60864041-52001696-3D-TV-PPT

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A SEMINAR ON 3D TV TECHNOLOGY PRESENTED BY RAKENDHU R EC-7 NO: 53

CONTENTS: 

INTRODUCTION BASICS OF 3D TV ARCHITECTURE OF 3D TV TECHNOLOGIES PRESENTLY USED MULTIVIEW AUTO STEREOSCOPIC DISPLAY APPLICATIONS OF 3D TV ADVANTAGES AND DISADVANTAGES CONCLUSION REFERENCES CONTENTS

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At first, films were silent, then sound was added; Cinema and television were initially black-and-white, then colour TV was introduced. Computer imaging and digital special effects have been the latest major novelty . Nowadays markets are flooded with HDTV,LCD & Plasma TVs. Three dimensional TV(3D TV) is expected to be next revolution in the TV history . INTRODUCTION

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Binocular parallax- Binocular parallax r efers to the ability of the eyes to see a solid object and a continuous surface behind that object even though the eyes see two different views. Motion parallax- It means information at the retina caused by relative movement of objects as the observer moves to the side (or his head moves sideways). Depth perception- It allows the beholder to accurately gauge the distance to an object. It is the visual ability to perceive the world in three dimensions. BASICS OF 3D TV

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Stereographic images- It means two pictures taken with a time separation that are then arranged to be viewed simultaneously. Stereoscope- It is an optical device for creating stereoscopic (or three dimensional) effects from flat (two-dimensional) images; D . Brewster first constructed the stereoscope in 1844 . Holographic Images- A luminous, 3D,transparent,coloured and nonmaterial image appearing out of a 2D medium, called a hologram .

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Acquisition Transmission Display Unit ARCHITECTURE OF 3D TV TECHNOLOGY

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The acquisition stage consist of an array of the hardware synchronized cameras. CCD image Sensors MPEG-2 Encoding PCI card. Acquisition

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Gigabit Ethernet A transmission technology, enables super net to deliver enhanced network performance. Transmission

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The receiver side is responsible for generating the appropriate images to be displayed. Display Unit

TECHNOLOGIES USED: 

TECHNOLOGIES USED Anaglyphic 3D: It provides a 3D effect when viewed with 2 colour glasses (each lens a chromatically opposite colour, usually red and cyan). Images are made up of two colour layers, but they are offset with respect to each other to produce a depth effect. Usually the main subject is in the centre, while the foreground and background are shifted in opposite directions.

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Polarization 3D: Two images intended for each eye are displayed from two separate projectors. Each image is projected with a polarization mutually orthogonal to the other polarization. Polarized 3D Glasses are then used with polarized filters to ensure that each eye receives only the intended image. Each eye perceives a different image resulting in the 3D effect.

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Alternate-frame Sequencing: The movie is filmed with two cameras. Then the images are placed into a single strip of film in alternating order. The film is then run at 48 frames-per-second. Each eye's glass contains a liquid crystal layer which has the property of becoming dark when voltage is applied, being otherwise transparent.

AUTOSTEREOSCOPIC DISPLAYS : 

AUTOSTEREOSCOPIC DISPLAYS H olographic Displays: The holographic image is true three-dimensional. It can be viewed in different angles without glasses Volumetric Displays: It creates 3-D imagery via the emission, scattering, or relaying of illumination from well-defined regions in (x,y,z) space. Parallax Displays: It emits spatially varying directional light. The panoramagram , invented in 1824, is an instrument used to obtain the illusion of depth on a flat surface

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L enticular Display: the lenticular sheet is a line of array of narrow cylindrical lenses called lenticules . The purpose of the lenses is to focus more of the light into a horizontal beam and allow less of the light to escape above and below the plane of the viewer. Multi-projector Lenticular Display: H. Ives invented the multi-projector lenticular display in 1931. The large number of views & the large physical display lead to a very immersive 3D display. For rear-projection system two lenticular sheets are mounted back-to-back with optical diffuser material in the center.

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The front projection system uses only one lenticular sheet with a retro-reflective front projection screen material from flexible fabric mounted on the back.

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In the field of medicine, education. Commerce, Museum. In Engineering field for Simulation and Visualization. Entertainment and Gaming. Military and Communication field. Richer ,Lifelike and entertaining experience than 2D TV for home users. APPLICATION OF 3D TV TECHNOLOGY

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DISADVANTAGES : Greater 3D experience requires glasses to be worn while viewing. No defined industry standard for 3D hardware, software & TV components. High production and transportation costs of 3D video information. Health problems may occur.

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Thus we have seen various technologies used for 3D imaging and viewing. We also explained technology of 3D TV, discussed various aspects and features of 3D TV . Another area of future research is precise colour reproduction of natural scenes on multiview displays. In future we will be able to touch and smell the objects being projected from a screen to the viewers. CONCLUSION

REFERENCES : 

REFERENCES http://www.google.com http://www.scribd.com http://www.wikipedia.com http://www.3D-TV.info http://www.3dglasses.net

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