Large screen projection of synthesised images - using alternate fast TV line sweep to establish basic image and random sweep for equal brightness contours and isolated points

摘要

The system for projecting synthesised images on a plane or spherical screen (3) uses a computer (1) for synthesising the image signal and an operator console (2) for supplying additional information. The signal is applied through an electronic control circuit (5) and the amplifier (6) to a projector (4). Feedback from a viewer is provided by a viewer console (7). The image is screened using two types of alternate sweeps. The first is post t.v. type sweep which establishes the base of the image. The second rests the contours of different areas of equal light intensity of the image and of isolated points with the aid of a random sweep. The two sweeps are sufficiently first to be integrated by the human eye. The projector (4) uses three TITW tubes for the three colours red, green and blue. The control circuit (5) calculates the necessary corrections in sweep.