English: Experimental setup for a spatial sweeping based high speed ghost imaging system. The laser beam is first collimated and expanded by lens #1 (L1) and lens #2 (L2), then enter the sweeping system which consists of galvanic mirror #1 (GM1) and galvanic mirror #2 (GM2). As the two galvanic mirrors rotate around the vertical axes, the beam sweeping the digital mirror device (DMD) along the horizontal direction. The beam is coded and reflected back by the DMD, through GM2 and GM1, then spitted by the beam splitter (BS) and projected onto the scene after being magnified to proper size by lens #3 (L3), and the beam is shaped by a square aperture (SA). The beam entering and leaving the DMD are labeled in light green and light orange colors respectively. Light encoding the scene information is collected by lens (L4) and then recorded by a photodiode (PD). The PD output and GM2’s rotating position are digitized by an analog-to-digital conversion card on the computer for further processing. GM1 and GM2 are set to rotate at the same frequency, amplitude and phase, which ensures the beam between GM2 and DMD being parallel with the beam entering GM1.