Search results for "Video based"
showing 7 items of 7 documents
Artificial Versus Video-Based Immersive Virtual Surroundings: Analysis of Performance and User's Preference.
2018
Introduction. Immersive virtual reality (VR) laparoscopy simulation connects VR simulation with head-mounted displays to increase presence during VR training. The goal of the present study was the comparison of 2 different surroundings according to performance and users’ preference. Methods. With a custom immersive virtual reality laparoscopy simulator, an artificially created VR operating room (AVR) and a highly immersive VR operating room (IVR) were compared. Participants (n = 30) performed 3 tasks (peg transfer, fine dissection, and cholecystectomy) in AVR and IVR in a crossover study design. Results. No overall difference in virtual laparoscopic performance was obtained when comparing …
A new video-based tool to enhance teaching economics
2018
Abstract We present a new video-based tool developed in Germany to enhance the teaching of economics. The tool consists of authentic teacher-student interactions in economics classes to which instructors need to react. With 18 videos, the tool provides an easily accessible opportunity to assess and enhance teaching performance in economics. The tool was rated by 41 highly experienced secondary school economics teachers according to different criteria relevant for curriculum design and instructional practice, including authenticity of the simulated classroom situations, and typical difficulties and misconceptions students have in learning economics. The teachers confirm the curricular and in…
Comparison of region of interest segmentation methods for video-based heart rate measurements
2018
International audience; Conventional contact photoplethysmography (PPG) sensors are not suitable in situations of skin damage or when unconstrained movement is required. As a consequence, remote photoplethysmography (rPPG) has recently emerged because it provides remote physiological measurements without expensive hardware and improves comfort for long-term monitoring. RPPG estimation methods use the spatially averaged RGB values of pixels in a Region Of Interest (ROI) to generate a temporal RGB signal. The selection of ROI is a critical first step to obtain reliable pulse signals and must contain as many skin pixels as possible with a low percentage of non-skin pixels. In this paper, we ex…
Vertical ground reaction force measurements and video measurements provide comparable estimates of distance moved by mice during artificial light and…
2011
Video-based measures of spontaneous activity of rodents are of interest in studying, e.g. physiology. However, video-based tracking methods typically require light. The purpose of the present study was to develop a video based method for tracking movements of mice during a dark period. The method was applied in comparing the dark and light period activities of mice. Ten male mice were used in the present study. The activity of the animals was monitored simultaneously with video and ground reaction force (GRF) recordings during consecutive 12h periods of artificial light and dark. Texture based background subtraction method was used to track the mouse from the video recording, while the weig…
Evaluating and developing teacher instructional practices in economics using a new video-based test
2022
Abstract Teachers’ instructional practices are important for student learning. However, there are few tools for evaluating instructional practices in social studies. To this end, we present a video-based instrument with teacher-student interactions for assessing teaching practices in a high school economics course. We investigate, using an iterative design-based methodology, the adaptation and validation of a test originally developed in Germany for use in the United States. We found that experienced economics teachers and those with more content knowledge demonstrated higher-level instructional skills, and were more flexibile with their thinking. Inexperienced economics teachers and those …
Inferior mesenteric vein as initial landmark for laparoscopic medial to lateral dissection of descending colon - a video vignette
2017
The root of the inferior mesenteric artery is an important area where autonomic nerves are close by, the dissection can be hard and laborious in order to avoid nerve damage; and the separation of mesocolon and retroperitoneum in this area can sometimes be difficult. The inferior mesenteric vein dissection is an alternative option as the first step during medial to lateral approach of laparoscopic left mesocolon mobilisation, as we have shown in this video based on two real cases and two anatomical cadaveric dissection. This article is protected by copyright. All rights reserved.
Flipped Learning Experiment in Video-Based Education
2017
Videos intended for educational use have increased significantly in recent years. This is partly due to the increasing use of videos for entertainment purposes, as well as an increase in broadband connections. Educational videos may include short video clips, screen capture videos or, for example, recordings from the classroom teaching situation. Videos can be utilized in revising, for compensating absences, making teaching more flexible or for developing presentation skills. The recording also enables the re-use of lectures. This allows completely new types of educational solutions, such as the implementation of flipped learning. In flipped learning, activities traditionally carried out in…