Single-pixel imaging (SPI) is a novel imaging method, which can reconstruct the object information by a single-pixel detector with no spatial resolution. However, at present, the field of view (FOV) of SPI is limited to the illumination range of the projected patterns; thus, this technology cannot meet the imaging requirements of a large FOV or even 360° view in many vision-based fields. Therefore, in order to extend the illumination range of the projected pattern, as well as the FOV of SPI, here, we design an omnidirectional single-pixel imaging system (OSPIS) by adding a curved mirror, which can illuminate scenes with a 360° omnidirectional FOV. And, a retina-like annular pattern with log-polar structure is designed to match the geometry of the curved mirror. Further, to obtain the panoramic single-pixel images that are adapted to the human vision system, combing the imaging feature of SPI, an unwrapping-free Fourier panoramic singlepixel imaging (FFPSI) is proposed to remove the unwrapping process from the reconstructed omnidirectional images. The proposed FFPSI provides a new way for the application of SPI with large FOV, especially for real-time panoramic SPI.
A novel approach based on the isomerous structure is proposed to improve the performances of liquid crystal optical phased array. Inspired by a space-variant structure, a series of kinoforms are sent to the spatial light modulator to produce space-variant beam steering. The mathematical model of the proposed is deduced and the key parameters are studied. Simulations and experiments are carried out to test the models. Simulations agree well with the experiments, which shows the correctness of the theory. The results are of interested to the integrated, low-cost, and stable beam steering system.
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