3D TV
3D TV is the abbreviation for 3D television and thus for television transmission of video signals separately for the left and right eye , so that the impression of spatial depth is created.
The video signal has already been recorded separately using the stereoscopic method and can be embedded in the television signal to the viewer at home in several ways. With the advent of color television , stereoscopic content was broadcast anaglyph . To do this, the video signal is freed of the red color component for one eye and the cyan color component for the other eye and then superimposed again. Red-cyan 3D glasses are required for viewing , but other color combinations can also be used, e.g. B. Magenta Green. Cyan corresponds to turquoise and is the complementary color to red. Magenta corresponds to "pink" and is the complementary color to (light) green.
If both video signals are to be displayed in full color in stereo 3D, the image must first be processed again in real time. There are two techniques for doing this:
In the line-sequential (English: interlaced) 3D rendering method with circular polarization, simple polarization glasses separate the left image (e.g. left-handed polarized) and the right image. The vertical resolution is halved with this technique, since each eye is only shown every second line. In other words: every even field (half image) shows the image for one eye, every odd field the other image. (This also makes it possible to display only one video signal, which means that the familiar 2D image remains in half the resolution.) The color accuracy is retained, but the periodic filtering can lead to fatigue effects on the audience. This type of transmission (field-sequential) is not used in regular TV operation, but only with "Interlace-3D" BluRay discs and with some video projectors (beamers).
The worldwide used HD-compatible 3D TV variant with two anamorphically compressed video streams in one HD channel is called "side-by-side", or SBS for short. The horizontal resolution is halved when the 3D video stream is created, since each half of the image only receives every other column. SBS can be received by any HDTV receiver and forwarded to a modern 3D-ready TV or 3D projector, which rectifies the two partial images to the full 16: 9 format and superimposes them with 100 or 120 Hz frame rate. The LCD shutter glasses required for the 3D separation are synchronized by an additional infrared transmitter with different parameters depending on the 3D TV manufacturer.
From 2009 to 2011, the satellite operator Eutelsat broadcast a test transmitter with stereo 3D material and the like on Eurobird 9. a. from Sensio . Also, SES Astra operational since May 5, 2010 to 23.5 degrees East a free to air channel demo with three-dimensional content, now only on Astra 19 degrees East. Sky Deutschland has been broadcasting a 3D TV channel on Astra 19 degrees east, 12382 MHz hor., SR 27500, FEC 9/10, DVBS2, QPSK since October 3, 2010, which mostly shows unencrypted 3D demos during the day. The broadcasting of Sky HD Fan Zone and Sky 3D was discontinued on June 25, 2017 and July 1, 2017 due to a lack of demand.
At ServusTV , a short stereo 3D film with a ski run in the Alps is sometimes broadcast at night using the ColorCode process , which is a more modern variant of the color anaglyphs with yellow-blue 3D glasses.
See also
Web links
Wikinews: Category: 3DTV - In The NewsIndividual evidence
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↑ Wikinews: Weekly overview: 3D video on the move for devices, TV channels and video consoles - 3DTV on EutelSat (August 2, 2009)
- ↑ 3DTV on Astra: 3D-TV: free demo channel on Astra 23.5 degrees east ( memento from October 29, 2013 in the web archive archive.today ) (3dtv-blog.de on May 5, 2010)
- ↑ sky.de: Sky HD Fan Zone and Sky 3D are no longer broadcasting - Sky - Help Center. (No longer available online.) Archived from the original on August 20, 2017 ; accessed on August 20, 2017 (German). Info: The archive link was inserted automatically and has not yet been checked. Please check the original and archive link according to the instructions and then remove this notice.
