Television – Stereoscopic – Signal formatting
Patent
1996-06-26
2000-03-21
Rao, Anand S.
Television
Stereoscopic
Signal formatting
348 45, 348 46, 348 47, 348 51, 348 52, H04N 718
Patent
active
060408529
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND
This application relates to a method and a device for the recording and reproduction of stereoscopic video images. One such method is disclosed in German Publication DE 41 34 033 C1. This method is disadvantageous in that the reproduction quality of the stereo images represented on the monitor is inadequate.
SUMMARY OF THE INVENTION
It is therefore an object of the invention to find a simple and reliable method and a device with which steroscopic video image reproduction quality is ensured.
U.S. Pat. No. 5,084,763 discloses a method and a device for displaying stereoscopic television pictures. The latter can be transmitted and recorded as fields using time-division multiplex, the changeover between left and right channels being performed during reproduction with the timing of a field period. Signal processing is undertaken separately for each channel, and the two channels are displayed on the monitor with double frequency in order to suppress flicker. Nothing is said as to how a distinction is achieved between the images of the right and left channels during reproduction by the VTR.
The video images are generated by two image-acquiring devices, both the signal of the camera assigned to the left eye and the signal of the camera assigned to the right eye having as usual even and odd fields. The invention also comprises an embodiment in which for the sake of simplicity only one field each is generated per image-acquiring device.
In a preferred exemplary embodiment, the signals of the two cameras are fed to an interface (video signal coupler) at whose output the even fields of one camera and the odd fields of the other camera are present successively in time. The output signal of the interface is fed to the recording device.
The assignment of the video fields in the reproduction of the recorded video signal has normally been rendered possible by an identifying signal added to the video signal during recording. This identifying signal has indicated the connection between even and odd fields and right and left cameras. In the reproduction of the recorded video signal, this identifying signal has been used to split the video signal into two channels, one for images assigned to the right eye and one for images assigned to the left eye. On the basis of the invention, this identifying signal is no longer mandatory and is therefore provided only in the case of a modified embodiment.
If, however, the identifying signal is not detected at the reproducing device, for example during a disturbance, the right-left separation of the reproduced video signal cannot be carried out satisfactorily. This problem is also eliminated by the invention. According to the invention, a method is specified in which the separation of the reproduced video signal is possible without the recording of an additional identifying signal.
Coupling a synchronization signal to a field achieves the advantage that this signal is directly a component of the video signal, with the result that detection is more easily possible than if it was a question of--as known--a separate signal.
One advantage of the invention resides in that the image acquiring devices detect and record by channel odd fields, on the one hand, and even fields, on the other hand. In each case, one field of the frames consisting of two fields is detected per channel and recorded in a recording device. For reproduction, the fields are further processed by channel and respectively fed to a raster image buffer which is preferably connected in each case to an interpolator for generating the missing field. After joining the image generated by the interpolator with the field already present in the raster image buffer, there is produced per channel a frame consisting of two fields which are read out by a frame grabber with 4-fold picture frequency and made available for reproduction to a reproducing monitor. Whereas the image acquiring devices acquire the frames or raster images with a picture frequency of, for example, 25 Hz, in the reproducing monitor frames or raster images
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patent: 4562463 (1985-12-01), Litpon et al.
patent: 5329365 (1994-07-01), Uz
patent: 5416510 (1995-05-01), Lipton et al.
patent: 5510832 (1996-04-01), Garcia
patent: 5539464 (1996-07-01), Xu et al.
Leica Microsystems AG
Rao Anand S.
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