1. A structured light imaging (SLI) system, comprising: a projection system that is operable to project a single SLI pattern into an imaging area; an image sensor system that is operable to capture at least one image of a 3D object moving through the imaging area in a frame period, wherein the image sensor system outputs a subset of camera pixels in the frame period to generate a subwindow image; and a processing module that is operable to create a 3D surface map of the 3D object using the subwindow image.