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jaijan · 10-04-2017, 08:25 PM

Tele-Immersion will enable users at geographically distributed sites to collaborate in real time in a shared, simulated environment as if they were in the same physical room. The idea of Tele-immersion was proposed by Jaron Lanier, the head of Advanced Networks and Services in 1997. National Tele-Immersion Initiative (NTII) was formed to implement this. ? In May 2000, researchers at University of North Carolina (UNC), the University of Pennsylvania and Advanced Networks and Services developed this technology. ? A user sitting in office at UNC was able to see lifelike 3D images of his colleagues hundreds of mile away. ? ? ? ? ? Bank of digital cameras capture participants from a variety of angles. There are about 7-15 camera clusters each contains 4 cameras out of which 3 are black and white and one is color. B&W cameras are for stereo construction. The color camera is for extracting the appearance. Three Camera Views Each camera is synchronized to other cameras in the same bus. Each camera unit is connected to a workstation. Machines in the workstation are dual boot with Linux and Windows 2000. The scene is illuminated by imperceptibly structured light. 4 microphones and 4 speakers are used for sound. Each set of images taken at a given instant is sorted into subsets of overlapping trios of images. From each trio of images a disparity map is calculated, reflecting the degree of variation among the images at all points in the visual field. ? Disparities are analyzed to yield depth. ? All depth maps are combined into a single view point sculptural model of the scene at a particular moment ? This Reconstruction uses Trinocular Stereo Algorithm. ? After constructing the disparity map, apply median filtering to remove a few outliers in the disparity map. ? Then the median filtered disparity map is combined with a registered color texture to reconstruct a 3D point cloud. ? Each pixel have 5 bytes out of which 2 bytes for depth information and 3 for color of the pixel. Why?.. If the background is stationary, no need to reconstruct at each time frame. Reconstruct the background scene in advance of the session and transmit it once to the remote sites. System, which generates 640 480 pixel depth color maps from 10 camera clusters in a rate of 15 frames per second (fps), requires a 220mbps bandwidth. Around 1.2gbps is necessary for high quality effects!! ? 3D point cloud is skeletonized ? Skeletonized data and the residuals are send to the destination. and decompression are done using Modern Driven compression algorithm. ? Compression (a) (b) © (d) (e) Reconstructions from the compressed data and their differences with the uncompressed data. (a) Uncompressed data. (b) Compressed with 50% residuals. © Difference between (a) and (b). (d) Compressed with 100% residuals. (e) Difference between (a) and (d). Color Reduction scheme 3 byte color information is reduced to 1 byte. A color map is send along with the data. 1 byte is for representing color index. ? JPEG scheme Change video into JPEG form. Motion JPEG uses JPEG still image compression on each frame separately. Sacrifice quality ? Visual quality before color compression ? Visual quality after color compression Telecubicle : Consists of two stereo immersive wall surfaces and a stereo immersive desk surface. These three display surfaces join to form a corner desk unit. Walls appear as windows to other users environment and desk forms a virtual conference table. CAVE 10 foot-cubed room that is projected with stereoscopic images creating illusion that objects appear to co-exist with the user in the room ImmersaDesk Small, drafting table like system capable of projecting stereoscopic images. ? The software for implementing Trinocular Stereo Algorithm and Modern Driven Compression algorithm is CAVERNsoft. ? CAVERNsoft is a C++ toolkit. ? Work across SGI, Linux, Solaris and Win32 platforms. ? Next Generation Internet initiative to dramatically advance the speed and quality of the Internet s infrastructure and thus the ability to evolve new applications. ? Provide high bandwidth. ? A mark of around 8.8 gigabits per seconds was set on April 26, 2006 . ? Remote medical diagnosis and therapy. ? Distributed decision making. ? Remote and distributed education. ? Distributed artistic performance and interaction. ? Virtual travel and tourism. ? Automobile Engineering. ? Application continues No need to travel long distance in order to conduct business meetings. A geographically distanced surgeon could be teleimmersed into an operation theater. This could be lifesaving! Scene from original surgery Captured scene rendered from reconstructed 3D geometry with annotations and trainee's hands mimicing the surgeon Automobile designers from different continents could design new generation vehicles. ? Dancers from different countries could train together, dance together. ? Dance with yourself! Quality of transmitting multimedia and TeleImmersion data streams over the Internet is affected by high packet loss rates. Solution: FEC/UDP. Expensive. High bandwidth requirement. Tele-Immersion provides natural interaction to the remote world. In the tele-immersive environment, computers recognize the presence and movements of individuals and objects and then permit them to be projected in realistic, multiple, geographically distributed immersive environments where individuals can interact with each other and with computer generated models.

ramu · 10-04-2017, 08:25 PM

Definition
Tele-Immersion is a new medium that enables a user to share a virtual space with remote participants. The user is immersed in a 3D world that is transmitted from a remote site. This medium for human interaction, enabled by digital technology, approximates the illusion that a person is in the same physical space as others, even though they may be thousands of miles distant. It combines the display and interaction techniques of virtual reality with new computer-vision technologies. Thus with the aid of this new technology, users at geographically distributed sites can collaborate in real time in a shared, simulated, hybrid environment submerging in one another's presence and feel as if they are sharing the same physical space.

