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Enhancing Lecture Capture with Deep Learning

Sales, R.M.; Giani, S.


R.M. Sales


This paper provides an insight into the development of a state-of-the-art video processing system to address limitations within Durham University’s ‘Encore’ lecture capture solution. The aim of the research described in this paper is to digitally remove the persons presenting from the view of a whiteboard to provide students with a more effective online learning experience. This work enlists a ‘human entity detection module’, which uses a remodelled version of the Fast Segmentation Neural Network to perform efficient binary image segmentation, and a ‘background restoration module’, which introduces a novel procedure to retain only background pixels in consecutive video frames. The segmentation network is trained from the outset with a Tversky loss function on a dataset of images extracted from various Tik-Tok dance videos. The most effective training techniques are described in detail, and it is found that these produce asymptotic convergence to within 5% of the final loss in only 40 training epochs. A cross-validation study then concludes that a Tversky parameter of 0.9 is optimal for balancing recall and precision in the context of this work. Finally, it is demonstrated that the system successfully removes the human form from the view of the whiteboard in a real lecture video. Whilst the system is believed to have the potential for real-time usage, it is not possible to prove this owing to hardware limitations. In the conclusions, wider application of this work is also suggested.


Sales, R., & Giani, S. (in press). Enhancing Lecture Capture with Deep Learning. Advances in Engineering Software,

Journal Article Type Article
Acceptance Date Sep 12, 2022
Deposit Date Sep 13, 2022
Publicly Available Date Sep 22, 2023
Journal Advances in Engineering Software
Print ISSN 0965-9978
Publisher Elsevier
Peer Reviewed Peer Reviewed
Publisher URL