MAWI:Metasurface Aided WiFi Imaging

WiFi imaging is an emerging technology that can overcome camera limitations like occlusion and poor lighting. Imaging static objects without antenna arrays or mobile platforms is challenging. In this paper, we use a metasurface with a single pair of WiFi transceiver to achieve high-resolution WiFi imaging for static objects. We analyze the WiFi multipath propagation model with a metasurface and propose an imaging system. This system employs diverse radiation patterns by directing the WiFi beam reflected from the metasurface to illuminate a target. We utilize an image-guided diffusion model for high resolution imaging. We prototype MAWI with commodity WiFi and evaluate its performance in real environments. Experimental results show MAWI performs well on four typical target shapes.