Projection device for projecting image of e.g. virtual keyboard switch, has projector to receive image signal from video camera via mixing device e.g. electronic computer, which controls phase position and amplitude of signal

摘要

The device has a platform (3) including a video camera (1) and a projector (2). The projector receives an image signal from the camera through a mixing device (5) e.g. electronic computer. The mixing device controls phase position and amplitude of the image signal. The projector projects the image signal onto a projection surface (4) that is horizontally fixed.