Paper presentation by CERTH and L3S at the Workshop on Open Challenges in Online Social Networks (OASIS), in conjunction with 32nd ACM Conference on Hypertext and Social Media — 30 August – 2 September 2021
Authors: Damianos Galanopoulos, Erick Elejalde, Alexandros Pournaras, Claudia Niederée, Vasileios Mezaris
Abstract: Understanding the factors related to migration, such as perceptions about routes and target countries, is critical for border agencies and society altogether. A systematic analysis of communication and news channels, such as social media, can improve our understanding of such factors. Videos and images play a critical role in social media as they have a significant impact on perception manipulation and misinformation campaigns. However, more research is needed in the identification of semantically relevant visual content for specific queried concepts. Furthermore, an important problem to overcome in this area is the lack of annotated datasets that could be used to create and test accurate models. A recent study proposed a novel video representation and retrieval approach that effectively bridges the gap between a substantiated domain understanding encapsulated into textual descriptions of Migration Related Semantic Concepts (MRSCs) – and the expression of such concepts in a video. In this work, we build on this approach and propose an improved procedure for the crucial step of the concept labels’ textual augmentation, which contributes towards the full automation of the pipeline. We assemble the first, to the best of our knowledge, migration-related videos and images dataset, and we experimentally assess our method on it.