Fig. 17

The intelligent metasurface for recognition and imaging. a The typical scenario of the human sensing and gesture recognition. (from Fig. 1 of Ref. [87]). b The designed programmable metasurface with 1-bit phase responses, as well as the architecture of intelligent system. (from Fig. 1 of Ref. [87]). c The phase and amplitude responses of coding element. (from Fig. 1 of Ref. [87]). d The data processing flow of the presented intelligent metasurface. (from Fig. 2 of Ref. [87]). Reproduced with permission from Ref. [87] under a Creative Commons Attribution 4.0 International License. Copyright 2019, Springer Nature