| 摘要 |
This invention discloses a Pulfrich Filter Spectacles through which any 2-dimensional motion picture with passages of horizontal screen movement can be viewed with a 3-dimensional visual effect. It provides a system of timed signals to move a Pulfrich filter before one eye or the other as appropriate to the current direction of screen foreground movement. The Pulfrich Filter Spectacles achieve this by taking advantage of the well-known Pulfrich effect, by which lateral motion of an ordinary motion picture will appear to the viewer in 3-dimensions if the motion picture is viewed through right and left filter lenses that are configured with a clear lens and an occluded or tinted lens. In the preferred embodiment, this is implemented by modifying the soundtrack of a movie to include sounds beyond human hearing (ultrasonic sounds) that signal at appropriate places/times in the course of presentation of a motion picture to switch the filter to the appropriate eye. The preferred embodiment provide Pulfrich Filter Spectacles with no moving parts and no wire connections using material that partially occludes or entirely clears in response to the received electronic signals. This electronic adaptation of Pulfrich filtering will allow almost any motion picture to be viewed effortlessly by the viewer with the visual effect of 3-dimensions.
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