auroral structures in different ways. Key words. Ionosphere (auroral ionosphere; plasma waves and instabilities) – Radio science (interferometry)

scholarly journals Statement of the Problem of Complete Set of UAV Group on the Basis of Models of Granular Calculations and Fuzzy Logic

2021 ◽  
pp. 25-38
Author(s):  
Vyacheslav Korolyov ◽  
Maksim Ogurtsov ◽  
Alexander Khodzinsky
Keyword(s):  
Fuzzy Logic ◽  
Aerial Photography ◽  
Situational Awareness ◽  
Video Camera ◽  
Video Data ◽  
Aerial Photographs ◽  
Navigation Data ◽  
Heterogeneous Groups ◽  
Big Data Technologies

Introduction. The increase in the number of heterogeneous groups of UAVs that jointly perform aerial photography missions generates a large amount of poorly structured information: videos, photos, telemetry records, navigation data. To build intelligent databases from unstructured information sources from UAV groups, granular computational approaches are proposed. These approaches are the basis for the application of Big Data technologies and artificial intelligence to increase situational awareness or commercial value of knowledge gained from the data flow from UAV groups. The purpose of the article. Develop new models for assessing the quality of video data from UAVs, approaches to equipping heterogeneous groups of UAVs and indicators for assessing its tactical and technical characteristics as a team. Results. The success of UAV group mission planning is based on the forecast of quantitative and qualitative indicators of the received video data. For this purpose, a model for forecasting the quality of the obtained aerial photographs based on the data on the speed, height of the UAV and the angle of the video camera is proposed. The model is based on the development of the theory of fuzzy sets of the first and second types. An example of the implementation of the model in the system of computer mathematics MatLab 2020b is given. Based on the analysis of a number of works on UAV classification and the proposed model of image quality, the method of equipment for the UAV group and the choice of UAV types are built, as well as the content of the combinatorial optimization problem based on the classic backpack problem. An example of calculations of tactical and technical characteristics for the Ukrainian UAV "Spectator" of Meridian ltd. is given. Conclusions. A new model for assessing the quality of aerial photography images based on fuzzy logic has been developed. The method of staffing UAV groups is proposed. Keywords: Fuzzy logic, granular calculations, UAV equipment, heterogeneous groups, computer simulation.

scholarly journals Artwork as Practical Social Action: An Ethnomethodological Study and the New Sociology of Art.

2021 ◽  
Author(s):  
Maximilon Baddeley
Keyword(s):  
Social Action ◽  
Social Order ◽  
Functional Significance ◽  
Ad Hoc ◽  
Video Camera ◽  
Video Data ◽  
Social Phenomena ◽  
Sociology Of Art ◽  
Observable Actions ◽  
Written Descriptions

<p>Few studies in the sociology of art observe artists in their work. Of the few, little investigate the phenomenon of social order, and when they do, they research artists at a distance. Hence, there is room to contribute studies and descriptions of the observable actions artists conduct when they find themselves in the midst of doing their work; that work is argued here as a sociological accomplishment, topic of interest, and evidence of the actual and not imagined practical management of social reality. An emergent literature, the new Sociology of Art, has started to pay close attention toward observing artists’ situated and sequential actions as they occur naturally and in real time. Yet neglected in these often overly conceptual studies are detailed descriptions of artists finding ad hoc solutions to their practical workplace problems. In my motivation to observe artists in their work, I ask how artworks are organised in and as practical social action. With video camera in hand and in aid by the sociological attitudes of ethnomethodology and its research praxis, I aim to explicate social phenomena of order, specifically observable within sites consisting of a street corner, an artist’s studio, an urban café, and river terrain. This thesis presents data first collected and then taken from the large video data corpus to form four single-cases. I recognise in this thesis the effort evident within ethnomethodology’s recent scholarship to acknowledge Aron Gurwitsch’s gestalt concept functional significance as partially influencing Harold Garfinkel’s study of endogenous order. I saw functional significance as an opportunity to explore, rather experimentally, how one artistic action relates to another, and how that interdependence was locally managed by the artists themselves during their artistic processes. This thesis contributes written descriptions of artistic action as social action, findings from which the new Sociology of Art may benefit.</p>

Sign in / Sign up

Export Citation Format

Share Document