The process of reverse engineering using 3D scanning can yield many outputs and there is certainly some confusion between them. I hope this brief explanation of options can help set you down the correct path for your needs.
Originally developed to acquire raw images from analog machine vision cameras, frame grabbers were once expected to be replaced by direct-to-PC technologies. Experience has, however, been otherwise.
Frame grabbers were developed in the early days of machine vision to provide a connection from analog cameras providing NTSC and PAL output signals to minicomputers requiring digital signals placed directly on data buses for digital memory storage.