Abstract— Tele-immersion is an advanced form of virtual reality that willallow users in different places to interact in real time in a shared simulatedenvironment.
This technology causes users to feel as if they were in the sameroom. The tele-immersiontechnology uses a “tele-cubicle” which is equipped with largescreens, scanners, sensors, and cameras. The tele-cubicles are linked togetherin real-time so that they form one larger cubicle.
Through the virtualenvironment, participants are able to interact with other group members. Also,virtual objects and data can be passed through the walls between participants,and placed on the shared table in the middle for viewing. Tele-immersion hasthe potential to significantly impact educational, scientific,manufacturing, and many other fields.Index Terms—Tele-immersion,large screens, sensors, cameras, real-time I.
INTRODUCTION 3D HUMAN AVATAR can be developed using theconcept of Teleimmersion , which is a technology that will be implemented withinternet2 it will enable users in different geographic locations to cometogether and interact in a simulated holographic environment. Users will feelas if they are actually looking, talking and meeting with each other face toface in the same place, even though they may be miles apart physically. In ateleimmersive environment, computer recognized the presence and movements ofindividuals as well as physical and virtual objects.
They can then track thesepeople and nonliving objects, and project them in a realistic way across manygeographic locations. The three steps toconstructing a holographic environment are: ?The computer recognizes the presence and movements of people andobjects.?The computer tracks those images.?The computer projects those images on a strereoimmersive surface. 3D reconstruction for teleimmersion is performed using stereo, whichmean two or more cameras rapid sequential shots of the same objects,continuously performing distance calculations, and projecting them into thecomputer. Simulated environment to replicate real time movements. By combiningcameras and Internet telephony, video conferencing has allowed real time exchangeof more information than ever, without physically bringing each person into onecentral room.
II. COMPONENTS OF A HOLOGRAPHIC ENVIRONMENT Teleimmersive displays of earlier daysrequired user to wear special goggles and a head device that tracked the viewpoint of the user looking at the screen. At the other end, the people, whoappeared as 3d image, where tracked with and array of 8 ordinary video cameraswhile three other video cameras captured real life patterns projected in eachroom to calculate distance.
This enabled the proper depth to the recreated onthe screen. So if an observer move here head to the left, she could see thecorresponding image that would be seen if she were actually in the room withthe person on the screen.Scientists are developing newtechnologies support this type of communication. Apart of these new technologies is: A. Telecubical: Users will communicate by using this technology.
It consist of aStereo immersive desk surface and two stereoimmersive wall surfaces. Thesethree display surfaces join to form a virtual conference table in the centre.This will allow the realistic inclusion of teleimmersion into the workenvironment, as it will take up the usual amount of desk space.B. Internet2: This will replace the current internet infrastructure. It is aconsortium made up of the US government, industry andacademia (180universities) that has been formed for creating tomorrow’sinternet.
This new network will have a higher bandwidth and speeds that are1000 times faster than today’s internet. This high bandwidth, high speedC. network is necessary totransfer the large amounts of data that teleimmersion will produce.D. Bandwidthissues: Network bandwidth requiredto make 3D-human avatar work is one of the main concerns of this newtechnology.
It is estimated that as much as 1.2 gigabits per sec will be neededfor future high quality effects. This is much higher than the average home connectionbandwidth. The exact amount of bandwidth needed for each scene depends on thecomplexity of the background. With time, the number of megabits used will fall as advanced compression techniques areestablished. A new network called the Grid could be a solution.
The Grid willuse distributed computing. There are not enough supercomputers to idealwith the enormous amount of data that will rush through the net in the future.As a solution, new network will connect their PCs so they can share processingpower and hard disk space.
They will be locked into a grid-effectively creatingone supercomputer.E. Displaytechnologies: stereo immersive displays wouldhave to present a clear view of the scenes being transmittedF. Haptic sensors: would allow to touchprojections as if they were real.G. Desktop supercomputers: would perform thetrillions of calculations needed to create a holographic environment.
