@inproceedings{db818f60d1254f259b39fe42589c89a7,
title = "When VLC Meets Under-Screen Camera",
abstract = "While radio communication still dominates in 5G, light and radios are expected to complement each other in the coming 6G networks. Visible Light Communication (VLC) is therefore attracting a tremendous amount of attention from both academia and industry. Recent studies showed that the front camera of pervasive smartphones is an ideal candidate to serve as the VLC receiver. While promising, we observe a recent trend with smartphones that can greatly hinder the adoption of smartphones for VLC, i.e., smartphones are moving towards full-screen for the best user experience. This trend forces front cameras to be placed under the devices' screen - -leading to the so-called Under-Screen Camera (USC) - -but we observe a severe performance degradation in VLC with USC: the transmission range is reduced from a few meters to merely 0.04 m, and the throughput is decreased by more than 90%. To address this issue, we leverage the unique spatiotemporal characteristics of the rolling shutter effect on USC to design a pixel-sweeping algorithm to identify the sampling points with minimal interference from the translucent screen. We further propose a novel slope-boosting demodulation method to deal with color shift brought by the leakage interference. We build a proof-of-concept prototype using two commercial smart-phones. Experiment results show that our proposed design reduces the BER by two orders of magnitude on average and improves the data rate by 59×: from 914 b/s to 54.43 kb/s. The transmission range is extended by roughly 100×: from 0.04 m to 4.2 m. ",
keywords = "color-shift keying, full-screen, optical camera communication, through-screen VLC, translucent screen, under-screen camera",
author = "Hanting Ye and Jie Xiong and Qing Wang",
year = "2023",
doi = "10.1145/3581791.3596855",
language = "English",
series = "MobiSys 2023 - Proceedings of the 21st Annual International Conference on Mobile Systems, Applications and Services",
publisher = "Association for Computing Machinery (ACM)",
pages = "343--355",
booktitle = "MobiSys 2023 - Proceedings of the 21st Annual International Conference on Mobile Systems, Applications and Services",
address = "United States",
note = "21st Annual International Conference on Mobile Systems, Applications and Services, MobiSys 2023 ; Conference date: 18-06-2023 Through 22-06-2023",
}