Technical Description
The technical challenge for "Hallucination" was figuring out how to accurately separate people out from within a video image without using a blue screen background. At the time this had never been done before as far as I knew. Obviously computers were too slow at the time to be able to do this, so I developed my own hardware to solve the problem.
One major component of the system hardware is the video difference keyer which looks at the pixel by pixel difference between a frozen video image of the empty room (stored every morning) and the live image and creates a key signal from this difference.
(Jim Campbell)
Hardware / Software
50" rear projection 4x3 video monitor, b&w camera, 2 laser disc players, custom designed image processing electronics, Mac+ computer, Hypercard (since updated to PC and C++) (computer is just used as a sequencer)