Making movies unwatchable

 作者:江塑邙     |      日期:2019-03-03 07:01:13
By Barry Fox The way to stop video pirates using camcorders to copy films in cinemas, Kodak claims, is to switch to a digital projection system that harnesses a new trick the company has dreamed up. Unlike a film projector, a digital projector directs red, green and blue light onto the screen separately, using computer-controlled mirrors. In US patent 2004/0150794, Kodak proposes introducing a flicker of around 100 hertz into these beams, using a slightly different frequency for each colour. Though the flicker is too rapid to be detectable by the human eye,