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3D Television : Seminar Report and PPT


Definition of 3D Television

Three-dimensional TV 3D Television is expected to be the next revolution in the TV history. They implemented a 3D TV prototype system with real-time acquisition transmission, & 3D display of dynamic scenes. They developed a distributed scalable architecture to manage the high computation & bandwidth demands. 3D display shows high-resolution stereoscopic color images for multiple viewpoints without special glasses. This is first real time end-to-end 3D TV system with enough views & resolution to provide a truly immersive 3D experience.Japan plans to make this futuristic television a commercial reality by 2020as part of abroad national project that will bring together researchers from the government, technology companies and academia. The targeted "virtual reality" television would allow people to view high definitionimages in 3D from any angle, in addition to being able to touch and smell the objects being projected upwards from a screen to the floor .

Why 3D Television

  The evolution of visual media such as cinema and television is one of the major hallmarks of our modern civilization. In many ways, these visual media now define our modern life style. Many of us are curious: what is our life style going to be in a few years? What kind of films and television are we going to see? Although cinema and television both evolved over decades, there were stages, which, in fact, were once seen as revolutions:

1) at first, films were silent, then sound was added;

2) cinema and television were initially black-and-white, then color was introduced;

3) computer imaging and digital special effects have been the latest major novelty.


This is a brief explanation that we hope sorts out some of the confusion about the many 3D display options that are available today. We'll tell you how they work, and what the relative tradeoffs of each technique are. Those of you that are just interested in comparing different Liquid Crystal Shutter glasses techniques can skip to the section at the end. Of course, we are always happy to answer your questions personally, and point you to other leading experts in the field. They use 16 NEC LT-170 projectors with 1024'768 native output resolution. This is less that the resolution of acquired & transmitted video, which has 1300'1030 pixels. However, HDTV projectors are much more expensive than commodity projectors. Commodity projector is a compact form factor. Out of eight consumer PCs one is dedicated as the controller. The consumers are identical to the producers except for a dual-output graphics card that is connected to two projectors. The graphic card is used only as an output device. For real-projection system as shown in the figure, two lenticular sheets are mounted back-to-back with optical diffuser material in the center. The front projection system uses only one lenticular sheet with a retro reflective front projection screen material from flexible fabric mounted on the back. Photographs show the rear and front projection.

The projection-side lenticular sheet of the rear-projection display acts as a light multiplexer, focusing the projected light as thin vertical stripes onto the diffuser. Close up of the lenticular sheet is shown in the figure 6. Considering each lenticel to be an ideal Pinhole camera, the stripes capture the view-dependent radiance of a threedimensional light field. The viewer side lenticular sheet acts as a light de-multiplexer & projects the view-dependent radiance back to the viewer. The single lenticular sheet of the front-projection screen both multiplexes & demultiplexes the light. The two key parameters of lenticular sheets are the field-of-view (FOV) & the number of lenticules per inch (LPI). Here it is used 72" ' 48" lenticular sheets with 30 degrees FOV & 15 LPI. The optical design of the lenticules is optimized for multiview 3D display. The number of viewing zones of a lenticular display is related to its FOV. For example, if the FOV is 30 degrees, leading to 180/30 = 6 viewing zones

This system is the first to provide enough view points and enough pixels per view points to produce an immersive and convincing 3D experience. Another area of future research is to improve the optical characteristic of the 3D display computationally. This concept is computational display. Another area of future research is precise color reproduction of natural scenes on multiview display.

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