Television – Stereoscopic – Stereoscopic display device
Patent
1995-09-25
1998-09-01
Au, Amelia
Television
Stereoscopic
Stereoscopic display device
359458, 348 59, H04N 1300
Patent
active
058017615
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
1. Technical Field
The invention relates to a method and apparatus for producing three-dimensional picture, in particular to a three-dimensional television receiving system. The invention is also useful for other purposes, such as industrial planning and design.
2. Summary of the Prior Art
Video signals are recorded electronically or by other means, and may be displayed through a television system. The television receiver converts incoming television (video) signals into the original scenes or figures along with the associated sounds. The known two-dimensional television receivers comprise a picture tube having plane or arched fluorescent screen, producing a planar image by varying the electron-beam intensity as the beam, emitted by an electron gun, is deflected from side to side and up and down to scan a raster on the fluorescent screen at the other end of the tube. The fluorescent screen realizes a definite raster of segments, known as picture points or picture elements, arranged in scanning lines. The picture elements of the fluorescent screen are scanned point to point after each other by the electron beam, as the electron beam is moved by controlled horizontal and vertical deflection.
The issue of displaying true 3D scenes is not yet solved properly up-to-date. According to the present state of television technique 3D image reconstruction is exhausted at the level of displaying stereoscopic or autostereoscopic images. In these systems the three-dimensional effect is based on the deception of human perception (e.g. using special glasses) causing bad physiological effect. There are experimental systems which employ lenticular-lenses. By principle, these systems realize a resticted field of view and poor resolution.
A widely used method of three-dimensional optical image formation is the holography, a technique for recording and later reconstructing the amplitude and phase distributions of a wave disturbance. In optical image formation, the technique is accomplished by recording on a special photographic plate the pattern of interference between coherent light reflected from the object figure, and light coming directly from the same source or being reflected from a mirror. When the special photographic plate, known as hologram is developed and illuminated from behind by a coherent laser beam, it produces a three-dimensional image in space. Holography, however, is not a practical technique for producing three-dimensional picture from video signals.
OBJECTS OF THE INVENTION
An object of the invention is to provide a method which enables receiving three-dimensional video signals and producing real three-dimensional picture from them.
A further object is to develop an apparatus to realize the above method, i.e. an apparatus producing three-dimensional picture from the received 3D video signal, said apparatus being realizable with reasonable form and expenditure. An essential object of the invention is to achieve a three-dimensional television system by means of the suggested method and apparatus.
SUMMARY OF THE INVENTION
An essential feature of all kind of two-dimensional, planar images, e.g. paintings, photoes or picture of a usual television screen is that the intensity of light emitted or reflected from any point of the picture is independent, within a wide field of view, from the direction of the emitted or reflected light, i.e. a given picture point is the same viewed from every direction. On the other hand, a three-dimensional, spatial picture is characterized by picture points emitting or reflecting different light beams in every direction of the field of view, which means that the intensity (and colour) of a given picture point viewed from different directions depends on the viewing direction.
It has been found that a three-dimensional picture can be provided by means of a light emitting surface in which light beams are emitted from the picture points of said light emitting surface to many directions, wherein the intensity and colour of the light beam emitted from a
REFERENCES:
patent: 3566021 (1971-02-01), Jakes
patent: 4799103 (1989-01-01), Muckerheide
patent: 4829365 (1989-05-01), Eichenlaub
patent: 5132839 (1992-07-01), Travis
patent: 5253073 (1993-10-01), Crowley
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