  We demonstrate photon-counting single-pixel imaging in the ultraviolet
region. Toward this target, we develop a high-performance compact single-photon
detector based on a 4H-SiC single-photon avalanche diode (SPAD), where a
tailored readout circuit with active hold-off time is designed to restrain
detector noise and operate the SPAD in free-running mode. We use structured
illumination to reconstruct 192$\times$192 compressed images at a 4 fps frame
rate. To show the superior capability of ultraviolet characteristics, we use
our single-pixel imaging system to identify and distinguish different
transparent objects under low-intensity irradiation, and image ultraviolet
light sources. The results provide a practical solution for general ultraviolet
imaging applications.
