Fig. 1: Contactless sensors for ambient intelligence. | Nature

Fig. 1: Contactless sensors for ambient intelligence.

From: Illuminating the dark spaces of healthcare with ambient intelligence

Fig. 1

Brightly coloured pixels denote objects that are closer to the depth sensor. Black pixels denote sensor noise caused by reflective, metallic objects. The radio sensor shows a micro-Doppler signature of a moving object, for which the x axis denotes time (5 s) and the y axis denotes the Doppler frequency. The radio sensor image is reproduced from ref. 89. The acoustic sensor displays an audio waveform of a person speaking, for which the x axis denotes time (5 s) and the y axis denotes the signal amplitude.

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