Single-pixel imaging (SPI) has attracted widespread attention because it generally uses a non-pixelated photodetector and a digital micromirror device (DMD) to acquire the object image. Since the modulated patterns seen from two reflection directions of the DMD are naturally complementary, one can apply complementary balanced measurements to greatly improve the measurement signal-to-noise ratio and reconstruction quality. However, the balance between two reflection arms significantly determines the quality of differential measurements. In this work, we propose and demonstrate a simple secondary complementary balancing mechanism to minimize the impact of the imbalance on the imaging system. In our SPI setup, we used a silicon free-space balanced amplified photodetector with 5 mm active diameter which could directly output the difference between two optical input signals in two reflection arms. Both simulation and experimental results have demonstrated that the use of secondary complementary balancing can result in a better cancellation of direct current components of measurements, and can acquire an image quality slightly better than that of single-arm single-pixel complementary measurement scheme (which is free from the trouble of optical imbalance) and over 20 times better than that of double-arm dual-pixel complementary measurement scheme under optical imbalance conditions.

Abstract. The perishability of fresh agricultural products and real-time traffic information greatly reduce the customers' satisfaction with fresh products distribution. In this paper, the vehicle distribution model for fresh agricultural products was established to maximize customers' satisfaction with delivery time and freshness based on real-time traffic information. Genetic algorithm was adapted to get initial routes and dynamic adjusted routes. The results show that customers' satisfaction can be improved and effect of dynamic traffic can be weakened by rational initial routing optimization and dynamic adjustment.