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  • About
  • The Global ETD Search service is a free service for researchers to find electronic theses and dissertations. This service is provided by the Networked Digital Library of Theses and Dissertations.
    Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
1

Towards an Integration of 360-Degree Video in Higher Education. Workflow, challenges and scenarios

Feurstein, Michael Sebastian January 2018 (has links) (PDF)
Today video is being used in different facets supporting the e-learning experience. With a resurging interest and reduced barriers of entry to experience virtual and augmented reality applications, 360-degree video technology is becoming relevant as an option to produce and consume content for VR/AR applications. 360-degree video offers new features, which can prove useful in teaching & learning scenarios with a need for self directed control of view direction, immersion and a feeling of presence. Current adoptions of 360-degree videos are integrated manually for specialized activity-oriented learning scenarios. However, in order to adopt 360- degree video on a larger scale, a sufficient technical integration is required and knowledge of application scenarios needs to be communicated. To approach this challenge, workflow steps are analyzed, challenges are identified and scenarios are described in the context of creating 360- degree video content for higher education. We identify open gaps, which need to be addressed in order to integrate 360-degree video technology in an automated video processing tool chain.
2

[pt] LOCALIZAÇÃO ESPAÇO-TEMPORAL DE ATORES EM VÍDEOS/VÍDEOS 360 E SUAS APLICAÇÕES / [en] SPATIO-TEMPORAL LOCALIZATION OF ACTORS IN VIDEO/360-VIDEO AND ITS APPLICATIONS

13 September 2021 (has links)
[pt] A popularidade de plataformas para o armazenamento e compartilhamento de vídeo tem criado um volume massivo de horas de vídeo. Dado um conjunto de atores presentes em um vídeo, a geração de metadados com a determinação temporal dos intervalos em que cada um desses atores está presente, bem como a localização no espaço 2D dos quadros em cada um desses intervalos pode facilitar a recuperação de vídeo e a recomendação. Neste trabalho, nós investigamos a Clusterização Facial em Vídeo para a localização espaço-temporal de atores. Primeiro descrevemos nosso método de Clusterização Facial em Vídeo em que utilizamos métodos de detecção facial, geração de embeddings e clusterização para agrupar faces dos atores em diferentes quadros e fornecer a localização espaço-temporal destes atores. Então, nós exploramos, propomos, e investigamos aplicações inovadoras dessa localização espaço-temporal em três diferentes tarefas: (i) Reconhecimento Facial em Vídeo, (ii) Recomendação de Vídeos Educacionais e (iii) Posicionamento de Legendas em Vídeos 360 graus. Para a tarefa (i), propomos um método baseado na similaridade de clústeres que é facilmente escalável e obteve um recall de 99.435 por cento e uma precisão de 99.131 por cento em um conjunto de vídeos. Para a tarefa (ii), propomos um método não supervisionado baseado na presença de professores em diferentes vídeos. Tal método não requer nenhuma informação adicional sobre os vídeo e obteve um valor mAP aproximadamente 99 por cento. Para a tarefa (iii), propomos o posicionamento dinâmico de legendas baseado na localização de atores em vídeo 360 graus. / [en] The popularity of platforms for the storage and transmission of video content has created a substantial volume of video data. Given a set of actors present in a video, generating metadata with the temporal determination of the interval in which each actor is present, and their spatial 2D localization in each frame in these intervals can facilitate video retrieval and recommendation. In this work, we investigate Video Face Clustering for this spatio-temporal localization of actors in videos. We first describe our method for Video Face Clustering in which we take advantage of face detection, embeddings, and clustering methods to group similar faces of actors in different frames and provide the spatio-temporal localization of them. Then, we explore, propose, and investigate innovative applications of this spatio-temporal localization in three different tasks: (i) Video Face Recognition, (ii) Educational Video Recommendation and (iii) Subtitles Positioning in 360-video. For (i), we propose a cluster-matching-based method that is easily scalable and achieved a recall of 99.435 percent and precision of 99.131 percent in a small video set. For (ii), we propose an unsupervised method based on them presence of lecturers in different videos that does not require any additional information from the videos and achieved a mAP approximately 99 percent. For (iii), we propose a dynamic placement of subtitles based on the automatic localization of actors in 360-video.

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