HIGHLIGHTS
SUMMARY
A key aspect of this study is to ensure that all steps, including those of face detection, skin image extraction, PPG signal conversion, and HR estimation, are realizable in real-time. For the given frame rate, to acquire a 1 s PPG, the authors need to perform 30 face detections and 30 skin image extractions from 30 video images within a second. Most previous studies have focused on the accuracy of HR estimation using P PGI17,33-36; however, such an algorithm, when applied to a robot in a system similar to the one . . .
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