A networkof computers that share power could also possibly support these environments. Fig 1:Views of cameras Fig 2:Teleimmersedenvironment III. HOW TELEIMMERSION WORKS The apparatus consists of:• desk surface (stereo immersive desk)• two wall surfaces• two oblique front stereo projection sources(might be integrated with projectors)As illustrated (in fig 3) thethree display surfaces meet each other in the corner to make a desk. At themoment four tele-cubicles can be joined to form a large virtually shared space.
The walls appear to be transparent passage for other cubicles during thislinkage, and the desk surfaces join to form a large table in the middle.Objects at each place can be shared for viewing across the common desk andthrough walls can be seen the colleagues at other end and their environment. Fig 3. Working of tele cubicleThe hectic efforts in thisregard initiated a project called Office of the Future. In this project theideas which were discussed in the July, 1997 meeting coined together. Theapproach was to use the advanced techniques in computer vision field to capturethe visible objects in the office like furniture, people, etc. The captureimages were then reconstruct and transmitted over the network to the otherremote site for display.
In thissimplified scheme for how a future teleimmersion scheme might work, twopartners separated by 1,000 miles collaborate on a new engine design.Following the flow of informationteleimmersion depends on intense data processing at each end of a connection,mediated by high performance networkA. From the sender: Parallelprocessors accept visual inputs from the cameras and reinterpret the scene as a3-Dimensional computer model. B. To the receiver: Specific rendering of remotepeople and places are synthesized from the model as it is received to match thepoint of view of each eye of a user.
The whole process repeats many times asecond to keep up with the user head motion.C. Generating the 3-D Image: 1.Anarray of cameras views people and their surroundings from different angle .
Each camera generates an image from its point of view many times in a second. Fig 4:Array ofcameras Each set of the images taken at a giveninstant is sorted into subsets of overlapping trios of images.. From each trioof images, a “disparity map” is calculated, reflecting the degree ofvariation among the images at all points in the Disparity map visual field. The disparities are thenanalyzed to yield depths that wouldaccount for the differences between what each camera sees. These depth valuesare combined into a “bas relief” depth map of the scene. All the depth maps are combined into a singleviewpoint independent sculptural model of the scene at a given moment. Process ofcombining the depth maps providemaps opportunities.
Final View for removing spurious points andnoise. IV. teleimmersionand virtual realityA. Reality: Teleimmersionmay sound like virtual reality but there are major differences between the twotechnologies. While virtual reality allows you to move in a computer-generated3-D environment, teleimmersion can only create a 3d environment that you can see but not interact with. However,interaction is possible by combining the two technologies.V.
APPLICATIONS Teleimmersive holographic environment have anumber of applications. video game free of joysticks, friends in a sharedholographic room,Doctors and Soldiers could use teleimmersion to train in a simulated environment, and so on The list ofapplications is large and varied, and one thing is crystal clear- thistechnology will significantly affect the educational, scientific and medicalsectors. · Medicine:· Education · FutureOffice: VI.
CONCLUSIONWhen tele-immersion becomes common place, itwill probably enable a wide variety of important applications.In fact,tele-immersion might come to be seen as real competition for air travel–unlikevideoconferencing. Although few would claim that teleimmersion will beabsolutely as good as “being there” in the near term, it might begood enough for business meetings, professional consultations, trainingsessions, trade show exhibits and the like. Business travel might be replacedto a significant degree by tele-immersion in 10 years.
Undoubtedlytele-immersion will pose new challenges as well.. According to one of theresearchers of Tele- Immersion Team, Defanti, “such technology would enableresearchers to collaborate in fields such as architecture, medicine andastrophysics and airplane design. The beauty of it is that it allows widelyseparated people to share a complex virtual experience. You might be testing avehicle,” says Defanti.
“You want to smash it into the wall at 40miles per hour and put your head by the cylinder block. Say there’s a guy fromSweden and you have to prove to him that it doesn’t move by 3 centimeters ormore. That kind of stuff works.
“In the years to some it will be one of themajor developments. You could visit each other environment, but one thing whichis far behind to achieve is the physical contact of individuals at each end.So it can be summarized as:• Collaboration at geographically distributedsites in real-time• Synthesis of networking and media technologies• Full integration of Virtual Reality into theworkflow VII. REFERENCES1. www.