US Patent 9065972 User face capture in projection-based systems

A projector based user interface unit is described for implanting an interactive workspace. The interface unit projects a graphical workspace onto a display surface and monitors user interactions with the workspace. A mirror is placed on or near the workspace to reflect the face of the user to the interface unit. The interface unit captures the mirrored face of the user and provides images of the face of the user to other users for use in conjunction with collaborative techniques such as video conferencing or content sharing.