An imaging system for forming multiple superimposed image exposure frames on a photoconductive member (22) moving in a process direction including a rotating polygon (26) having a plurality of facets (25). A raster output scanner forms a plurality of scanlines in a transverse direction across the photoconductive member (23) by reflecting modulated beams from the rotating polygon (26). A method of re-phasing the relationship between the beginning of scanlines and the rotating polygon by sensing a photoconductive member indicator (Tn) for registering images on the photoconductive member, detecting the beginning of scanlines and providing a start of scan (SOS) signals representing the detection, determining the relative phase between the start of scan signals and the detection of the indicator, and changing the speed of the rotating polygon (26) to synchronize the phase of the indicator with the lead edge of the SOS signals. <IMAGE>
Subpixel misregistration correction by means of ros rephasing a multiphase image on an image color printer