Fig. 1. Schematic diagram of the compact dual optical path single-pixel imaging system. (a) Internal structure diagram of the camera; (b) Physical diagram

Fig. 2. The signal-to-noise ratio of the reconstructed image in different modes (64×64 pixel up-sampled to 128×128 pixel). (a) Non-differential imaging; (b) Dual optical path differential imaging; (c) Dual optical path average noise reduction

Fig. 3. (a) Simultaneous imaging of visible light and near-infrared (64×64 pixel up-sampling to 128×128 pixel); (b) Two-light path alternate sampling schematic diagram (32×32 pixel)