3dtv.pptx

3-DIMENSIONAL TELEVISION

ATTEST project-2002, Information Society Technologies (IST) program,

European commission.

GOALS

• CONTENT CREATION • COMPRESSION AND CODING • TRANSMISSION • 3D DISPLAYS

CONTENT CREATION

• 3D content is supplied by two methods:-

1. Novel 3d camera for static video.

2. Multiple cameras for dynamic video.

NOVEL 3D camera for static video

. The 3D-video camera that will be developed is based on Zcam™.

. it’s operation is based on

generating a "light wall" moving along the field of view.

(a) Light wall moving from camera to scene (b) Imprinted light wall back to camera (c) Truncated light wall containing depth

information from the source.

Output of depth camera

Multiple cameras for dynamic video

• The dynamic scenes are captured by using an array of hardware-synchronized cameras.

An array of 16 cameras and projectors used in ATTEST project.

CONVERSION FROM CONVENTIONAL 2D VIDEO

• Two types of conversion methods:-

1. offline conversion -use at content provider

side 2. online conversion -use at viewer side

COMPRESSION AND CODING

• Transmitting 16 uncompressed video streams with 1300×1030 resolution and 24 bits per pixel at 30 frames per second requires 14.4 Gb/sec bandwidth.

• reduce the data to a single view with per-pixel depth map. This data can be compressed in real-time and broadcast as an MPEG-2 enhancement layer.

Fig: The 3D TV uses the Layered Coding Syntax

3D DISPLAYS

• HOLOGRAPHIC DISPLAYS • VOLUMETRIC DISPLAYS • PARALLAX DISPLAYS • LENTICULAR DISPLAYS

1. Rear-projection 3D display with lenticular screen. 2. Front-projection 3D display with lenticular screen.

ADVANTAGES . shows high resolution of 1024 X 768 pixels of

stereoscopic color images for multiple viewpoints without special glasses.

• is completely scalable and backward compatible in the number of acquired, transmitted and displayed views.

. The large number of views (16) , and the large physical dimension ( 6’X4’ ) of the display lead to a very immersive 3D experience.

. The projector based 3D display has a native resolution of 12 million pixels which is greater than the largest currently available high resolution flat-panel screen of IBM T221 LCD with 9 million pixels.

• The overall delay in the system from the acquisition to the display is less than one second.

DISADVANTAGES

• The graphics cards and projectors are not synchronized which lead to and increased motion blur for fast movements in the scene.

• The Rear projection system has less quality compared to front projection system.

• Eye strain,headache and other unpleasant side effects.

APPLICATIONS

. Entertainment

. Medical field

. Tele-conferencing

Visualization of different structures of the Visible Male knee on the 3D-LCD monitor

FUTURE WORK

• Most of the key ideas for the 3D TV system presented in this paper have been known for decades.

• There is still much that we can do to improve the quality, sharpness, optical char. etc of the 3D display.

• They have to develope high-dynamic range cameras commercially.

• True high-dynamic range displays have also been developed

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