Facsimile and static presentation processing – Static presentation processing – Attribute control
Patent
1982-06-15
1985-09-10
Britton, Howard W.
Facsimile and static presentation processing
Static presentation processing
Attribute control
358 88, 358102, 358 91, 358 92, 350130, 354101, 354112, H04N 960, H04N 954, H04N 708
Patent
active
045410070
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
This invention relates to a stereoscopic color television transmitting and receiving system which uses a lenticular screen.
BACKGROUND ART
In various countries of the world, attempts have been made to provide a stereoscopic color television transmitting-receiving system. None of them has brought a satisfactory result, however. In order to make a new system compatible with the existing systems such as NTSC, SECAM or PAL system, it is necessary to shut out ordinary light so that a holographic, stereoscopic picture may be taken and then transmitted. For the same purpose it is also necessary to solve many problems, such as protection of the human body against laser beams. All in all, it seems almost impossible at present to make the bandwidth of a required carrier wave fall within the bandwidth of the existing systems.
It is easy to provide a system which uses two cathode ray tubes of the same size for reproducing two pictures in a stereoscopic relation, and two polarized glass filters which are disposed on the screens of the cathode ray tubes and different in phase by 90.degree.. Through the glass filters and through polarized eyeglasses a stereoscopic picture may be seen by both eyes of a viewer. But the receiver is inevitably bulky, and the viewer cannot see a stereoscopic picture unless he wears polarized eyeglasses.
Other two-picture systems, a complementary color picture system and a synchronized liquid crystal eyeglass system, are under development. Either system needs specially designed eyeglasses or a viewing aid. Without wearing the special eyeglasses or using the viewing aid, a viewer cannot see a stereoscopic picture.
An attempt has been made to provide a system which uses a lenticular screen in combination with two stereoscopic pictures so that a viewer may watch a stereoscopic picture without wearing a specially designed viewing aid. (For example, U.S. Pat. No. 3,674,921 discloses such a system.) The system is theoretically unworkable. A viewer can watch a stereoscopic picture only when he stands in front of the screen. If he stands at other positions, he can watch but a flat picture or, in worst case, a pseudoscopic picture in which far and near are replaced with each other. This system is therefore not practical.
DISCLOSURE OF INVENTION
It is an object of the invention to provide a stereoscopic color television system which is compatible with the existing monochrome or color television systems, which uses only one cathode ray tube provided with one set of color electron guns and which can yet produce a stereoscopic picture that a viewer can see from any direction at the front of the cathode ray tube without wearing special eyeglasses or using a viewing aid.
Another object of the invention is to provide a stereoscopic color television system which enables simultaneous transmission and reception of five picture signals taken by five cameras arranged in a stereoscopic relation.
It is desired that as many pictures as possible be arranged in the form of stripes below the focal plane of the lenticular lenses constituting the lenticular screen of a stereoscopic color television receiver. But five pictures are good enough. This may be proved true by the fact that stereoscopic color pictures available on the market are each composed of five pictures.
U.S. Pat. No. 4,164,748 (Japanese Patent Application No. 51-35114, Disclosure (Kokai) No. 52-119818), of which the inventor hereof is the owner, discloses a system which not only is compatible with the existing monochrome and color television systems but also provides a picture whose density seen by a single eye and whose color rendering are equal to those provided by the existing systems. Nonetheless, the system is disadvantageous in the following two respects because it employs sequential transmission method.
1. If a picture is transmitted by said system and received by receivers for the existing system, since pictures in stereoscopic relation are superposed one upon another, the more stereoscopic the picture is, the more blurred th
REFERENCES:
patent: 3674921 (1972-07-01), Goldsmith
patent: 3688045 (1972-08-01), Olakoshi
Britton Howard W.
Peng John K.
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