It is the ultimate synthesis of media technologies:
1.3D environment scanning,
2.projective and display technologies,
3.tracking technologies,
4.audio technologies,
5.robotics and haptics, and powerful networking. The considerable requirements for tele-immersion system, make it one of the most challenging net applications.

In a tele-immersive environment computers recognize the presence and movements of individuals and objects, track those individuals and images, and then permit them to be projected in realistic, multiple, geographically distributed immersive environments on stereo-immersive surfaces. This requires sampling and resynthesis of the physical environment as well as the users' faces and bodies, which is a new challenge that will move the range of emerging technologies, such as scene depth extraction and warp rendering, to the next level.

Tele-immersive environments will therefore facilitate not only interaction between users themselves but also between users and computer generated models and simulations. This will require expanding the boundaries of computer vision, tracking, display, and rendering technologies. As a result, all of this will enable users to achieve a compelling experience and it will lay the groundwork for a higher degree of their inclusion into the entire system
Tele-immersive systems have potential to significantly change educational, scientific and manufacturing paradigms. They will show their full strength in the systems where having 3D reconstructed 'real' objects coupled with 3D virtual objects is crucial for the successful fulfillment of the tasks. It may also be the case that some tasks would not be possible to complete without having such combination of sensory information. There are several applications that will profit from tele-immersive systems. Collaborative mechanical CAD applications as well as different medical applications are two that will benefit significantly.

Tele-immersion may sound like conventional video conferencing. But it is much more. Where video conferencing delivers flat images to a screen, tele-immersion recreates an entire remote environment. Although not so, tele-immersion may seem like another kind of virtual reality. Virtual reality allows people to move around in a pre-programmed representation of a 3D environment, whereas tele-immersion is measuring the real world and conveying the results to the sensory system.ultimate synthesis of media technologies:

A tele-immersion telecubicle is designed both to acquire a 3D model of the local user and environment for rendering and interaction at remote sites, and to provide an immersive experience for the local user via head tracking and stereoscopic display projected on large scale view screens.

archie · 10-04-2017, 08:25 PM

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Introduction
Tele-immersion may be the next major development in information technology. Using tele-immersion, you can visit an individual across the world without stepping a foot outside.

What is tele-immersion?
Tele-Immersion is a new medium that enables a user to share a virtual space with remote participants. The user is immersed in a 3D world that is transmitted from a remote site. This medium for human interaction, enabled by digital technology, approximates the illusion that a person is in the same physical space as others, even though they may be thousands of miles distant. It combines the display and interaction techniques of virtual reality with new computer-vision technologies. Thus with the aid of this new technology, users at geographically distributed sites can collaborate in real time in a shared, simulated, hybrid environment submerging in one another s presence and feel as if they are sharing the same physical space.

It is the ultimate synthesis of media technologies:
3D environment scanning,
projective and display technologies,
tracking technologies,
audio technologies,
robotics and haptics,
and powerful networking. The considerable requirements for tele-immersion system, make it one of the most challenging net applications.
In a tele-immersive environment computers recognize the presence and movements of individuals and objects, track those individuals and images, and then permit them to be projected in realistic, multiple, geographically distributed immersive environments on stereo-immersive surfaces. This requires sampling and resynthesis of the physical environment as well as the users' faces and bodies, which is a new challenge that will move the range of emerging technologies, such as scene depth extraction and warp rendering, to the next level.
Tele-immersive environments will therefore facilitate not only interaction between users themselves but also between users and computer generated models and simulations. This will require expanding the boundaries of computer vision, tracking, display, and rendering technologies. As a result, all of this will enable users to achieve a compelling experience and it will lay the groundwork for a higher degree of their inclusion into the entire system
Tele-immersive systems have potential to significantly change educational, scientific and manufacturing paradigms. They will show their full strength in the systems where having 3D reconstructed real objects coupled with 3D virtual objects is crucial for the successful fulfillment of the tasks. It may also be the case that some tasks would not be possible to complete without having such combination of sensory information. There are several applications that will profit from tele-immersive systems. Collaborative mechanical CAD applications as well as different medical applications are two that will benefit significantly.

