Patent ID: 6201579
Filing Date: 2001-03-13
Classification: H04N

Abstract:
A virtual studio positioning system for a virtual studio comprisinga chroma-key background panel,a television camera situated in a defined front studio area in front of the background panel for imaging a foreground object in front of the background panel,at least one fixed mounted detection unit, said fixed detection unit having a field of view to cover the defined front studio area,an emitting device mounted in a fixed relationship with respect to the television camera or foreground object, said fixed detection unit receiving emissions from said emitting device, and producing a detection output signal,processing means for processing the detection output signal of the fixed detection unit to provide at least x and y co-ordinates for the television camera or foreground object in relation to its position in the defined front studio area,wherein the emitting device comprises an LED that is not continuously on but is switched on for a defined time period and produces an LED output that comprises a coded emissions, the detection device is also gated to receive emissions during a further defined period which is synchronous to the defined time period, the defined time period is shorter than the further defined time period, and both periods are synchronized to a frame synchronization of the virtual studio.