Fig. 3. In situ imaging results using the intelligent metasurface with active microwave.

(Top row) The first row shows the optical images of specimen, which include single person with different gestures, two persons with different gestures, and two persons behind a 5-cm-thick wooden wall. (Middle) The second row illustrates the corresponding imaging results by the intelligent metasurface with IM-CNN-1. (Bottom) The bottom row presents corresponding amplitudes of microwave data