QIF-T0098

WiFi + camera passive surveillance fusion (through-wall presence detection with visual identification)

WiFi CSI (T0090) provides through-wall presence detection, vital signs, and coarse pose estimation but cannot visually identify targets. Cameras (T0084) provide visual identification and remote PPG but require line of sight. By fusing WiFi CSI and camera data, an attacker achieves persistent surveillance that combines the strengths of both: WiFi tracks targets through walls and identifies them by body shape/gait, while cameras provide visual identification when line of sight is available. The fusion enables: handoff tracking (camera identifies person entering a building, WiFi CSI tracks them inside), activity recognition (WiFi CSI classifies activity, camera confirms), and vital sign correlation (WiFi breathing rate + camera heart rate). Zhao et al. (2018) demonstrated that WiFi signals alone can reconstruct 2D human poses comparable to visual skeleton tracking. This creates a surveillance system that requires no devices on the target and works through physical barriers.