Implementation of Video Capture Based on DirectShow Technology

2011 ◽  
Vol 65 ◽  
pp. 113-116
Author(s):  
Qi Li ◽  
Yan Dong Zhang
Keyword(s):  
Real Time ◽  
Video Stream ◽  
Software System ◽  
Test Results ◽  
Video Capture ◽  
High Quality ◽  
Design Scheme

The basic conception of DirectShow is introduced, to conquer the limitation of the major capture plans that the picture forms obtained from different device that are difficult to deal with, by the filter graph is built, a design scheme of video capture software system based on DirectShow is presented, which is based on Windows and give supports to different drive models and different interface ; the structure of the software is discussed, software has reusability .Test results show that the system can run steadily and reliably, and has the characteristics of real time ,high quality of the video stream; the system is flexible and expansive.

scholarly journals QoS to QoE Mapping Function for Iptv Quality Assessement Based on Kohonen Map: A Pilot Study

2020 ◽  
Vol 21 (3) ◽  
pp. 181-190
Author(s):  
Jaroslav Frnda ◽  
Marek Durica ◽  
Mihail Savrasovs ◽  
Philippe Fournier-Viger ◽  
Jerry Chun-Wei Lin
Keyword(s):  
Real Time ◽  
Service Providers ◽  
Mapping Function ◽  
Video Stream ◽  
Assessment Method ◽  
End User ◽  
Quality Perception ◽  
Video Assessment ◽  
Kohonen Map

AbstractThis paper deals with an analysis of Kohonen map usage possibility for real-time evaluation of end-user video quality perception. The Quality of Service framework (QoS) describes how the network impairments (network utilization or packet loss) influence the picture quality, but it does not reflect precisely on customer subjective perceived quality of received video stream. There are several objective video assessment metrics based on mathematical models trying to simulate human visual system but each of them has its own evaluation scale. This causes a serious problem for service providers to identify a critical point when intervention into the network behaviour is needed. On the other hand, subjective tests (Quality of Experience concept) are time-consuming and costly and of course, cannot be performed in real-time. Therefore, we proposed a mapping function able to predict subjective end-user quality perception based on the situation in a network, video stream features and results obtained from the objective video assessment method.

scholarly journals An Adaptive Bitrate Switching Algorithm for Speech Applications in Context of WebRTC

2021 ◽  
Vol 17 (4) ◽  
pp. 1-21
Author(s):  
Mohannad Alahmadi ◽  
Peter Pocta ◽  
Hugh Melvin
Keyword(s):  
Real Time ◽  
Data Exchange ◽  
Quality Of Experience ◽  
End User ◽  
High Quality ◽  
Content Type ◽  
Switching Algorithm ◽  
Wide Range ◽  
The Impact

Web Real-Time Communication (WebRTC) combines a set of standards and technologies to enable high-quality audio, video, and auxiliary data exchange in web browsers and mobile applications. It enables peer-to-peer multimedia sessions over IP networks without the need for additional plugins. The Opus codec, which is deployed as the default audio codec for speech and music streaming in WebRTC, supports a wide range of bitrates. This range of bitrates covers narrowband, wideband, and super-wideband up to fullband bandwidths. Users of IP-based telephony always demand high-quality audio. In addition to users’ expectation, their emotional state, content type, and many other psychological factors; network quality of service; and distortions introduced at the end terminals could determine their quality of experience. To measure the quality experienced by the end user for voice transmission service, the E-model standardized in the ITU-T Rec. G.107 (a narrowband version), ITU-T Rec. G.107.1 (a wideband version), and the most recent ITU-T Rec. G.107.2 extension for the super-wideband E-model can be used. In this work, we present a quality of experience model built on the E-model to measure the impact of coding and packet loss to assess the quality perceived by the end user in WebRTC speech applications. Based on the computed Mean Opinion Score, a real-time adaptive codec parameter switching mechanism is used to switch to the most optimum codec bitrate under the present network conditions. We present the evaluation results to show the effectiveness of the proposed approach when compared with the default codec configuration in WebRTC.

scholarly journals Evolution of orbit and clock quality for real-time multi-GNSS solutions

GPS Solutions ◽  
2020 ◽  
Vol 24 (4) ◽  
Author(s):  
Kamil Kazmierski ◽  
Radoslaw Zajdel ◽  
Krzysztof Sośnica
Keyword(s):  
Real Time ◽  
Atomic Clock ◽  
Orbital Plane ◽  
Poor Quality ◽  
Satellite Orbits ◽  
High Quality ◽  
Changes Over Time ◽  
Over Time ◽  
Orbit Characteristics

