Abstract: Ghost imaging has potential imaging advantages in the non-visible light band where the traditional array imaging technology can’t properly work, and has been widely concerned in recent years. A series modulation illumination light irradiates the imaging scene, a detector with non-spatial resolution records the corresponding light intensities. The image of the imaged object can be reconstructed by combining the light intensities with the modulation masks. The imaging mechanism of ghost imaging determines that it is an imaging strategy that sacrifices the time resolution for spatial resolution. The spatial resolution and time resolution of ghost imaging are mutually restricted. A cosine encoded multiplexing high spatial resolution ghost imaging technology is demonstrated. Many low spatial resolution cosine encoded patterns are multiplexed to produce high spatial resolution modulation patterns, and then illuminate the imaged object. A single-pixel detector collects the backscattered light generated by the interaction between the modulated light and the object. The mixed image of the high spatial resolution object can be recovered by the linear iterative algorithm. Given the unique deterministic spectrum structure of employed cosine encoded matrices, so the digital image processing methods can be used to decode and reconstruct the low spatial resolution images of the high spatial resolution imaged object. The implementation method of the proposed cosine encoded multiplexing high spatial resolution ghost imaging technology is analyzed theoretically. And the effectiveness of the method is verified by numerical simulation. The proposed method greatly reduces the modulation patterns required for traditional high spatial resolution ghost imaging, and reduces the online sampling and reconstruction time consumption.

Key words: quantum optics, ghost imaging, Fourier transform, cosine encoded multiplexing, high spatial resolution imaging