“…Other wearable sensors used in HAR include (but are not limited to) piezoelectric sensor [66,67] for converting changes in pressure, acceleration, temperature, strain, or force to electrical charge, barometric pressure sensor [68] for atmospheric pressure, temperature measurement [69], electroencephalography (EEG) for measuring brain activity [70], respiration sensors for breathing monitoring [71], ultraviolet (UV) sensors [72] for sun exposure assessment, GPS for location sensing, microphones for audio recording [39,73,74], and wearable cameras for image or video recording [55]. It is also important to note that the wearable camera market has drastically grown with cameras such as GoPro becoming mainstream [75][76][77][78] over the last few years. However, due to privacy concerns posed by participants related to video recording, utilizing wearable cameras for longitudinal activity recognition is not as prevalent as other sensors.…”