Tele-immersion may sound like conventional video conferencing. But it is much more. Where video conferencing delivers flat images to a screen, tele-immersion recreates an entire remote environment. Although not so, tele-immersion may seem like another kind of virtual reality. Virtual reality allows people to move around in a pre-programmed representation of a 3D environment, whereas tele-immersion is measuring the real world and conveying the results to the sensory system.

hnikhra · 10-04-2017, 08:25 PM

Tele-Immersion
Tele-Immersion or the use of holographic environments is the next step to internet video conferencing. This technology aims to produce a computer-generated central environment in which participants from anywhere in the world can interact as if they are in the same room. This technology goes far beyond the current technological combination of telephony and internet by videoconferencing to exchange data.
Tele-Immersion will be able to address the line-of-sight limitations of the current video conferencing technology. With the use of holographic environments, users will be able to have an unrestricted view of the other person's environment.
Creating a holographic environment will need several equipments. The first will be a computer that will recognize and track movements and presence of objects and people inside a room. This is essential in projecting the same images and movements to the other party using a surface that will be stereo-immersive.
The creation of holographic environments may seem a lot like virtual reality, but it's actually very different since virtual reality allows the user to move and manipulate objects in the virtual environment while tele-immersion does not. With the merging of these two technologies, users will be able to manipulate objects in a holographic environment without having to use virtual reality headgears, making for a very realistic computer-generated environment.
Tele-Immersion Technology History
During the early years of research on Tele-immersion by National Tele-Immersion Initiative or NTII and the University of North Carolina, users were required to wear a head device and special goggles to track the user's eye movements much like a virtual reality headgear.
To recreate the environment and depth, video cameras were used at the other end to track movements and capture light patterns to calculate the distances in the room. The images were then polarized and divided in order to present a different image to each eye at the rate of 3 frames per second. This is somewhat similar to the 3-D glasses we use in the movies.
However, because of the low refresh rate of the frames, the image appeared somewhat jerky. The project however was successful as on May 2000, several researchers located in the University of North Carolina were able to communicate with researchers from the University of Pennsylvania and Advanced Networks and Services using this technology. The two groups were able to communicate inside a room with of lifelike and three dimensional representations of their colleagues more than a hundred miles away.

Technologies Needed to Support the Holographic Environments of Tele-Immersion
Tele-Immersion is still far from being opened to the market. The major hurdles that the researchers have to overcome before this technology becomes a reality are an internet that is faster by a factor of 1000 than today's standards to enable the transfer of massive amounts of data, new display technologies like stereo immersive display capable of generating lifelike images, haptic sensors that would enable users to interact with the environment, and finally more powerful desktop computers capable of handling the necessary calculations and programs to support holographic environments.

Jithina Jose · 10-04-2017, 08:25 PM

Tele-Immersion is a new medium that enables a user to share a virtual space with remote participants. The user is immersed in a 3D world that is transmitted from a remote site. This medium for human interaction, enabled by digital technology, approximates the illusion that a person is in the same physical space as others, even though they may be thousands of miles distant. In a tele-immersive environment computers recognize the presence and movements of individuals and objects, track those individuals and images, and then permit them to be projected in realistic, multiple, geographically distributed immersive environments on stereo-immersive surfaces.Tele-immersion techniques can be viewed as the building blocks of the office of tomorrow, where several users from across the country will be able to collaborate as if they're all in the same room. Scaling up, transmissions could incorporate larger scenes, like news conferences, ballet performances, or sports events. With mobile rather than stationary camera arrays, viewers could establish tele-presence in remote or hazardous situations.

nvsandeep · 10-04-2017, 08:25 PM

Tele-immersion is a technology to be implemented with Internet2 that will enable users in different geographic locations to come together in a simulated environment to interact. Users will feel like they are actually looking, talking, and meeting with each other face-to-face in the same room.

This is achieved using computers that recognize the presence and movements of individuals and objects, tracking those individuals and images, and reconstructing them onto one stereo-immersive surface.

3D reconstruction for tele-immersion is performed using stereo, which means two or more cameras take rapid sequential shots of the same object, continuously performing distance calculations, and projecting them into the computer-simulated environment, as to replicate real-time movement.

Tele-immersion presents the greatest technological challenge for Internet2.

vaisakh · 10-04-2017, 08:25 PM

saboorali · 10-04-2017, 08:25 PM

I'm neethu,i want detailed description of the working of the topic tele-immersion,so that i can explain in seminars..(about the positioning of cameras,n hw the images r generated..n displayed at the other end)

I'l be thankful if u can send ppt of the same topic..so that i can refer n do,my own..

mailinvinay · 10-04-2017, 08:25 PM

Hey, thanks for posting the info. A full report of this topic is available in this thread :
http://seminarsprojects.net/Thread-tele-...2#pid10362
cheers!

ekisper · 10-04-2017, 08:25 PM

please sir can you provide full report,ppt of this topic