Access-controlled imaging via structured single-pixel illumination.

Single-pixel imaging shows great potential for parallel perception of multiple objects. However, existing methods face information security risks and lack effective user access control. In this Letter, we propose an access-controlled imaging method based on structured single-pixel illumination. The system introduces phase modulation equivalently into the measurement matrix by applying key-controlled spatial displacements to the projection patterns, without requiring additional modulation devices. Meanwhile, an optical projection multiplexing architecture enables linear mixing of multi-object information. During reconstruction, the template decomposition vectors serve as user-specific keys for selective imaging. Experimental results demonstrate high-quality parallel imaging with integrated physical-layer access control, providing a promising solution for secure communication and hierarchical surveillance.