Facsimile and static presentation processing – Static presentation processing – Attribute control
Patent
1986-12-31
1988-05-10
Britton, Howard W.
Facsimile and static presentation processing
Static presentation processing
Attribute control
358135, 358138, 358 3, 358 91, 358 92, H04N 1300, H04N 712
Patent
active
047439653
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The present invention relates to a stereoscopic television picture transmission system in which a stereoscopic television signal having compressed a frequency band is transmitted or recorded, and more particularly to a stereoscopic television picture transmission system for displaying a high definition television picture by performing subsampling with consideration being given to the time-frequency characteristic of the visual parallax sensed by a human being in the depth direction of a picture.
When an image having a three dimensional appearance is reproduced, two television signals corresponding to the fields of view of by the left and right eyes of a human being are required.
So far, in order to reproduce a three-dimensional image, it has been necessary to simultaneously transmit two video signals and to perform synchronous recording and reproduction by using two VTRs. However, the prior art system described above has a problem in terms of increased cost, since the transmission lines must be doubled and two VTRs must be additionally there are various disadvantages such as providing precision circuits and devising a transmission system for representing subtle parallax.
Therefore, in order to compress two stereoscopic television signals, corresponding to the right and left eyes, into a frequency band of the conventional one channel television signal for transmission there is proposed a system in which a difference signal that is, a parallax signal with respect to the right and left picture signals-is compressed for transmission by utilizing the degree of correlation between the right and left pictures. That is, parallax between the right and left pictures exists only in a near-distance view (for instance, an object within 10 meters from the cameras) and does not exist in the case of a long-distance view, so that the difference signal is produced only when parallax exists. Therefore, it is considered to compress and transmit the difference signal by effecting a time-axis compression of a time interval in which no parallax exists.
However, the difference signal originally includes many high frequency components of 1-2 MHz so that when the difference signal is compressed in the manner described above, the limitation of the differential signal band adversely affects the generation of a quality stereoscopic picture.
SUMMARY OF THE INVENTION
In view of the above, one of the objects of the present invention is to provide a stereoscopic television picture transmission system which substantially eliminates the causes for degrading the quality of pictures, and which compresses the stereoscopic picture signals into a conventional one channel television signal band, so that a high quality stereoscopic picture can be transmitted.
Another object of the present invention is to provide a sterescopic television picture transmission system for stereoscopic pictures, in which a picture which moves in the direction of depth (referred to as "a moving picture") and a picture which does not move in the direction of the depth (and which is referred to as "a still picture" including a picture which does not move in the direction of the depth even if it moves two-dimensionally) are subjected to different processings from the standpoint of visual characteristics so as to compress the frequency band occupied by the moving pictures. It then becomes possible to transmit a higher frequency component of the difference signal, whose transmission is difficult when the difference signal is merely compressed, and therefore a high definition stereoscopic picture can be displayed.
To this end, the present invention, utilizes the fact that the time-frequency the parallax in characteristics of visual perception of depth deteriorates considerably as compared with a still picture when the frequency is increased that is, in case of a moving picture so that depth perception by parallax is almost eliminated. That is, from the standpoint of visual perception, no problem arises even when the resolution in the direction
REFERENCES:
patent: 4323920 (1982-04-01), Collender
Isono Haruo
Yamada Mitsuho
Yasuda Minoru
Britton Howard W.
Kostak Victor R.
Nippon Hoso Kyokai
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