Abstract High-quality satellite orbits and clocks are necessary for multi-GNSS precise point positioning and timing. In undifferenced GNSS solutions, the quality of orbit and clock products significantly influences the resulting position accuracy; therefore, for precise positioning in real time, the corrections for orbits and clocks are generated and distributed to users. In this research, we assess the quality and the availability of real-time CNES orbits and clocks for GPS, GLONASS, Galileo, and BeiDou-2 separated by satellite blocks and types, as well as the product quality changes over time. We calculate the signal-in-space ranging error (SISRE) as the main orbit and clock quality indicator. Moreover, we employ independent orbit validation based on satellite laser ranging. We found that the most accurate orbits are currently available for GPS. However, Galileo utmost stable atomic clocks compensate for systematic errors in Galileo orbits. As a result, the SISRE for Galileo is lower than that for GPS, equaling 1.6 and 2.3 cm for Galileo and GPS, respectively. The GLONASS satellites, despite the high quality of their orbits, are characterized by poor quality of clocks, and together with BeiDou-2 in medium and geosynchronous inclined orbits, are characterized by SISRE of 4–6 cm. BeiDou-2 in geostationary orbits is characterized by large orbital errors and the lowest availability of real-time orbit and clock corrections due to a large number of satellite maneuvers. The quality of GNSS orbit and clock corrections changes over time and depends on satellite type, block, orbit characteristics, onboard atomic clock, and the sun elevation above the orbital plane.

Design of High Accuracy Robot Welding Machine for a Cone Bottom

2014 ◽  
Vol 496-500 ◽  
pp. 1289-1292
Author(s):  
De Huan Tang ◽  
De Yang Luo
Keyword(s):  
Real Time ◽  
Tracking System ◽  
High Accuracy ◽  
Welding Robot ◽  
Robotic Welding ◽  
High Quality ◽  
The Real ◽  
Laser Tracking ◽  
Welding Machine

This paper designed a special welding machine for an aluminum cone bottom workpiece. This machine contains highly accurate positioner system, laser tracking system, and robotic welding devices. It is used to weld the transverse seams and the longitudinal seams of the workpiece. The interaction of welding robot with positioner and the real-time seam correcting can ensure high quality of welding.

scholarly journals Effect of Scientific Approach toward Students' Critical Thinking Skills

2019 ◽  
Vol 7 (1) ◽  
pp. 15
Author(s):  
Triyani Triyani ◽  
Lovy Herayanti ◽  
Syifaul Gummah
Keyword(s):  
Critical Thinking ◽  
Hypothesis Test ◽  
Thinking Skills ◽  
Critical Thinking Skills ◽  
Test Results ◽  
High Quality ◽  
Scientific Approach ◽  
The Impact

The role of education is to improve the quality of education, especially in producing high-quality students. High-quality students are those who are able to think critically, creatively, logically and take initiatives in responding to issues in society caused by the impact of the development of science and technology. This study aims to determine the effect of a scientific approach to students' critical thinking skills. This study is an experimental research with one group pretest-posttest design. The sample of this study consisted of one class (28 students), which was treated using a scientific approach. Critical thinking skills are measured using a test instrument and then analyzed statistically (t test). Hypothesis test results indicate that there is an effect of using a scientific approach toward students' critical thinking skills.

scholarly journals Analysis Tunneling IPv4 and IPv6 on VoIP Network

2018 ◽  
pp. 337-344 ◽  
Author(s):  
Muhammad Ismu Haji ◽  
Sugeng Purwantoro E.S.G.S ◽  
Satria Perdana Arifin
Keyword(s):  
Real Time ◽  
Packet Loss ◽  
Test Results ◽  
The Real ◽  
Ip Addresses ◽  
Internet Users ◽  
Jitter Delay ◽  
Ipv4 Address

Using of IP addresses is currently still using IPv4. Meanwhile, the availability of the IPv4 address is gradually diminishes. IPv4 has a limited address capacity. IPv6 was developed with a capacity greater than IPv4. Connect between IPv4 and IPv6 without having to interfere with the existing infrastructure. So, methods like tunneling are needed. Tunneling builds a way that IPv4 and IPv6 can communicate. 6to4 tuning makes IPv6 able to communicate with IPv4 over IPv4 infrastructure. Real time communication is needed by internet users to be able to connect to each other. One of the real time communications is VoIP. To find out the quality of tunneling implemented on a VoIP network, it will analyze QoS such as delay, packet loss, and jitter. Delay obtained is 20,01ms for IPv4, 19,99ms for IPv6 and 20,03ms for 6to4. Packet loss obtained 0,01% for IPv4, IPv6 0,01% and 6to4 0,08%. The obtained jitter is 7,96ms for IPv4, IPv6 7.39ms, and 8,48 for 6to4. The test results show that using IPv6 gets a better QoS value than using IPv4 and 6to4 tunneling. The results using 6to4 tunneling obtained the highest QoS value between IPv4 and IPv6. Implementation using 6to4 tunneling results in high results because, IPv6 packets that are sent are wrapped into the IPv4 form to get through the IPv4 infrastructure. 

