A high-resolution field of view expansion method for single-pixel imaging systems based on DMD and scanning mirror.

Single-pixel imaging (SPI) has significant advantages in detecting complex environments such as solid noise, high scattering, and long distances. In response to the contradiction between the field of view and resolution in traditional SPI systems, we propose a field of view expansion imaging method based on a digital micromirror device (DMD) and scanning mirror. Combining the advantages of traditional point scanning and SPI, we use high-precision control of the scanning mirror (with an error control of ± 3 mV) to scan and expand the reflected image on the target object onto the DMD, then using compressed sensing to achieve efficient sampling, thereby expanding the imaging field of view. We use the optimized TVAL3 algorithm for image recovery and reconstruction and stitching is performed. For second and third order imaging, results show that the imaging resolution of the individual and continuous targets have been improved by about 4 times and 9 times, the peak signal-to-noise ratio (PSNR) has been increased by about 2 times and 3 times, respectively. The experimental results indicate that the proposed imaging method may gradually adapt to existing beam scanning imaging systems. It will be beneficial for the widespread application of high-resolution imaging in large fields of view.