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A self-attention model for viewport prediction based on distance constraint

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Abstract

Panoramic video multimedia technology has made significant advancements in recent years, providing users with an immersive experience by displaying the entire 360° spherical scene centered around their virtual location. However, due to its larger data volume compared to traditional video formats, transmitting high-quality videos requires more bandwidth. It is important to note that users do not see the whole 360° content simultaneously, but only a portion that is within their viewport. To save bandwidth, viewport-based adaptive streaming has become a significant technology that transmits only the viewports of interest to the user in high quality. Therefore, the accuracy of viewport prediction plays a crucial role. However, the performance of viewport prediction is affected by the size of the prediction window, which decreases significantly as the window size increases. In order to address this issue, we propose an effective self-attention viewport prediction model based on distance constraint in this paper. Firstly, by analyzing the existing viewport trajectory dataset, we find the randomness and continuity of the viewport trajectory. Secondly, to solve the randomness problem, we design a viewport prediction model based on a self-attention mechanism to provide more trajectory information for long inputs. Thirdly, in order to ensure the continuity of the predicted viewport trajectory, the loss function is modified with the distance constraint to reduce the change in the continuity of prediction results. Finally, the experimental results based on the real viewport trajectory datasets show that the algorithm we propose has higher prediction accuracy and stability compared with the advanced models.

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Data availability

The datasets generated during and/or analyzed during the current study are available from the corresponding author on reasonable request.

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Authors and Affiliations

  1. School of Advanced Manufacturing, Fuzhou University, Quanzhou, 362200, Fujian, China

    ChengDong Lan  & Xu Qiu

  2. Fujian Provincial Key Laboratory of Media Information Intelligent Processing and Wireless Transmission, Fuzhou, 350108, China

    ChengDong Lan  & Chenqi Miao

  3. College of Physics and Information Engineering, Fuzhou University, Fuzhou, 350108, China

    ChengDong Lan , Chenqi Miao & MengTing Zheng

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  1. ChengDong Lan
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Lan , C., Qiu, X., Miao, C. et al. A self-attention model for viewport prediction based on distance constraint. Vis Comput (2023). https://doi.org/10.1007/s00371-023-03149-6

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