Historically, 3 methods have been used at HM.
This works well for people-sized objects, but we've also successfully scanned a boot and other similarly sized objects.
Line laser scanner
Dave built a Spinscan using a line laser unit and stepper motor to turn the object on a turntable and take synchronized video using a webcam. This works better for high detail on smaller objects, but takes care to setup light levels and geometry (cam height etc). It also needs a better enclosure for good scans.