University of Oulu

Z. Sun and X. Li, "Privacy-Phys: Facial Video-Based Physiological Modification for Privacy Protection," in IEEE Signal Processing Letters, vol. 29, pp. 1507-1511, 2022, doi: 10.1109/LSP.2022.3185964

Privacy-Phys : facial video-based physiological modification for privacy protection

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Author: Sun, Zhaodong1; Li, Xiaobai1
Organizations: 1Center for Machine Vision and Signal Analysis, University of Oulu, 90014 Oulu, Finland
Format: article
Version: published version
Access: open
Online Access: PDF Full Text (PDF, 1.6 MB)
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Language: English
Published: Institute of Electrical and Electronics Engineers, 2022
Publish Date: 2022-08-24


The invisible remote photoplethysmography (rPPG) signals in facial videos can reveal the cardiac rhythm and physiological status. Recent studies show that rPPG is a non-contact way for emotion recognition, disease detection, and biometric identification, which means there is a potential privacy problem about physiological information leakage from facial videos. Therefore, it is essential to process facial videos to prevent rPPG extraction in privacy-sensitive situations such as online video meetings. In this letter, we propose Privacy-Phys, a novel method based on a pre-trained 3D convolutional neural network, to modify rPPG in facial videos for privacy protection. Our experimental results show that our approach can modify rPPG signals in facial videos more effectively and efficiently than the previous baseline. Our method can be applied to process facial videos in online video meetings or video-sharing platforms to prevent rPPG from being captured maliciously.

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Series: IEEE signal processing letters
ISSN: 1070-9908
ISSN-E: 1558-2361
ISSN-L: 1070-9908
Volume: 29
Pages: 1507 - 1511
DOI: 10.1109/lsp.2022.3185964
Type of Publication: A1 Journal article – refereed
Field of Science: 113 Computer and information sciences
Funding: This work was supported in part by the Academy of Finland under Grants 323287 and 345948, and in part by the Finnish Work Environment Fund under Grant 200414.
Academy of Finland Grant Number: 323287
Detailed Information: 323287 (Academy of Finland Funding decision)
345948 (Academy of Finland Funding decision)
Copyright information: © The Author(s) 2022. This work is licensed under a Creative Commons Attribution 4.0 License. For more information, see