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Figure 5. Integration of sensor array on airbag pillow for head posture recognition. (A) Schematic diagram illustrating the head posture recognition process through multi-channel sensing information acquisition by the pillow equipped with five sensors and machine learning by 1D CNN prediction model; (B) Different combinations of characteristic waveforms obtained by the five sensors for the three head postures; (C) Mapping of trained data in the 2D feature space; (D) Confusion matrix of the head gesture recognition classification results. 1D: One-dimensional; CNN: convolutional neural network; 2D: two-dimensional.