scholarly journals Quality of Written Feedback given to Medical Students after Introduction of Real-Time Audio Monitoring of Clinical Encounters

2020 ◽  
Author(s):  
Michael Sanatani ◽  
Kylea Potvin ◽  
Henry Conter ◽  
Andrew Warner ◽  
Kimberly Trudgeon
Keyword(s):  
Real Time ◽  
Body Language ◽  
Written Feedback ◽  
Feedback Process ◽  
Patient Encounter ◽  
High Quality ◽  
Usual Practice ◽  
Clinical Encounters ◽  
Easy Integration

Abstract Background Direct observation is necessary for specific and actionable feedback, however clinicians often struggle to integrate observation into their practice. Remotely audio-monitoring trainees for periods of time may improve the quality of written feedback given to them, and may be a minimally disruptive task for a consultant to perform in a busy clinic.Methods Selected faculty used a wireless audio receiver during the second half of students' oncology rotations to listen to encounters during clinic in real time. They then gave written feedback as per usual practice, as did faculty who did not use the listening-in intervention. Feedback was de-identified and rated, using a rubric, as strong/medium/weak according to consensus of 2/3 rating investigators.Results Monitoring faculty indicated that audio monitoring made the feedback process easier and increased confidence in 95% of encounters. Most students (19/21 respondents) felt monitoring contributed positively to their learning, and included more useful comments. 101 written evaluations were completed by 7 monitoring and 19 non-monitoring faculty. 22/23 (96%) of feedback after monitoring was rated as high quality, compared to 16/37 (43%) (p<0.001) for monitoring faculty before using the equipment (and 20/78 (26%) without monitoring for all consultants (p<0.001)).Conclusions Using live audio monitoring improved the quality of written feedback given to trainees, as judged by the trainees themselves and also using an exploratory grading rubric. The method was well received by both faculty and trainees. Although there are limitations compared to in-the-room observation (body language), the benefits of easy integration into clinical practice and a more natural patient encounter without the observer physically present lead the authors to now use this method routinely while teaching oncology students.

scholarly journals Results of experimental tests of building samples

2021 ◽  
Vol 939 (1) ◽  
pp. 012031
Author(s):  
M Yu Narkevich ◽  
O S Logunova ◽  
P I Kalandarov ◽  
R T Gazieva ◽  
G M Aralov ◽  
...  
Keyword(s):  
Initial Data ◽  
Real Time ◽  
Construction Projects ◽  
Experimental Studies ◽  
Experimental Tests ◽  
Video Stream ◽  
New Knowledge ◽  
Full Scale Tests ◽  
Level Of Analysis

Abstract The purpose of the experimental study presented in the work is to generate new knowledge about the quality of concrete samples in a new information field that consolidates information about the results of full-scale tests and video streams that were obtained during active laboratory experiments-studies. When conducting experimental studies, the traditional technology of testing concrete samples for central compression was used. This was accompanied by continuous monitoring and the formation of a video stream for each sample. A distinctive feature of the study is the formation of an information field of experiments, which contains three levels: the level of initial data, the level of analysis of initial data and the level of generation of new knowledge. The level of analysis of the source data using the video stream allows you to obtain information at the end of the experiment that cannot be recorded in real time. For the samples under study, time intervals with different rates of defect development were obtained. The results obtained made it possible to identify new possibilities for the formation of the information field during traditional experimental studies of the quality of concrete images and, based on the information obtained, to identify patterns of development of surface continuity disorders in dynamics. New opportunities for the formation of the information field allow in real time to obtain and process information on the state of concrete and reinforced concrete structures of construction projects by quality indicators and, on the basis of the data obtained, predicting the risk of accidents, including at hazardous production facilities.

Composite C-C Columns by Utilizing of UHPFRC

2016 ◽  
Vol 691 ◽  
pp. 108-118
Author(s):  
Igor Hudoba
Keyword(s):  
Concrete Columns ◽  
Test Results ◽  
High Quality ◽  
Load Bearing ◽  
Composite Columns ◽  
Steel Core ◽  
New Information ◽  
Laboratory Test Results ◽  
Ordinary Type

Main advantage of composite concrete columns, in comparison with traditional reinforced concrete columns, is its increased load-bearing capacity by using of solid steel reinforcing core. Ordinary type of such a steel-concrete (S-C) composite column consists of normal concrete and different type of solid steel core. In last decades high quality concrete is more and more used for load-bearing structural members exposed compression like columns. Present knowledge level in the area of ultra-high quality of concrete open a new chance for utilization of this progressive structural material in concrete building industry. This paper presents some new information and laboratory test results of concrete-concrete (C-C) composite columns by utilizing of UHPFRC.

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