Television – Stereoscopic – Stereoscopic display device
Patent
1993-06-21
1996-07-30
Britton, Howard W.
Television
Stereoscopic
Stereoscopic display device
359464, H04N 1304
Patent
active
055416420
DESCRIPTION:
BRIEF SUMMARY
This invention relates to imaging systems of the type described in our International patent applications Nos. WO90/13848 and PCT/GB91/01318 to which reference should first be made.
International patent application No. WO90/13848 there is described a system in which a stereoscopic pair of images are displayed on a screen with a lateral shift between the two images and a decoder screen is provided whereby a viewer can see one image of the pair with the right eye and the other image of the pair with the left eye. The images are displayed as, for example, a series of alternating vertical stripes of the two images. The decoder screen comprises a series alternating opaque and transparent vertical stripes arranged such that the left eye will see the vertical stripes of one image of the stereoscopic pair through the transparent stripes whilst the black stripes mask the stripes of the second image of the pair. The right eye will see the second image of the pair through the transparent stripes whilst the black stripes mask out the first image.
The images displayed may be a genuine stereoscopic pair derived from two cameras viewing a scene. Preferably a lateral shift between the images of the pair is used in displaying them upon the screen.
The system can also derive stereoscopic effects from a monoscopic source by displaying successive frames produced by the source simultaneously on the screen with a lateral shift between the two images. The relative displacement of moving objects in the scene creates a sense of depth for the viewer.
It has been proposed to use a lenticular grid in front of the screen on which the pair of images is displayed and carrying a pattern of alternating clear and opaque areas in contact with lenticular array whereby the apparent pattern of clear and opaque areas perceived by one of the viewer's eyes is the inverse of the apparent pattern perceived by the viewer's other eye. This raster lenticular hybrid decoder screen delivers two clear sharp images with the stereo differences contained between them one to each eye.
When using such an arrangement for display on a horizontally scanned raster screen such as a television screen complex software is required to produce the alternating vertical stripes of the two images of the pair. This is because each horizontal line has to be chopped at a plurality of positions across its width.
Preferred embodiments of the present invention provide an imaging system in which the horizontal scan of a video signal is used to slice the two images of the stereoscopic pair together.
Various aspects of the invention are defined in the appended claims to which reference should now be made.
Preferred embodiments of the invention will now described in detail by way of example with reference to the accompanying drawings:
FIG. 1 shows the horizontal patterns seen by the left and right eyes in an embodiment of the invention.
FIGS. 2A and 2B show the effect of showing the two images on alternate video fields;
FIGS. 3A and 3B schematically show the processing of 2-D source data for use in the invention;
FIGS. 4A and 4B schematically show a system embodying the invention;
FIG. 5 shows the images shown on a video screen in the embodiment of FIG. 4;
FIG. 6 shows a similar view to FIG. 5;
FIGS. 7A and 7B show polarizing filter caps for use in an embodiment of the invention;
FIGS. 8a, 8b and 8c show various sizes of the caps of FIG. 7;
FIG. 9 shows a checkerboard decoder for use with the filter caps of FIG. 7;
FIG. 10 shows how a 2-D source image is converted to a source image for use in embodiments of the invention;
FIG. 11 shows a horizontal grid decoder embodying the invention;
FIGS. 12A, 12B, 12C, 13A, 13B and 13C show the processing of source data for use in embodiments of the invention in more detail.
In television systems such as PAL and NTSC each frame of video data is displayed as a pair of interlaced fields on the screen. This arrangement is well known. This gives an ideal format in which a stereoscopic pair of images can be combined for display on a cathode ray tube
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Britton Howard W.
Delta Systems Design Ltd.
Weinstein Louis
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