Abstract
Stress is an affective human state. Different types of stress have varying effects on human health. Previous stress classifications using tissue oxygen saturation (StO2) have relied on baselines to extract features in a way that limits practical application since the baselines cannot be preacquired. In this paper, we explored the correlation and the classification computability of the baseline-independent facial StO2 across four states involving baseline, emotional stress, high-intensity physical stress and low-intensity physical stress. Three analytical approaches verify that facial StO2 is affection-related and state-specific. Building on this theoretical foundation, we validated the baseline-independent facial StO2 before and after modified data augmentation using three input forms as well as two network structures. We also proposed a dual-stream (Channel stream and Spatial stream) attention network, named as CSnet, to perform baseline-independent stress classification. Experimental results suggest that the proposed method can achieve a unweighted average recall (UAR) of 0.6935 and unweighted F1-score (UF1) of 0.6991, which is higher than traditional image descriptors methods, and is more competitive than the baseline-dependent classification with respect of real applications.
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Data Availability
The original StO2 stress database used in this paper was derived from our previous work (see [8]), which was publicly released in 2020. In this paper, we further provide the mixup-expanded StO2 matrix data and RGB image format (not included in original database [8]) corresponding to all existing StO2 to comprise the database version II. Researchers can access the database by contacting the corresponding author to sign the License Agreement.
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Dong Chen and Ju Zhou are contributed equally to this work.
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Liu, X., Chen, D., Zhou, J. et al. Baseline-independent stress classification based on facial StO2. Appl Intell 53, 10255–10272 (2023). https://doi.org/10.1007/s10489-022-04041-x
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DOI: https://doi.org/10.1007/s10489-022-04041-x